Patent Publication Number: US-2022235011-A1

Title: Phthalazinone compounds and use thereof

Description:
TECHNICAL FILED 
     The present invention relates to a phthalazinone compound, or a racemate, a stereoisomer or a pharmaceutically acceptable salt thereof; and a pharmaceutical composition comprising the same as an active ingredient for the prevention or treatment of Sirtuin 6 protein (hereinafter, referred to as “Sirt6”)-associated diseases. 
     BACKGROUND ART 
     To date, a total of seven types of sirtuin proteins, Sirt1 to Sirt7, have been identified, and most of them have been reported as being involved in aging, metabolic diseases, and gene stability. It has been found that Sirt6 whole-body knockout mice are normal during fetal development but smaller than the wild type after birth and have lymphopenia, osteopenia, abnormal metabolism, genomic instability, excessive inflammation, or myocardial hypertrophy, and cell-selective Sirt6 knockout mice display phenotypes such as growth retardation, fatty liver, cancer development, hepatocirrhosis/inflammation, and decreased insulin secretion (Proc. Natl. Acad. Sci. USA. 2010, 107, 21790-21794; Cell Metab. 2010, 12, 224-236; Cell 2012, 151, 1185-1199; J. Biol. Chem. 2012, 287, 41903-41913). Based on the results of various animal model studies described above, it was reported that Sirt6 has the functions of DNA damage repair, metabolic homeostatis regulation (glucose metabolism and fat metabolism), inflammatory response regulation, and lifespan-associated mechanism regulation (Nature 2009, 460, 587-591). Sirt6 may be present in cytoplasmic stress granules and endoplasmic reticulum, but is mostly concentrated in the nucleus, particularly chromatin, and is activated by NAD +  cofactors (Sci. Rep. 2013, 3, 3085). 
     H2K9, H3K56, H3K18, and acetyltransferase GCN5 have been known as major target proteins of Sirt6 deacetylase enzyme activity (Curr. Top. Med. Chem. 2013, 13, 2991-3000; Nature 2008, 452,492-496; Cell Cycle 2009, 8, 2664-2666; and Nat. Struct. Mol. Biol. 2016, 23, 434-440). It has been reported that H3K9 and H3K56 associated with the Sirt6 protein regulate the transcriptional expression of specific genes through acetylation/deacetylation and control the stability of specific heterochromatins such as telomeres (Cell 2009, 136, 62-74; Cell, 2010, 140, 280-293), thereby maintaining genome stability, regulating the expression of genes associated with glucose metabolism and fat metabolism, and contributing to telomere stability. Because of the above-described chromatin regulatory functions, Sirt6 deficiency has been reported to induce cancer, fatty liver, myocardial hypertrophy, and premature aging (Curr. Top. Med. Chem. 2013, 13, 2991-3000). 
     Accordingly, it has been expected that a compound having Sirt6 activity or a pharmaceutically acceptable salt thereof can be used for the treatment or prevention of diseases associated with Sirt6 activity. 
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     Technical Problem to be Solved 
     An object of the present invention is to provide a phthalazinone compound exhibiting Sirt6 activity, or a racemate, a stereoisomer or a pharmaceutically acceptable salt thereof. 
     Another object of the present invention is to provide a method for preparing a phthalazinone compound, or a racemate, a stereoisomer or a pharmaceutically acceptable salt thereof. 
     Still another object of the present invention is to provide a pharmaceutical composition for the prevention or treatment of Sirt6-related diseases, comprising a phthalazinone compound exhibiting Sirt6 activity, or a racemate, a stereoisomer or a pharmaceutically acceptable salt thereof. 
     Still another object of the present invention is to provide a method of preventing or treating Sirt6-related diseases, comprising administering the phthalazinone compound, or a racemate, a stereoisomer or a pharmaceutically acceptable salt thereof according to the present invention, to a subject in need thereof. 
     Still another object of the present invention is to provide a pharmaceutical composition, comprising the phthalazinone compound, or a racemate, a stereoisomer or a pharmaceutically acceptable salt thereof according to the present invention; and one or more selected from the group consisting of a carrier, an excipient and a diluent. 
     Technical Solution 
     Technical solutions to achieve the objects of the present invention as described above are as follows: 
     1. A compound represented by the following Formula 1, or a racemate, a stereoisomer or a pharmaceutically acceptable salt thereof: 
     
       
         
         
             
             
         
       
     
     wherein, 
     X is OH or N; 
     R 1  is H, C 1-6  alkyl, or halo selected from the group consisting of fluoro, chloro and bromo; 
     R 2  is selected from the group consisting of C 1-6  alkyl, aryl-substituted C 1-6  alkyl, aryl, heteroaryl, C 3-7  cycloalkyl and heterocyclyl; 
     R 3  is selected from the group consisting of aryl, heteroaryl and heterocyclyl, 
     wherein each of the aryl, heteroaryl, cycloalkyl and heterocyclyl may be substituted with one to three substituents, and when substituted, the substituent thereof is each independently selected from the group consisting of halo selected from the group consisting of fluoro, chloro and bromo, nitro, cyano, hydroxy, oxo, C 1-6  alkyl unsubstituted or substituted with one to three halogen atoms, C 1-6  alkyloxy, aryl, heteroaryl, —NR 4 R 5 , —CH═N + (O − )R 6 , —C(O)R 7 , —SO 2 R 8 , —C(═NOH)NR 9 R 10 , and —CR 9 R 10 R 11 ; 
     R 4  and R 5  are each independently H, C 1-6  alkyl, C 1-6  alkyl substituted with one to three halogen atoms or hydroxy, —SO 2 R 12 , or —C(O)R 15 ; 
     R 6  is C 1-6  alkyl or aryl-substituted C 1-6  alkyl; 
     R 7  is C 1-6  alkyloxy or —NR 16 R 17 ; 
     R 8  is C 1-6  alkyl or —NR 18 R 19 ; 
     R 9  and R 10  are each independently H or C 1-6  alkyl, or R 9  and R 10  are joined with each other to form cycloalkyl together with carbon atom to which they are connected, 
     R 11  is cyano, amino, unsubstituted or amino-substituted C 1-6  alkyl, unsubstituted or C 1-6  alkyl-substituted heteroaryl, heterocyclyl, —CO 2 R 20 , or —C(O)NR 20 R 21 ; 
     R 12  is C 1-6  alkyl, C 1-6  alkyl substituted with one to three halogen atoms, a C 3-6  cycloalkyl, or —NR 13 R 14 ; 
     R 13  and R 14  are each independently H, C 1-6  alkyl or —CO 2 R 15 ; 
     R 15  is C 1-6  alkyl; 
     R 16  and R 17  are each independently H, heterocyclyloxy, or hydroxy; 
     R 18  and R 19  are each independently H or unsubstituted or hydroxy-substituted C 1-6  alkyl, or R 18  and R 19  are joined with each other to form heterocyclyl together with N atom to which they are connected; 
     R 20  is H or C 1-6  alkyl, and R 21  is H, unsubstituted or hydroxy-substituted C 1-6  alkyl, cycloalkyl, aryl, or unsubstituted or C 1-6  alkyl-substituted heteroaryl, or R 20  and R 21  are joined with each other to form heterocyclyl together with N atom to which they are connected; 
     the aryl is C 6-10  aromatic cyclic group; 
     the cycloalkyl is C 3-7  aliphatic cyclic group; 
     the heteroaryl is 5- or 6-membered heteroaromatic cyclic group containing one to four heteroatoms selected from N, O, and S in the cycle; and 
     the heterocyclyl is 4- to 7-membered heterocyclic group including one or two heteroatoms selected from N and O in the cycle. 
     2. A pharmaceutical composition for the prevention or treatment of Sirt6-related diseases, comprising the compound represented by Formula 1 above, or a racemate, a stereoisomer or a pharmaceutically acceptable salt thereof. 
     Advantageous Effects 
     According to the present invention, a novel phthalazinone compound having excellent Sirt6 activity, or a racemate, a stereoisomer or a pharmaceutically acceptable salt thereof is provided. The compound of the present invention, or a racemate, a stereoisomer or a pharmaceutically acceptable salt thereof, has been found to have excellent Sirt6 activity and thus, it is expected to be useful for the prevention or treatment of Sirt6-related diseases. 
     Detailed Description of the Embodiments 
     One aspect of the present invention relates to a compound represented by the following Formula 1, or a racemate, a stereoisomer or a pharmaceutically acceptable salt thereof: 
     
       
         
         
             
             
         
       
     
     wherein, 
     X is CH or N; 
     R 1  is H, C 1-6  alkyl, or halo selected from the group consisting of fluoro, chloro and bromo; 
     R 2  is selected from the group consisting of C 1-6  alkyl, aryl-substituted C 1-6  alkyl, aryl, heteroaryl, C 3-7  cycloalkyl and heterocyclyl; 
     R 3  is selected from the group consisting of aryl, heteroaryl and heterocyclyl, 
     wherein each of the aryl, heteroaryl, cycloalkyl and heterocyclyl may be substituted with one to three substituents, and when substituted, the substituent thereof is each independently selected from the group consisting of halo selected from the group consisting of fluoro, chloro and bromo, nitro, cyano, hydroxy, oxo, C 1-6  alkyl unsubstituted or substituted with one to three halogen atoms, C 1-6  alkyloxy, aryl, heteroaryl, —NR 4 R 5 , —CH═N + (O − )R 6 , —C(O)R 7 , —SO 2 R 8 , —C(═NOH)NR 9 R 10 , and —CR 9 R 10 R 11 ; 
     R 4  and R 5  are each independently H, C 1-6  alkyl, C 1-6  alkyl substituted with one to three halogen atoms or hydroxy, —SO 2 R 12 , or —C(O)R 15 ; 
     R 6  is C 1-6  alkyl or aryl-substituted C 1-6  alkyl; 
     R 7  is C 1-6  alkyloxy or —NR 16 R 17 ; 
     R 8  is C 1-6  alkyl or —NR 18 R 19 ; 
     R 9  and R 10  are each independently H or C 1-6  alkyl, or R 9  and R 10  are joined with each other to form cycloalkyl together with carbon atom to which they are connected, 
     R 11  is cyano, amino, unsubstituted or amino-substituted C 1-6  alkyl, unsubstituted or C 1-6  alkyl-substituted heteroaryl, heterocyclyl, —CO 2 R 20 , or —C(O)NR 20 R 21 ; 
     R 12  is C 1-6  alkyl, C 1-6  alkyl substituted with one to three halogen atoms, a C 3-6  cycloalkyl, or —NR 13 R 14 ; 
     R 13  and R 14  are each independently H, C 1-6  alkyl or —CO 2 R 15 ; 
     R 15  is C 1-6  alkyl; 
     R 16  and R 17  are each independently H, heterocyclyloxy, or hydroxy; 
     R 18  and R 19  are each independently H or unsubstituted or hydroxy-substituted C 1-6  alkyl, or R 18  and R 19  are joined with each other to form heterocyclyl together with nitrogen (N) atom to which they are connected; 
     R 20  is H or C 1-6  alkyl, and R 21  is H, unsubstituted or hydroxy-substituted C 1-6  alkyl, cycloalkyl, aryl, or unsubstituted or C 1-6  alkyl-substituted heteroaryl, or R 20  and R 21  are joined with each other to form heterocyclyl together with N atom to which they are connected; and 
     the aryl is C 6-10  aromatic cyclic group, the cycloalkyl is C 3-7  aliphatic cyclic group, the heteroaryl is 5- or 6-membered heteroaromatic cyclic group including one to four heteroatoms selected from N, O, and S in the cycle, and the heterocyclyl is 4- to 7-membered heterocyclic group including one or two heteroatoms selected from N and O in the cycle, and they may optionally have one or two double bonds in the ring. 
     According to one specific embodiment of the present invention, the R 2  is C 1-6  alkyl; C 6-10  aryl-substituted C 1-6  alkyl; unsubstituted C 6-10  aryl; C 6-10  aryl substituted with one or two substituents selected from the group consisting of C 1-6  alkyl, fluoro-substituted C 1-6  alkyl, C 1-6  alkyloxy, fluoro, chloro and bromo; unsubstituted C 3-7  cycloalkyl; C 3-7  cycloalkyl substituted with one or two substituents selected from the group consisting of fluoro, chloro, bromo and C 1-6  alkyl; unsubstituted heteroaryl; or C 1-6  alkyl-substituted heteroaryl. 
     According to another specific embodiment of the present invention, the R 3  is aryl substituted with a substituent selected from the group consisting of halo selected from the group consisting of fluoro, chloro and bromo; nitro; cyano; C 1-6  alkyl unsubstituted or substituted with one to three halogen atoms; C 1-6  alkyloxy; aryl; and heteroaryl. 
     According to still another specific embodiment of the present invention, the R 3  may be aryl further substituted with a substituent selected from the group consisting of —NR 4 R 5 , —CH═N + (O − )R 6 , —C(O)R 7 , —SO 2 R 8 , —C(═NOH)NR 9 R 10  and —CR 9 R 10 R 11 . 
     According to yet another specific embodiment of the present invention, when the R 3  is aryl further substituted with —NR 4 R 5 , R 4  is H, C 1-6  alkyl or C 1-6  alkylsulfonyl, and R 5  is H, unsubstituted or hydroxy-substituted C 1-6  alkyl, —C(O)R 15  or —SO 2 R 12 , wherein R 12  is C 1-6  alkyl, fluoro-substituted C 1-6  alkyl, a C 3-6  cycloalkyl or —NR 13 R 14 , R 13  and R 14  are each independently H, C 1-6  alkyl or —CO 2 R 15 , and R 15  is —C 1-6  alkyl. 
     According to yet another specific embodiment of the present invention, when the R 3  is aryl further substituted with —CH═N + (O − )R 6 , R 6  is C 1-6  alkyl or aryl-substituted C 1-6  alkyl. 
     According to yet another specific embodiment of the present invention, when the R 3  is aryl further substituted with —C(O)R 7 , R 7  is —NR 16 R 17 , wherein R 16  is H, and R 17  is H, heterocyclyloxy or hydroxy. 
     According to yet another specific embodiment of the present invention, when the R 3  is aryl further substituted with —SO 2 R 8 , R 8  is —NR 18 R 19 , wherein R 18  is H or C 1-6  alkyl, and R 19  is H, C 1-6  alkyl or hydroxy-substituted C 1-6  alkyl, or R 18  and R 19  may be joined with each other to form heterocyclyl together with N atom to which they are connected. 
     According to yet another specific embodiment of the present invention, when the R 3  is aryl further substituted with —C(═NOH)NR 9 R 10 , each of R 9  and R 10  is H. 
     According to yet another specific embodiment of the present invention, when the R 3  is aryl further substituted with —CR 9 R 10 R 11 , each of R 9  and R 10  is H or C 1-6  alkyl, or R 9  and R 10  may be joined with each other to form cycloalkyl together with carbon atom to which they are connected, and R 11  is cyano, amino, unsubstituted or C 1-6  alkyl-substituted heteroaryl, heterocyclyl, —CO 2 R 20  or —C(O)NR 20 R 21 , wherein R 20  is H or C 1-6  alkyl, R 21  is H, unsubstituted or hydroxy-substituted C 1-6  alkyl, cycloalkyl, aryl, or unsubstituted or C 1-6  alkyl-substituted heteroaryl, or R 20  and R 21  may be joined with each other to form heterocyclyl together with N atom to which they are connected. 
     According to yet another specific embodiment of the present invention, the aryl is phenyl or naphthyl. 
     According to yet another specific embodiment of the present invention, the heteroaryl is selected from the group consisting of pyrrolyl, pyrazolyl, imidazolyl, tetrazolyl, oxazolyl, thienyl, isoxazolyl, thiazolyl, isothiazolyl, thiadiazolyl, oxadiazolyl, furanyl, thiophenyl, pyridinyl, pyridazinyl, pyrimidyl, triazinyl, pyrazinyl and pyridine-N-oxide. 
     According to yet another specific embodiment of the present invention, the heterocyclyl is selected from the group consisting of tetrahydropyranyl, tetrahydrofuranyl, dihydrofuranyl, dihydropyranyl, tetrahydropyridinyl, dioxanyl, dithianyl, dioxolanyl, imidazolidinyl, imidazolinyl, pyrrolinyl, piperazinyl, morpholinyl, thiomorpholinyl, piperidinyl, oxetanyl, pyrrolidinyl and azepanyl. 
     In the present invention, specific examples of the compound of Formula 1 include the following compounds:
     1) N-(3-(4-Oxo-3-phenyl-3,4-dihydrophthalazin-1-yl)phenyl)ethanesulfonamide;   2) 4-(3-Aminophenyl)-2-(4-(trifluoromethyl)phenyl)phthalazin-1(2H)-one;   3) N-(3-(4-Oxo-3-(4-(trifluoromethyl)phenyl)-3,4-dihydrophthalazin-1-yl)phenyl)ethanesulfonamide;   4) 4-(3-(Ethylamino)phenyl)-2-(4-(trifluoromethyl)phenyl)phthalazin-1(2H)-one;   5) N-Methyl-N-(3-(4-oxo-3-(4-(trifluoromethyl)phenyl)-3,4-dihydrophthalazin-1-yl)phenyl)ethanesulfonamide;   6) N-(3-(4-Oxo-3-phenyl-3,4-dihydrophthalazin-1-yl)phenyl)methanesulfonamide;   7) N-Methyl-N-(3-(4-oxo-3-phenyl-3,4-dihydrophthalazin-1-yl)phenyl)methanesulfonamide;   8) N-(4-(4-Oxo-3-phenyl-3,4-dihydrophthalazin-1-yl)phenyl)ethanesulfonamide;   9) N-(3-(3-Phenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)dimethylsulfamoylamide;   10) N-(3-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)methanesulfonamide;   11) N-(3-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)ethanesulfonamide;   12) N-(3-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)dimethylsulfamoylamide;   13) (Z)—N-Methyl-1-(3-(4-oxo-3-phenyl-3,4-dihydrophthalazin-1-yl)phenyl)methanimine oxide;   14) (Z)—N-Isopropyl-1-(3-(4-oxo-3-phenyl-3,4-dihydrophthalazin-1-yl)phenyl)methanimine oxide;   15) (Z)-1-(3-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-methylmethanimine oxide;   16) (Z)—N-Ethyl-1-(3-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)methanimine oxide;   17) (Z)-1-(3-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-isopropylmethanimine oxide;   18) N-(2-Chloro-5-(4-oxo-3-phenyl-3,4-dihydrophthalazin-1-yl)phenyl)-N-(methylsulfonyl)methanesulfon amide;   19) N-(3-(3-(Phenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)-6-chlorophenyl)dimethylsulfamoylamide;   20) Methyl (N-(3-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)sulfamoyl)carbamate;   21) (Z)-1-(3-(3-(2,4-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-methylmethanimine oxide;   22) (Z)-1-(3-(3-(2,4-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-isopropylmethanimine oxide;   23) (Z)—N-tert-Butyl-1-(3-(3-(2,4-difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)methanimine oxide;   24) 4-(3-Aminophenyl)-2-(2,4-difluorophenyl)phthalazin-1(2H)-one;   25) N-(3-(3-(2,4-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)ethanesulfonamide;   26) Methyl (N-(3-(3-(2,4-difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)sulfamoyl)carbamate;   27) (Z)-1-(3-(3-(3-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-methylmethanimine oxide;   28) (Z)-1-(3-(3-(3-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-isopropylmethanimine oxide;   29) (Z)—N-tert-Butyl-1-(3-(3-(3-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)methanimine oxide;   30) N-(3-(3-(3-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)ethanesulfonamide;   31) (Z)-1-(3-(3-(3,5-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-isopropylmethanimine oxide;   32) (Z)—N-Isopropyl-1-(3-(3-(4-methoxyphenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)methanimine oxide;   33) (Z)-1-(3-(3-(3-Chloro-4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-isopropylmethanimine oxide;   34) (Z)—N-tert-Butyl-1-(3-(3-(3-chloro-4-fluoro phenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)methanimine oxide;   35) (Z)—N-Benzyl-1-(3-(4-oxo-3-phenyl-3,4-dihydrophthalazin-1-yl)phenyl)methanimine oxide;   36) (E)-1-(4-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-methylmethanimine oxide;   37) (Z)-1-(3-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-isopropylmethanimine oxide;   38) (E)-1-(3-Fluoro-4-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-methylmethanimine oxide;   39) (E)-1-(3-Fluoro-4-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-isopropylmethanimine oxide;   40) (Z)-1-(2-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-methylmethanimine oxide;   41) (Z)-1-(2-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-isopropylmethanimine oxide;   42) (Z)—N-tert-Butyl-1-(2-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)methanimine oxide;   43) (Z)—N-tert-Butyl-1-(3-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)methanimine oxide;   44) (Z)—N-Benzyl-1-(3-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)methanimine oxide;   45) (Z)-1-(5-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)thiophen-2-yl)-N-methylmethanimine oxide;   46) (Z)-1-(5-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)thiophen-2-yl)-N-isopropylmethanimine oxide;   47) (Z)—N-tert-Butyl-1-(5-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)thiophen-2-yl)methanimine oxide;   48) (Z)-1-(5-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)furan-2-yl)-N-isopropylmethanimine oxide;   49) (Z)—N-tert-Butyl-1-(5-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)-2-methoxyphenyl)methanimine oxide;   50) (Z)—N-Benzyl-1-(5-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)-2-methoxyphenyl)methanimine oxide;   51) (Z)-1-(2-Fluoro-5-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-methylmethanimine oxide;   52) (Z)-1-(2-Fluoro-5-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-isopropylmethanimine oxide;   53) (Z)—N-tert-Butyl-1-(2-fluoro-5-(3-(4-fluoro phenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)methanimine oxide;   54) (Z)—N-Benzyl-1-(2-fluoro-5-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)methanimine oxide;   55) (Z)-1-(4-Fluoro-3-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-methylmethanimine oxide;   56) (Z)-1-(4-Fluoro-3-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-isopropylmethanimine oxide;   57) (Z)—N-tert-Butyl-1-(4-fluoro-3-(3-(4-fluoro phenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)methanimine oxide;   58) (Z)—N-Benzyl-1-(4-fluoro-3-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)methanimine oxide;   59) 4-(4-Chloro-3-nitrophenyl)-2-(4-fluorophenyl)phthalazin-1(2H)-one;   60) 4-(3-Aminophenyl)-2-(4-fluorophenyl)phthalazin-1(2H)-one;   61) N-(3-(3-Benzyl-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)ethanesulfonamide;   62) N-(3-(4-Oxo-3-phenethyl-3,4-dihydrophthalazin-1-yl)phenyl)ethanesulfonamide;   63) N-(3-(3-(4-Fluorobenzyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)ethanesulfonamide;   64) N-(3-(3-([1,1′-Biphenyl]-4-yl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)ethanesulfonamide;   65) N-(3-(3-([1,1′-Biphenyl]-4-yl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-methylethanesulfonamide;   66) Methyl 3-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)benzoate;   67) N-(3-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)propan-2-sulfonamide;   68) N-(3-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)propan-1-sulfonamide;   69) N-(3-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-methylmethanesulfonamide;   70) N-(3-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-methylethanesulfonamide;   71) N-(3-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)cyclopropanesulfonamide;   72) N-(3-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-methylpropan-1-sulfonamide;   73) N-(3-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-methylpropan-2-sulfonamide;   74) N-(3-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-methylcyclopropanesulfonamide;   75) N-(3-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-methyl-dimethylsulfamoylamide;   76) Methyl (N-(3-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-methylsulfamoyl)(methyl) carbamate;   77) 1,1,1-Trifluoro-N-(3-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)methanesulfonamide;   78) 1,1,1-Trifluoro-N-(3-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-methylmethane sulfonamide;   79) 3-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)-N-((tetrahydro-2H-pyran-2-yl)oxy)benzamide;   80) N-(3-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-methyl-methylsulfamoylamide;   81) 4-(3-(1H-Tetrazol-5-yl)phenyl)-2-(4-fluorophenyl)phthalazin-1(2H)-one;   82) N-(5-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)pyridin-3-yl)ethanesulfonamide;   83) 3-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)-N-hydroxybenzamide;   84) (Z)-1-(3-(3-([1,1′-Biphenyl]-4-yl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-methylmethanimine oxide;   85) (Z)-1-(3-(3-([1,1′-Biphenyl]-4-yl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-isopropylmethanimine oxide;   86) 3-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)-N-methylbenzenesulfonamide;   87) N-Ethyl-3-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)benzenesulfonamide;   88) 3-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)-N,N-dimethylbenzenesulfonamide;   89) 2-(2,4-Difluorophenyl)-4-(3-(methylsulfonyl)phenyl)phthalazin-1(2H)-one;   90) 2-(2,4-Difluorophenyl)-4-(3-(ethylsulfonyl)phenyl)phthalazin-1(2H)-one;   91) 3-(3-(2,4-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)-N-methylbenzenesulfonamide;   92) 3-(3-(2,4-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)-N-ethylbenzenesulfonamide;   93) 3-(3-(2,4-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)-N,N-dimethylbenzenesulfonamide;   94) (Z)-1-(3-(3-(2-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-methylmethanimine oxide;   95) (Z)-1-(3-(3-(2-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-isopropylmethanimine oxide;   96) (Z)—N-tert-Butyl-1-(3-(3-(2-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)methanimine oxide;   97) 2-(2-Fluorophenyl)-4-(3-(methylsulfonyl)phenyl)phthalazin-1(2H)-one;   98) 4-(3-(Ethylsulfonyl)phenyl)-2-(2-fluorophenyl)phthalazin-1(2H)-one;   99) 3-(3-(2-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)-N-methylbenzenesulfonamide;   100) N-Ethyl-3-(3-(2-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)benzenesulfonamide;   101) 3-(3-(2-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)-N,N-dimethylbenzenesulfonamide;   102) (Z)-1-(3-(3-(2,6-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-methylmethanimine oxide;   103) (Z)-1-(3-(3-(2,6-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-isopropylmethanimine oxide;   104) (Z)—N-tert-Butyl-1-(3-(3-(2,6-difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)methanimine oxide;   105) 2-(2,6-Difluorophenyl)-4-(3-(methylsulfonyl)phenyl)phthalazin-1(2H)-one;   106) 2-(2,6-Difluorophenyl)-4-(3-(ethylsulfonyl)phenyl)phthalazin-1(2H)-one;   107) 3-(3-(2,6-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)-N-methylbenzenesulfonamide;   108) 3-(3-(2,6-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)-N-ethylbenzenesulfonamide;   109) 3-(3-(2,6-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)-N,N-dimethylbenzenesulfonamide;   110) 6-Fluoro-4-(3-(methylsulfonyl)phenyl)-2-phenyl phthalazin-1(2H)-one;   111) 3-(7-Fluoro-4-oxo-3-phenyl-3,4-dihydrophthalazin-1-yl)-N-methylbenzenesulfonamide;   112) 7-Fluoro-4-(3-(methylsulfonyl)phenyl)-2-phenyl phthalazin-1(2H)-one;   113) 3-(6-Fluoro-4-oxo-3-phenyl-3,4-dihydrophthalazin-1-yl)-N-methylbenzenesulfonamide;   114) 3-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl) pyridine 1-oxide;   115) 2-(2,4-Difluorophenyl)-4-(pyridin-3-yl)phthalazin-1(2H)-one;   116) 2-(2,6-Difluorophenyl)-4-(pyridin-3-yl)phthalazin-1(2H)-one;   117) 3-(3-(2,4-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl) pyridine 1-oxide;   118) 3-(3-(2,6-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl) pyridine 1-oxide;   119) 2-(2,4-Difluorophenyl)-6-fluoro-4-(3-(methyl sulfonyl)phenyl)phthalazin-1(2H)-one;   120) 2-(2,4-Difluorophenyl)-7-fluoro-4-(3-(methyl sulfonyl)phenyl)phthalazin-1(2H)-one;   121) 3-(3-(2,4-Difluorophenyl)-7-fluoro-4-oxo-3,4-dihydrophthalazin-1-yl)-N-methylbenzenesulfonamide;   122) 3-(3-(2,4-Difluorophenyl)-6-fluoro-4-oxo-3,4-dihydrophthalazin-1-yl)-N-methylbenzenesulfonamide;   123) 2-(2,4-Difluorophenyl)-4-(3-(ethylsulfonyl)phenyl)-6-fluorophthalazin-1(2H)-one;   124) 3-(3-(2,4-Difluorophenyl)-7-fluoro-4-oxo-3,4-dihydrophthalazin-1-yl)-N-ethylbenzenesulfonamide;   125) 3-(3-(2,4-Difluorophenyl)-7-fluoro-4-oxo-3,4-dihydrophthalazin-1-yl)-N,N-dimethylbenzenesulfonamide;   126) 3-(3-(2,4-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)benzenesulfonamide;   127) 3-(3-(2,4-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)-N-(2-hydroxyethyl)benzenesulfonamide;   128) N-(3-(3-Cyclohexyl-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)ethanesulfonamide;   129) N-(3-(3-(1-Methylpiperidin-4-yl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)ethanesulfonamide;   130) 3-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)benzonitrile;   131) (E)-3-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)-N′-hydroxybenzimidamide;   132) N-(3-(3-Isopropyl-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)ethanesulfonamide;   133) N-(3-(3-(1-Methyl-1H-pyrazol-4-yl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)ethanesulfonamide;   134) 4-(3-Aminopiperidin-1-yl)-2-(4-fluorophenyl)phthalazin-1 (2H)-one-hydrochloride;   135) N-(1-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)piperidin-3-yl)ethanesulfonamide;   136) N-(3-(3-(Oxetan-3-yl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)ethanesulfonamide;   137) N-(1-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)pyrrolidin-3-yl)ethanesulfonamide;   138) (S)—N-(1-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)piperidin-3-yl)ethanesulfonamide;   139) (R)—N-(1-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)piperidin-3-yl)ethanesulfonamide;   140) N-(3-(3-(4,4-Difluorocyclohexyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)ethanesulfonamide;   141) N-(1-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)azepan-3-yl)ethanesulfonamide;   142) 3-(3-Cyclohexyl-4-oxo-3,4-dihydrophthalazin-1-yl)benzenesulfonamide;   143) 4-(3-Aminoazepan-1-yl)-2-cyclohexylphthalazin-1(2H)-one-hydrochloride;   144) N-(1-(3-Cyclohexyl-4-oxo-3,4-dihydrophthalazin-1-yl)azepan-3-yl)ethanesulfonamide;   145) N-(3-(3-(4-Methylcyclohexyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)ethanesulfonamide;   146) (S)-4-(3-Aminopiperidin-1-yl)-2-cyclohexyl phthalazin-1(2H)-one-hydrochloride;   147) (S)—N-(1-(3-Cyclohexyl-4-oxo-3,4-dihydrophthalazin-1-yl)piperidin-3-yl)ethanesulfonamide;   148) 4-(3-Aminoazepan-1-yl)-2-(4-fluorophenyl)phthalazin-1 (2H)-one-hydrochloride;   149) N-(3-(2-(4-Fluorophenyl)-1-oxo-1,2-dihydropyrido [3,4-d]pyridin-4-yl)phenyl)ethanesulfonamide;   150) N-(3-(3-(4-Fluorophenyl)-8-methyl-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)ethanesulfonamide;   151) N-(3-(4-Oxo-3-(tetrahydro-2H-pyran-4-yl)-3,4-dihydrophthalazin-1-yl)phenyl)ethanesulfonamide;   152) 2-(3-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-2-methylpropanoic acid;   153) 2-(3-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N,2-dimethylpropanamide;   154) 2-Cyclohexyl-4-(3-(methylsulfonyl)phenyl)phthalazin-1(2H)-one;   155) (S)-4-(3-Aminoazepan-1-yl)-2-cyclohexyl phthalazin-1(2H)-one-hydrochloride;   156) (S)-2-Cyclohexyl-4-(3-(methylamino)azepan-1-yl)phthalazin-1 (2H)-one-hydrochloride;   157) (S)-4-(3-Aminoazepan-1-yl)-2-(2,4-difluorophenyl)phthalazin-1 (2H)-one-hydrochloride;   158) (S)-4-(3-Aminoazepan-1-yl)-2-(4-fluorophenyl)phthalazin-1 (2H)-one-hydrochloride;   159) (R)-4-(3-Aminoazepan-1-yl)-2-cyclohexyl phthalazin-1(2H)-one-hydrochloride;   160) 2-(3-(3-Cyclohexyl-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-2-methylpropanoic acid;   161) 3-(3-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)oxazolidin-2-one;   162) (R)-4-(3-Aminoazepan-1-yl)-2-(4-fluorophenyl)phthalazin-1 (2H)-one-hydrochloride;   163) 2-(3-(3-Cyclohexyl-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-2-methylpropanamide;   164) 2-(3-(3-Cyclohexyl-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N,2-dimethylpropanamide;   165) (R)-4-(3-Aminoazepan-1-yl)-2-(2,4-difluorophenyl)phthalazin-1 (2H)-one-hydrochloride;   166) 2-(3-(3-(2,4-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-2-methylpropanoic acid;   167) 4-(3-Aminoazepan-1-yl)-2-(2,4-difluorophenyl)phthalazin-1 (2H)-one-hydrochloride;   168) 2-(3-(3-(2,4-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-2-methylpropanenitrile;   169) 4-(3-(2-(1H-Tetrazol-5-yl)propan-2-yl)phenyl)-2-(2,4-difluorophenyl)phthalazin-1(2H)-one;   170) (E)-2-(3-(3-(2,4-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N′-hydroxy-2-methylpropanimideamide;   171) 2-(3-(3-(2-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-2-methylpropanoic acid;   172) 4-(3-Aminoazepan-1-yl)-2-cyclobutylphthalazin-1(2H)-one-hydrochloride;   173) 4-(3-Aminoazepan-1-yl)-2-cyclopentylphthalazin-1(2H)-one-hydrochloride;   174) 2-(2,4-Difluorophenyl)-4-(3-(2-(5-methyl-1,2,4-oxadiazol-3-yl)propan-2-yl)phenyl)phthalazin-1(2H)-one;   175) (R)-4-(3-Aminoazepan-1-yl)-2-(2-fluorophenyl)phthalazin-1 (2H)-one-hydrochloride;   176) 2-(3-(3-(2,4-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-isopropyl-2-methylpropanamide;   177) 2-(2,4-Difluorophenyl)-4-(3-(2-methyl-1-oxo-1-(pyrrolidin-1-yl)propan-2-yl)phenyl)phthalazin-1(2H)-one;   178) N-Cyclopropyl-2-(3-(3-(2,4-difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-2-methylpropanamide;   179) 2-(2,4-Difluorophenyl)-4-(3-(2-methyl-1-morpholino-1-oxopropan-2-yl)phenyl)phthalazin-1(2H)-one;   180) N-Cyclohexyl-2-(3-(3-(2,4-difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-2-methylpropanamide;   181) N-Cyclohexyl-2-(3-(3-(2,4-difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-2-methylpropanamide;   182) 2-(3-(3-(2,4-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-2-methyl-N-(1-methyl-1H-pyrazol-4-yl)propanamide;   183) 1-(3-(3-(2,4-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)cyclopropan-1-carboxylic acid;   184) 4-(1,4-Diazepan-1-yl)-2-(2,4-difluorophenyl)phthalazin-1 (2H)-one-hydrochloride;   185) (R)-4-(3-Aminoazepan-1-yl)-2-(4-chlorophenyl)phthalazin-1 (2H)-one-hydrochloride;   186) 2-(3-(3-(2,4-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-(2-hydroxyethyl)-2-methyl propanamide;   187) (R)—N-(1-(3-(2,4-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)azepan-3-yl)ethanesulfonamide;   188) 2-(3-(3-(2,4-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-2-methylpropanamide;   189) (R)-2-(2,4-Difluorophenyl)-4-(3-(methylamino) azepan-1-yl)phthalazin-1(2H)-one-hydrochloride;   190) (R)-2-(2,4-difluorophenyl)-4-(3-(methylamino) azepan-1-yl)phthalazin-1 (2H)-one-hydrochloride;   191) (R)-2-(2,4-Difluorophenyl)-4-(3-((2-hydroxyethyl) amino)azepan-1-yl)phthalazin-1(2H)-one-hydrochloride;   192) (R)—N-(1-(3-(2,4-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)azepan-3-yl)acetamide;   193) 2-(2,4-Difluorophenyl)-4-(3-oxoazepan-1-yl)phthalazin-1(2H)-one;   194) 2-(3-(3-(4-Chlorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-2-methylpropanoic acid;   195) 1-(3-(3-(4-Chlorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)cyclopropan-1-carboxylic acid;   196) 2-(4-Chlorophenyl)-4-(3-hydroxyazepan-1-yl)phthalazin-1(2H)-one;   197) 2-(3-(3-(4-Chlorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-2-methylpropanamide;   198) 1-(3-(3-(4-Chlorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)cyclopropan-1-carboxyamide;   199) 2-(3-(3-(2,4-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)acetic acid;   200) 4-(3-(2-Aminopropan-2-yl)phenyl)-2-(2,4-difluoro phenyl)phthalazin-1(2H)-one-hydrochloride;   201) 2-(3-(3-(4-Chloro-2-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-2-methylpropanoic acid;   202) (R)-4-(3-Aminoazepan-1-yl)-2-(4-chloro-2-fluoro phenyl)phthalazin-1-(2H)-one-hydrochloride;   203) 1-(3-(4-Chloro-2-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)azepane-3-carbonitrile;   204) 4-(3-(1-Amino-2-methylpropan-2-yl)phenyl)-2-(2,4-difluorophenyl)phthalazin-1(2H)-one-hydrochloride;   205) 2-(1-(3-(2,4-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)piperidin-3-yl)-2-methylpropanoic acid;   206) 2-(3-(3-(4-Cyclopropylphenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-2-methylpropanoic acid;   207) 1-(3-(3-(2,4-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)cyclobutane-1-carboxylic acid;   208) 1-(3-(3-(2,4-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)cyclobutane-1-carboxylic acid;   209) 2-(1-(3-(4-Chlorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)piperidin-3-yl)-2-methylpropanoic acid;   210-1 and 210-2) 2-(1-(3-(2,4-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)piperidin-3-yl)-2-methyl propanoic acid;   211) Methyl 1-(1-(3-(2,4-difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)piperidin-3-yl)cyclopropan-1-carboxylate;   212) 1-(1-(3-(2,4-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)piperidin-3-yl)cyclopropan-1-carboxylic acid;   213-1 and 213-2) 1-(1-(3-(2,4-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)piperidin-3-yl)cyclopropan-1-carboxylic acid;   214) 2-(2,4-Difluorophenyl)-4-(3-(pyrrolidin-1-ylsulfonyl)phenyl)phthalazin-1 (2H)-one;   215) 2-(2,4-Difluorophenyl)-4-(1,2,3,6-tetrahydro pyridin-4-yl)phthalazin-1(2H)-one-hydrochloride;   216) 3-(3-(2,4-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)-N-ethyl-N-methylbenzenesulfonamide;   217) 3-(3-(2,4-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)-N, N-diethylbenzenesulfonamide;   218) 2-(2,4-Difluorophenyl)-4-(1-(ethylsulfonyl)-1,2,3,6-tetrahydropyridin-4-yl)phthalazin-1(2H)-one;   219) 2-(4-(3-(2,4-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)piperazin-2-yl)-2-methylpropanoic acid;   220) 2-(4-(3-(2,4-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)-1-methylpiperazin-2-yl)-2-methylpropanoic acid, and   221) 2-(4-(3-(2,4-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)morpholin-2-yl)-2-methylpropanoic acid.   

     The compound of Formula 1 of the present invention may be provided in the form of a pharmaceutically acceptable salt. 
     Examples of the pharmaceutically acceptable salt may include an acid addition salt formed with a pharmaceutically acceptable free acid. The term “pharmaceutically acceptable salt” refers to an acid addition salt of the compound of Formula 1 in which any side effects do not reduce the efficacy of the compound at a concentration having an effective action that is relatively non-toxic and harmless to a patient. Herein, the acid may be an organic acid or an inorganic acid. Examples of the inorganic acid include, but are not limited thereto, hydrochloric acid, phosphoric acid, sulfuric acid, nitric acid and the like, and examples of the organic acid include, but are not limited thereto, methanesulfonic acid, p-toluenesulfonic acid, acetic acid, trifluoroacetic acid, maleic acid, succinic acid, oxalic acid, benzoic acid, tartaric acid, fumaric acid, manderic acid, propanoic acid, citric acid, lactic acid, glycolic acid, gluconic acid, galacturonic acid, glutamic acid, glutaric acid, glucuronic acid, aspartic acid, ascorbic acid, carbonic acid, vanillic acid, hydroiodic acid and the like. 
     Other examples of the pharmaceutically acceptable salt may include a metal salt prepared with a base. Examples of the metal salt include sodium salt, potassium salt, calcium salt and the like, of which calcium salt is particularly pharmaceutically appropriate, but are not limited thereto. In addition, the metal salt may also be provided in the form of a silver salt obtained by reacting an alkali metal salt or alkaline earth metal salt with an appropriate silver salt (e.g., silver nitrate). 
     Since the above-described salts are only examples, any pharmaceutically acceptable salt may be used as the salt of the compound of Formula 1 without limitation as long as it has about the same level of Sirt6 activity as the compound of Formula 1. 
     Another aspect of the present invention relates to a pharmaceutical composition for the prevention or treatment of Sirt6-related diseases, comprising the compound of Formula 1, or a racemate, a stereoisomer or a pharmaceutically acceptable salt thereof, and a method of treating Sirt6-related diseases using the compound of Formula 1, or a racemate, a stereoisomer or a pharmaceutically acceptable salt thereof. 
     Since the compound of Formula 1 of the present invention, or a racemate, a stereoisomer or a pharmaceutically acceptable salt thereof, exhibits Sirt6 activity, it can be useful for the prevention or treatment of Sirt6-related diseases. In the present invention, examples of the above-described Sirt6-related diseases may include cancer, fatty liver, hepatocirrhosis/inflammation, decreased insulin secretion and diseases caused by aging, but are not limited to specific diseases, and include all diseases known as being associated with Sirt6 activities. 
     In the present invention, the term “prevention” refers to any action that inhibits or delays the occurrence, spread, and recurrence of a Sirt6-related disease by administering a composition of the present invention, and the term “treatment” refers to any action that improves or beneficially changes symptoms of the disease by administering a composition of the present invention. 
     Still another aspect of the present invention provides a method of preventing or treating Sirt6-related diseases, which includes administering a compound represented by Formula 1, or a racemate, a stereoisomer or a pharmaceutically acceptable salt thereof, to a subject in need thereof. 
     A pharmaceutical composition of the present invention may further comprise, in addition to the compound of Formula 1, or a racemate, a stereoisomer or a pharmaceutically acceptable salt thereof as an active ingredient, known drugs used for the prevention or treatment of each type of disease to be prevented or treated. For example, when used for the prevention or treatment of a Sirt6-related disease, the pharmaceutical composition may further comprise a known additive commonly used in the field of the present invention, for example, any one of a pharmaceutically acceptable carrier, an excipient and a diluent, in addition to the compound of Formula 1, or a racemate, a stereoisomer or a pharmaceutically acceptable salt thereof as an active ingredient, and the pharmaceutical composition may be used in combination with other treatments known to treat the disease. Examples of other treatments include chemotherapy, radiation therapy, hormone therapy, bone marrow transplantation, stem-cell replacement therapy, other biological therapies, and immunotherapy, but the present invention is not limited thereto. 
     EXAMPLES 
     Hereinafter, the present invention will be described in more detail through Preparation Examples and Examples. However, these examples are merely illustrative of the present invention, and the scope of the present invention is not limited by these examples. 
     Preparation Example 1: Preparation of Compound I-1 to Compound I-8 
     Preparation Example 1-1. Preparation of 2-([1,1′-biphenyl]-4-yl)-4-chlorophthalazin-1(2H)-one (I-1) 
     Dichloromethane (DCM; 60 mL), phenylboronic acid (1.10 g, 9.00 mmol), copper acetate (3.24 g, 17.94 mmol) and pyridine (2.40 mL, 29.88 mmol) were added to 4-chlorophthalazin-1(2H)-one (1.08 g, 6.00 mmol) and then stirred at room temperature for 24 hours. After confirming The reaction mixture by thin-layer chromatography (TLC), the reaction solution was diluted with DCM and washed with purified water. Organic layer was dehydrated over anhydrous Na 2 SO 4 , concentrated under reduced pressure, and then reaction product was separated by column chromatography, to obtain 363 mg of the title compound. 
     C-MS (ESI, m/z)=257.1 (M+H + ) 
     Preparation Example 1-2. Preparation of 4-chloro-2-(4-fluorophenyl)phthalazin-1(2H)-one (I-2) 
     4-Chlorophthalazin-1(2H)-one (1.08 g, 6.00 mmol) and 4-fluorophenylboronic acid (0.92 g, 6.58 mmol) were reacted in the same manner as in Preparation Example 1-1, to obtain 401 mg of the title compound. 
     LC-MS (ESI, m/z)=274.9 (M+H + ) 
     Preparation Example 1-3. Preparation of 4-chloro-2-(4-trifluoromethyl)phenyl)phthalazin-1(2H)-one (I-3) 
     4-Chlorophthalazin-1(2H)-one (1.08 g, 6.00 mmol) and 4-(trifluoromethyl)phenylboronic acid (1.25 g, 6.58 mmol) were reacted in the same manner as in Preparation Example 1-1, to obtain 217 mg of the title compound. 
     LC-MS (ESI, m/z)=325.0 (M+H + ) 
     Preparation Example 1-4. Preparation of 4-chloro-2-(4-methoxyphenyl)phthalazin-1(2H)-one (I-4) 
     4-Chlorophthalazin-1(2H)-one (1.08 g, 6.00 mmol) and 4-methoxyphenylboronic acid (1.00 g, 6.58 mmol) were reacted in the same manner as in Preparation Example 1-1, to obtain 432 mg of the title compound. 
     LC-MS (ESI, m/z)=287.1 (M+H + ) 
     Preparation Example 1-5. Preparation of 4-chloro-2-(2-fluorophenyl)phthalazin-1(2H)-one (I-5) 
     4-Chlorophthalazin-1(2H)-one (1.08 g, 6.00 mmol) and 2-fluorophenylboronic acid (0.92 g, 6.58 mmol) were reacted in the same manner as in Preparation Example 1-1, to obtain 345 mg of the title compound. 
     LC-MS (ESI, m/z)=274.9 (M+H + ) 
     Preparation Example 1-6. Preparation of 4-chloro-2-(3-fluorophenyl)phthalazin-1(2H)-one (I-6) 
     4-Chlorophthalazin-1(2H)-one (1.08 g, 6.00 mmol) and 3-fluorophenylboronic acid (0.92 g, 6.58 mmol) were reacted in the same manner as in Preparation Example 1-1, to obtain 381 mg of the title compound. 
     LC-MS (ESI, m/z)=274.9 (M+H + ) 
     Preparation Example 1-7. Preparation of 4-chloro-2-(3,5-difluorophenyl)phthalazin-1(2H)-one (I-7) 
     4-Chlorophthalazin-1(2H)-one (1.08 g, 6.00 mmol) and 3,5-difluorophenylboronic acid (1.04 g, 6.58 mmol) were reacted in the same manner as in Preparation Example 1-1, to obtain 410 mg of the title compound. 
     LC-MS (ESI, m/z)=293.2 (M+H + ) 
     Preparation Example 1-8. Preparation of 4-chloro-2-(3-chloro-4-fluorophenyl)phthalazin-1(2H)-one (I-8) 
     4-Chlorophthalazin-1(2H)-one (1.08 g, 6.00 mmol) and (3-chloro-4-fluorophenyl)boronic acid (1.15 g, 6.58 mmol) were reacted in the same manner as in Preparation Example 1-1, to obtain 388 mg of the title compound. 
     LC-MS (ESI, m/z)=308.8 (M+H + ) 
     Preparation Example 2: Preparation of Compound I-9 and Compound I-10 
     Preparation Example 2-1. Preparation of 4-oxo-3-(2-(trifluoromethyl)phenyl)-3,4-dihydrophthalazin-1-yl trifluoromethanesulfonate (I-9) 
     Step 1: Phthalic anhydride (5 g, 33.76 mmol) and 2,4-difluorophenylhydrazine hydrochloride (6.70 g, 37.13 mmol) were added to acetic acid (50 mL) and then stirred at 120° C. for 24 hours. The reaction solution was allowed to cool to room temperature, and after adding 100 mL of purified water and stirring for one hour, filtering was performed to separate precipitated solid. The obtained solid and NaOH (2.02 g, 50.63 mmol) were diluted in EtOH and then stirred at 40° C. for one or more hours. Subsequently, the reaction solution was concentrated under reduced pressure and diluted in purified water, pH of which was adjusted to 5-6 using 1N HCl. After stirring precipitated crystals for 10 or more minutes, filtering was performed, to obtain 5.1 g of 2-(2,4-difluorophenyl)-2,3-dihydrophthalazine-1,4-dione. 
     LC-MS (ESI, m/z)=275.3 (M+H + ) 
     Step 2: DCM (250 mL) and trimethylamine (3.05 mL, 21.88 mmol) were added to the compound (2.50 g, 9.12 mmol) obtained in Step 1. Subsequently, the resultant was cooled in an ice-salt bath and, after adding trifluoromethanesulfonic acid anhydride (2.30 mL, 13.68 mmol) dropwise, resulting mixture was stirred at room temperature for two hours. The reaction product was diluted with DCM and washed with 2 N HCl, and then organic layer was extracted. The separated organic layer was dehydrated over anhydrous Na 2 SO 4 , concentrated under reduced pressure, and then reaction product was separated by column chromatography, to obtain 1.91 g of the title compound. 
     LC-MS (ESI, m/z)=407.1 (M+H + ) 
     Preparation Example 2-2. Preparation of 3-(2,6-difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl trifluoro-methanesulfonate (I-10) 
     Phthalic anhydride (5.00 g, 33.76 mmol) and 2,6-difluorophenylhydrazine hydrochloride (6.70 g, 37.13 mmol) were reacted in the same manner as in Preparation Example 2-1, to obtain 1.70 g of the title compound. 
     LC-MS (ESI, m/z)=407.0 (M+H + ) 
     Preparation Example 3: Preparation of Compound I-11 to Compound I-14 
     Preparation Example 3-1. Preparation of 4-chloro-6-fluoro-2-phenylphthalazin-1(2H)-one (I-11) and 4-chloro-7-fluoro-2-phenylphthalazin-1(2H)-one (I-12) 
     Step 1: Phenylhydrazine hydrochloride (13 g, 90.36 mmol) and 10% HCl (400 mL) were added to 4-fluorophthalic anhydride (10 g, 60.24 mmol) and then stirred at 110° C. for 24 hours. After confirming The reaction mixture by TLC, the reaction solution was diluted with EtOAc and washed with purified water. Organic layer was dehydrated over anhydrous Na 2 SO 4 , concentrated under reduced pressure, and then reaction product was separated by column chromatography, to obtain intermediate compounds 6-fluoro-2-phenyl-2,3-dihydrophthalazine-1,4-dione (4.70 g, 30.4% yield) and 7-fluoro-2-phenyl-2,3-dihydrophthalazine-1,4-dione (5.1 g, 33.0% yield) were synthesized. 
     Step 2: Phosphoryl chloride (25 mL) was added to the intermediate compounds 6-fluoro-2-phenyl-2,3-dihydrophthalazine-1,4-dione and 7-fluoro-2-phenyl-2,3-dihydrophthalazine-1,4-dione (1.07 g, 4.17 mmol) obtained in Step 1 and then stirred at 120° C. for two hours. The reaction mixture was allowed to cool to room temperature and, after distilling off an excess solvent, put in ice water to recover a solid product. The solid obtained by filtration was dissolved in DCM, neutralized by adding saturated aqueous NaHCO 3 , and extracted with DCM. Organic layer was dehydrated over anhydrous Na 2 SO 4 , concentrated under reduced pressure, and then reaction product was separated by column chromatography, to obtain 550 mg of Compound I-11 and 428 mg of Compound I-12 were obtained. 
     LC-MS (ESI, m/z)=275.0 (M+H + ) 
     Preparation Example 3-2. Preparation of 3-(2,4-difluorophenyl)-7-fluoro-4-oxo-3,4-dihydrophthalazin-1-yl trifluoromethanesulfonate (I-13) and 3-(2,4-difluorophenyl)-6-fluoro-4-oxo-3,4-dihydrophthalazin-1-yl trifluoromethanesulfonate (I-14) 
     Phthalic anhydride (5.00 g, 33.76 mmol) and 2,4-difluorophenylhydrazine hydrochloride (6.70 g, 37.13 mmol) were reacted in the same manner as in Preparation Example 3-1, to obtain 648 mg of Compound I-13 and 530 mg of Compound I-14 were obtained. 
     LC-MS (ESI, m/z)=407.1 (M+H + ) 
     Preparation Example 4: Preparation of 2-(4-fluoro-phenyl)-1-oxo-1,2-dihydropyrido[3,4-d]pyridazin-4-yl trifluoromethanesulfonate (I-15) 
     Step 1: Furo[3,4-c]pyridine-1,3-dione (200 mg, 1.341 mmol) and (4-fluorophenyl)hydrazine hydrochloride (262 mg, 1.61 mmol) were diluted in acetic acid (2 mL) and then stirred at 120° C. for 15 hours. The temperature of the reaction solution was lowered to 0° C. to 5° C., and after adding purified water, resulting mixture was stirred for 30 minutes, and filtered to separate precipitated solid. The obtained solid and NaOH (80 mg, 2.011 mmol) were diluted in EtOH and then stirred at 40° C. for one or more hours. The reaction solution was then concentrated under reduced pressure and diluted in purified water, and pH of which was adjusted to 6 using 1N HCl. After stirring precipitated crystals for 10 or more minutes, filtering was performed, to obtain 260 mg of 2-(4-fluorophenyl)-2,3-dihydropyrido[3,4-d]pyridazine-1,4-dione. 
     LC-MS (ESI, m/z)=258.1(M+H + ) 
     Step 2: The compound (200 mg, 0.778 mmol) obtained in Step 1 and tetraethylammonium (TEA; 217 μL, 1.555 mmol) were diluted in 5 mL of DCM, of which temperature was then lowered to −10° C. to −5° C. Trifluoromethanesulfonic anhydride (158 μL, 0.933 mmol) diluted in 1 mL of DCM was added dropwise to the reaction solution for 10 minutes and then stirred for one hour while gradually increasing the temperature to room temperature. Subsequently, after diluting the reaction solution in an aqueous ammonium chloride solution and DCM, organic layer was dehydrated over Na 2 SO 4 , concentrated under reduced pressure, and then reaction product was separated by column chromatography, to obtain 64 mg of the title compound. 
     LC-MS (ESI, m/z)=390.1(M+H + ) 
     Preparation Example 5: Preparation of methyl 2-methyl-2-(piperazin-2-yl)propionate (I-16) 
     Step 1: Dibenzylethylenediamine (1.61 g, 6.70 mmol), methyl (E)-4-bromobut-2-enoate (1.00 g, 6.00 mmol) and Et 3 N (2.8 ml, 16.75 mmol) were dissolved in anhydrous toluene (20 ml) and then stirred at room temperature for 48 hours. The reaction product was diluted with EtOAc and washed with saturated aqueous NaHCO 3 , and then organic layer was extracted. The separated organic layer was dehydrated over anhydrous Na 2 SO 4 , concentrated under reduced pressure, and then reaction product was separated by column chromatography, to obtain 1.1 g of methyl 2-(1,4-dibenzylpiperazin-2-yl)acetate. 
     LC-MS (ESI, m/z)=339.2 (M+H + ) 
     Step 2: The compound (1.00 g, 2.96 mmol) obtained in Step 1 was dissolved in anhydrous tetrahydrofuran (THF; 20 ml), and temperature was lowered to −78° C. 2M Lithium diisopropylamide (LDA)-THF (5.9 ml, 11.80 mmol) was slowly added and stirred at −30° C. for one hour. After again lowering the temperature of the reaction solution to −78° C., iodomethane (0.55 ml, 8.86 mmol) and hexamethylphosphoramide (HMPA; 10 μl, 0.06 mmol) were added. The temperature of the reaction mixture was slowly increased to 0° C., and then stirring was performed at room temperature for five hours. Subsequently, the reaction product was diluted with EtOAc and washed with saturated aqueous NaHCO 3 , and then organic layer was extracted. The separated organic layer was dehydrated over anhydrous Na 2 SO 4 , concentrated under reduced pressure, and then reaction product was separated by column chromatography, to obtain 360 mg of methyl 2-(1,4-dibenzylpiperazin-2-yl)-2-methylpropionate. 
     LC-MS (ESI, m/z)=367.2 (M+H + ) 
     Step 3: After dissolving the compound (260 mg, 0.71 mmol) obtained in Step 2 in anhydrous MeOH (10 ml), Pd/C (38 mg) and Pd(OH) 2  were added and stirred at room temperature for four hours. The reaction solution was filtered using a Celite Pad, washed with MeOH, concentrated under reduced pressure to remove an organic solvent, and then reaction product was separated by column chromatography, to obtain 125 mg of the title compound. 
     LC-MS (ESI, m/z)=339.2 (M+H + ) 
     Example 1: N-(3-(4-Oxo-3-phenyl-3,4-dihydrophthalazin-1-yl)phenyl)ethanesulfonamide 
     Step 1: Compound I-1 (500 mg, 1.95 mmol), 3-aminophenylboronic acid (293 mg, 2.14 mmol), Pd(OAc) 2  (13 mg, 0.06 mmol) and sSPhos (60 mg, 0.12 mmol) were added to 1,4-dioxane/distilled water (14 mL, 1:1 ratio) and then stirred at 100° C. for five hours. The reaction product was diluted with EtOAc and washed with purified water. Organic layer was separated, dehydrated over anhydrous Na 2 SO 4 , concentrated under reduced pressure, and then reaction product was separated by column chromatography, to obtain 412 mg of 4-(3-aminophenyl)-2-phenylphthalazin-1(2H)-one. 
     LC-MS (ESI, m/z)=314.4 (M+H + ) 
     Step 2: Pyridine (10 mL) was added to the compound (200 mg, 0.63 mmol) obtained in Step 1 and, after adding ethanesulfonyl chloride (73 μL, 0.76 mmol) dropwise, resulting mixture was stirred at room temperature for five hours. The reaction product was diluted with EtOAc and washed with purified water. Organic layer was separated, dehydrated over anhydrous Na 2 SO 4 , and concentrated under reduced pressure, and then reaction product was separated by column chromatography, to obtain 122 mg of the title compound. 
     LC-MS (ESI, m/z)=406.5 (M+H + ) 
     Example 2: 4-(3-Aminophenyl)-2-(4-(trifluoromethyl)phenyl)phthalazin-1(2H)-one 
     Compound I-3 (500 mg, 1.54 mmol) was used instead of Compound I-1 and reacted in the same manner as in Step 1 of Example 1, to obtain 408 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=382.2 (M+H + ) 
     Example 3: N-(3-(4-Oxo-3-(4-(trifluoromethyl)phenyl)-3,4-dihydrophthalazin-1-yl)phenyl)ethanesulfonamide 
     The compound (100 mg, 0.26 mmol) of Example 2 was reacted in the same manner as in Step 2 of Example 1, to obtain 78 mg of the title compound. 
     LC-MS (ESI, m/z)=473.9 (M+H + ) 
     Example 4: 4-(3-(Ethylamino)phenyl)-2-(4-(trifluoro-methyl)phenyl)phthalazin-1(2H)-one 
     The compound (100 mg, 0.26 mmol) of Example 2, acetaldehyde (24 μL, 0.40 mmol) and an 8M borane-pyridine complex (50 μL, 0.40 mmol) were dissolved in MeOH (7 mL) and then reacted at room temperature for 24 hours in the presence of a 4 Å molecular sieve. The reaction solution was filtered using a Celite Pad, washed with MeOH, concentrated under reduced pressure to remove an organic solvent, and then reaction product was separated by column chromatography, to obtain 45 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=410.5 (M+H + ) 
     Example 5: N-Methyl-N-(3-(4-oxo-3-(4-(trifluoromethyl)phenyl)-3,4-dihydrophthalazin-1-yl)phenyl)ethanesulfonamide 
     The compound (50 mg, 0.11 mmol) of Example 3 was dissolved in dimethylformamide (DMF; 2 mL) and, after adding K 2 CO 3  (30 mg, 0.22 mmol) and iodomethane (8 μL, 0.13 mmol), reacted at 50° C. for 24 hours. After diluting The reaction mixture with EtOAc and washing with purified water, organic layer was dehydrated over anhydrous Na 2 SO 4 , concentrated under reduced pressure, and then reaction product was separated by column chromatography, to obtain 45 mg of the title compound. 
     LC-MS (ESI, m/z)=474.1 (M+H + ) 
     Example 6: N-(3-(4-Oxo-3-phenyl-3,4-dihydrophthalazin-1-yl)phenyl)methanesulfonamide 
     The compound (50 mg, 0.16 mmol) obtained in Step 1 of Example 1 and methanesulfonyl chloride (14.8 μL, 0.19 mmol) were reacted in the same manner as in Step 2 of Example 1, to obtain 48 mg of the title compound. 
     LC-MS (ESI, m/z)=392.0 (M+H + ) 
     Example 7: N-Methyl-N-(3-(4-oxo-3-phenyl-3,4-dihydro-phthalazin-1-yl)phenyl)methanesulfonamide 
     The compound (20 mg, 0.05 mmol) of Example 6 was reacted in the same manner as in Example 5, to obtain 21 mg of the title compound. 
     LC-MS (ESI, m/z)=406.1 (M+H + ) 
     Example 8: N-(4-(4-Oxo-3-phenyl-3,4-dihydrophthalazin-1-yl)phenyl)ethanesulfonamide 
     Compound I-1 (500 mg, 1.95 mmol) and 4-aminophenylboronic acid (293 mg, 2.14 mmol) were reacted in the same manner as in Example 1, to obtain 187 mg of the title compound. 
     LC-MS (ESI, m/z)=406.5 (M+H + ) 
     Example 9: N-(3-(3-Phenyl)-4-oxo-3,4-dihydro-phthalazin-1-yl)phenyl)-dimethylsulfamoylamide 
     The compound (50 mg, 0.16 mmol) obtained in Step 1 of Example 1 and N,N-dimethylsulfamoyl chloride (20 μL, 0.19 mmol) were reacted in the same manner as in Step 2 of Example 1, to obtain 41 mg of the title compound. 
     LC-MS (ESI, m/z)=421.1 (M+H + ) 
     Example 10: N-(3-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)methanesulfonamide 
     Step 1: Compound I-2 (500 mg, 1.83 mmol) and 3-aminophenylboronic acid (375 mg, 2.74 mmol) were reacted in the same manner as in Step 1 of Example 1, to obtain 440 mg of 4-(3-aminophenyl)-2-(4-fluorophenyl)phthalazin-1(2H)-one. 
     LC-MS (ESI, m/z)=332.1 (M+H + ) 
     Step 2: The compound (100 mg, 0.30 mmol) obtained in Step 1 and methanesulfonic anhydride (68 μL, 0.36 mmol) were reacted in the same manner as in Step 2 of Example 1, to obtain 78 mg of the title compound. 
     LC-MS (ESI, m/z)=410.0 (M+H + ) 
     Example 11: N-(3-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)ethanesulfonamide 
     The compound (50 mg, 0.15 mmol) obtained in Step 1 of Example 10 and ethanesulfonyl chloride (17 μL, 0.18 mmol) were reacted in the same manner as in Step 2 of Example 1, to obtain 47 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=424.2 (M+H + ) 
     Example 12: N-(3-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)dimethylsulfamoylamide 
     The compound (50 mg, 0.15 mmol) obtained in Step 1 of Example 10 and N,N-dimethylsulfamoyl chloride (19 μL, 0.18 mmol) were reacted in the same manner as in Step 2 of Example 1, to obtain 34 mg of the title compound. 
     LC-MS (ESI, m/z)=439.2 (M+H + ) 
     Example 13: (Z)—N-Methyl-1-(3-(4-oxo-3-phenyl-3,4-dihydrophthalazin-1-yl)phenyl)methanimine Oxide 
     Step 1: Compound I-1 (1 g, 3.02 mmol), 3-formylphenylboronic acid (543 mg, 3.62 mmol) and Pd(PPh 3 ) 4  (104 mg, 0.09 mmol) were added to 1,4-dioxane (50 mL) and, after also adding Na 2 CO 3  (1.5 g, 14.48 mmol) dissolved in H 2 O (15 mL), resulting mixture was stirred at 110° C. for two hours. The reaction product was diluted with EtOAc and washed with purified water, and then organic layer was separated, dehydrated over anhydrous Na 2 SO 4 , concentrated under reduced pressure, and then reaction product was separated by column chromatography, to obtain 1.2 g of 3-(4-oxo-3-phenyl-3,4-dihydrophthalazin-1-yl)benzaldehyde. 
     LC-MS (ESI, m/z)=327.1 (M+H + ) 
     Step 2: The compound (100 mg, 0.31 mmol) obtained in Step 1 was dissolved in anhydrous EtOH (5 mL) and, after adding N-methylhydroxylamine hydrochloride (128 mg, 1.53 mmol) and potassium acetate (150 mg, 1.53 mmol), resulting mixture was stirred at room temperature for 48 hours. After concentered to remove the EtOH solvent, dilution with EtOAc and washing with purified water were performed. Organic layer was separated, dehydrated over anhydrous Na 2 SO 4 , concentrated under reduced pressure, and then reaction product was separated by column chromatography, to obtain 45 mg of the title compound. 
     LC-MS (ESI, m/z)=356.1 (M+H + ) 
     Example 14: (Z)—N-Isopropyl-1-(3-(4-oxo-3-phenyl-3,4-dihydrophthalazin-1-yl)phenyl)methanimine Oxide 
     The compound (100 mg, 0.31 mmol) obtained in Step 1 of Example 13 and N-isopropylhydroxylamine hydrochloride (170 mg, 1.53 mmol) were reacted in the same manner as in Step 2 of Example 13, to obtain 51 mg of the title compound. 
     LC-MS (ESI, m/z)=384.2 (M+H + ) 
     Example 15: (Z)-1-(3-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-methylmethanimine Oxide 
     Compound I-2 (100 mg, 0.36 mmol) was used as a starting material and reacted in the same manner as in Example 13, to obtain 42 mg of the title compound. 
     LC-MS (ESI, m/z)=374.1 (M+H + ) 
     Example 16: (Z)—N-Ethyl-1-(3-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)methanimine Oxide 
     Compound I-2 (100 mg, 0.36 mmol) and N-ethylhydroxylamine hydrochloride (174 mg, 1.8 mmol) were reacted in the same manner as in Example 13, to obtain 54 mg of the title compound. 
     LC-MS (ESI, m/z)=388.1 (M+H + ) 
     Example 17: (Z)-1-(3-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-isopropylmethanimine Oxide 
     Compound I-2 (100 mg, 0.36 mmol) and N-isopropylhydroxylamine hydrochloride (199 mg, 1.8 mmol) were reacted in the same manner as in Example 13, to obtain 44 mg of the title compound. 
     LC-MS (ESI, m/z)=402.2 (M+H + ) 
     Example 18: N-(2-Chloro-5-(4-oxo-3-phenyl-3,4-dihydrophthalazin-1-yl)phenyl)-N-(methylsulfonyl)methane-sulfonamide 
     Compound I-1 (100 mg, 0.39 mmol), (3-amino-4-chlorophenyl)boronic acid (80 mg, 0.47 mmol) and methanesulfonic anhydride (162 μL, 0.85 mmol) were reacted in the same manner as in Example 10, to obtain 37 mg of the title compound. 
     LC-MS (ESI, m/z)=504.04 (M+H + ) 
     Example 19: N-(3-(3-(Phenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)-6-chlorophenyl)dimethyl Sulfamoylamide 
     Compound I-1 (100 mg, 0.39 mmol), (3-amino-4-chlorophenyl)boronic acid (80 mg, 0.47 mmol) and N,N-dimethylsulfamoyl chloride (50 μL, 0.47 mmol) were reacted in the same manner as in Example 10, to obtain 54 mg of the title compound. 
     LC-MS (ESI, m/z)=455.09 (M+H + ) 
     Example 20: Methyl (N-(3-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)sulfamoyl) Carbamate 
     The compound (100 mg, 0.30 mmol) obtained in Step 1 of Example 11 and methyl (chlorosulfonyl)carbamate (62 mg, 0.36 mmol) were reacted in the same manner as in Step 2 of Example 1, to obtain 77 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=469.0 (M+H + ) 
     Example 21: (Z)-1-(3-(3-(2,4-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-methyl methanimine Oxide 
     Compound I-9 (100 mg, 0.34 mmol) was used instead of Compound I-1 and reacted in the same manner as in Example 13, to obtain 50 mg of the title compound. 
     LC-MS (ESI, m/z)=392.1 (M+H + ) 
     Example 22: (Z)-1-(3-(3-(2,4-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-isopropyl Methanimine Oxide 
     Compound I-9 (100 mg, 0.34 mmol) and N-isopropylhydroxylamine hydrochloride (190 mg, 1.70 mmol) were reacted in the same manner as in Example 13, to obtain 58 mg of the title compound. 
     LC-MS (ESI, m/z)=420.0 (M+H + ) 
     Example 23: (Z)—N-tert-Butyl-1-(3-(3-(2,4-difluoro phenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)methanimine Oxide 
     Compound I-9 (100 mg, 0.34 mmol) and N-tert-butylhydroxylamine hydrochloride (212 mg, 1.70 mmol) were reacted in the same manner as in Example 13, to obtain 36 mg of the title compound. 
     LC-MS (ESI, m/z)=434.2 (M+H + ) 
     Example 24: 4-(3-Aminophenyl)-2-(2,4-difluorophenyl)phthalazin-1(2H)-one 
     Compound I-9 (1.00 g, 3.41 mmol) and 3-aminophenylboronic acid (513 mg, 3.75 mmol) were reacted in the same manner as in Step 1 of Example 1, to obtain 801 mg of the title compound. 
     LC-MS (ESI, m/z)=349.9 (M+H + ) 
     Example 25: N-(3-(3-(2,4-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)ethanesulfonamide 
     The compound (50 mg, 0.14 mmol) obtained in Example 24 and ethanesulfonyl chloride (16 μL, 0.17 mmol) were reacted in the same manner as in Step 2 of Example 1, to obtain 33 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=442.1 (M+H + ) 
     Example 26: Methyl (N-(3-(3-(2,4-difluorophenyl)-4-oxo-3,4-dinydrophthalazin-1-yl)phenyl)sulfamoyl)carbamate 
     The compound (100 mg, 0.28 mmol) of Example 24 and methyl (chlorosulfonyl)carbamate (57 mg, 0.33 mmol) were reacted in the same manner as in Step 2 of Example 1, to obtain 71 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=487.0 (M+H + ) 
     Example 27: (Z)-1-(3-(3-(3-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-methylmethanimine Oxide 
     Compound I-6 (100 mg, 0.36 mmol), 3-formylphenylboronic acid (64 mg, 0.43 mmol) and N-methylhydroxylamine hydrochloride (151 mg, 1.80 mmol) were reacted in the same manner as in Example 13, to obtain 42 mg of the title compound. 
     LC-MS (ESI, m/z)=374.0 (M+H + ) 
     Example 28: (Z)-1-(3-(3-(3-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-isopropylmethanimine Oxide 
     Compound I-6 (100 mg, 0.36 mmol), 3-formylphenylboronic acid (64 mg, 0.43 mmol) and N-isopropylhydroxylamine hydrochloride (201 mg, 1.80 mmol) were reacted in the same manner as in Example 13, to obtain 55 mg of the title compound. 
     LC-MS (ESI, m/z)=402.2 (M+H + ) 
     Example 29: (Z)—N-tert-Butyl-1-(3-(3-(3-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)methanimine Oxide 
     Compound I-6 (100 mg, 0.36 mmol), 3-formylphenylboronic acid (64 mg, 0.43 mmol) and N-tert-butylhydroxylamine hydrochloride (226 mg, 1.80 mmol) were reacted in the same manner as in Example 13, to obtain 30 mg of the title compound. 
     LC-MS (ESI, m/z)=416.1 (M+H + ) 
     Example 30: N-(3-(3-(3-Fluorophenyl)-4-oxo-3,4-dihydro phthalazin-1-yl)phenyl)ethanesulfonamide 
     Compound I-6 (100 mg, 0.36 mmol), 3-aminophenylboronic acid (59 mg, 0.43 mmol) and ethenesulfonyl chloride (41 μL, 0.43 mmol) were reacted in the same manner as in Example 1, to obtain 66 mg of the title compound. 
     LC-MS (ESI, m/z)=424.1 (M+H + ) 
     Example 31: (Z)-1-(3-(3-(3,5-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-isopropyl Methanimine Oxide 
     Compound I-7 (100 mg, 0.34 mmol), 3-formylphenylboronic acid (64 mg, 0.43 mmol) and N-isopropylhydroxylamine hydrochloride (201 mg, 1.80 mmol) were reacted in the same manner as in Example 13, to obtain 64 mg of the title compound. 
     LC-MS (ESI, m/z)=420.1 (M+H + ) 
     Example 32: (Z)—N-Isopropyl-1-(3-(3-(4-methoxy phenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl) Methanimine Oxide 
     Compound I-4 (100 mg, 0.35 mmol), 3-formylphenylboronic acid (62 mg, 0.42 mmol) and N-isopropylhydroxylamine hydrochloride (196 mg, 1.75 mmol) were reacted in the same manner as in Example 13, to obtain 55 mg of the title compound. 
     LC-MS (ESI, m/z)=414.1 (M+H + ) 
     Example 33: (Z)-1-(3-(3-(3-Chloro-4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-isopropyl-methanimine Oxide 
     Compound I-8 (100 mg, 0.33 mmol), 3-formylphenylboronic acid (60 mg, 0.40 mmol) and N-isopropylhydroxylamine hydrochloride (184 mg, 1.65 mmol) were reacted in the same manner as in Example 13, to obtain 47 mg of the title compound. 
     LC-MS (ESI, m/z)=436.1 (M+H + ) 
     Example 34: (Z)—N-tert-Butyl-1-(3-(3-(3-chloro-4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl) Methanimine Oxide 
     Compound I-8 (100 mg, 0.33 mmol), 3-formylphenylboronic acid (60 mg, 0.40 mmol) and N-tert-butylhydroxylamine hydrochloride (208 mg, 1.65 mmol) were reacted in the same manner as in Example 13, to obtain 41 mg of the title compound. 
     LC-MS (ESI, m/z)=450.3 (M+H + ) 
     Example 35: (Z)—N-Benzyl-1-(3-(4-oxo-3-phenyl-3,4-dihydrophthalazin-1-yl)phenyl)methanimine Oxide 
     Compound I-1 (100 mg, 0.38 mmol), 3-formylphenylboronic acid (68 mg, 0.45 mmol) and N-benzylhydroxylamine hydrochloride (302 mg, 1.90 mmol) were reacted in the same manner as in Example 13, to obtain 60 mg of the title compound. 
     LC-MS (ESI, m/z)=432.1 (M+H + ) 
     Example 36: (E)-1-(4-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-methylmethanimine Oxide 
     Compound I-2 (100 mg, 0.36 mmol), 4-formylphenylboronic acid (65 mg, 0.43 mmol) and N-methylhydroxylamine hydrochloride (149 mg, 1.80 mmol) were reacted in the same manner as in Example 13, to obtain 51 mg of the title compound. 
     LC-MS (ESI, m/z)=374.0 (M+H + ) 
     Example 37: (Z)-1-(3-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-isopropyl methanimine Oxide 
     Compound I-2 (100 mg, 0.36 mmol), 3-formylphenylboronic acid (65 mg, 0.43 mmol) and N-isopropylhydroxylamine hydrochloride (200 mg, 1.80 mmol) were reacted in the same manner as in Example 13, to obtain 43 mg of the title compound. 
     LC-MS (ESI, m/z)=402.2 (M+H + ) 
     Example 38: (E)-1-(3-Fluoro-4-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-methylmethanimine Oxide 
     Compound I-2 (100 mg, 0.36 mmol), (2-fluoro-4-formylphenyl)boronic acid (72 mg, 0.43 mmol) and N-methylhydroxylamine hydrochloride (149 mg, 1.80 mmol) were reacted in the same manner as in Example 13, to obtain 37 mg of the title compound. 
     LC-MS (ESI, m/z)=392.1 (M+H + ) 
     Example 39: (E)-1-(3-Fluoro-4-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-isopropylmethanimine Oxide 
     Compound I-2 (100 mg, 0.36 mmol), (2-fluoro-4-formylphenyl)boronic acid (72 mg, 0.43 mmol) and N-isopropylhydroxylamine hydrochloride (200 mg, 1.80 mmol) were reacted in the same manner as in Example 13, to obtain 44 mg of the title compound. 
     LC-MS (ESI, m/z)=420.0 (M+H + ) 
     Example 40: (Z)-1-(2-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-methylmethanimine Oxide 
     Compound I-2 (100 mg, 0.36 mmol), 2-formylphenylboronic acid (65 mg, 0.43 mmol) and N-methylhydroxylamine hydrochloride (149 mg, 1.80 mmol) were reacted in the same manner as in Example 13, to obtain 54 mg of the title compound. 
     LC-MS (ESI, m/z)=374.3 (M+H + ) 
     Example 41: (Z)-1-(2-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-isopropyl Methanimine Oxide 
     Compound I-2 (100 mg, 0.36 mmol), 2-formylphenylboronic acid (65 mg, 0.43 mmol) and N-isopropylhydroxylamine hydrochloride (200 mg, 1.80 mmol) were reacted in the same manner as in Example 13, to obtain 30 mg of the title compound. 
     LC-MS (ESI, m/z)=402.1 (M+H + ) 
     Example 42: (Z)—N-tert-Butyl-1-(2-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)methanimine Oxide 
     Compound I-2 (100 mg, 0.36 mmol), 2-formylphenylboronic acid (65 mg, 0.43 mmol) and N-tert-butylhydroxylamine hydrochloride (225 mg, 1.80 mmol) were reacted in the same manner as in Example 13, to obtain 39 mg of the title compound. 
     LC-MS (ESI, m/z)=416.1 (M+H + ) 
     Example 43: (Z)—N-tert-Butyl-1-(3-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)methanimine Oxide 
     Compound I-2 (100 mg, 0.36 mmol), 3-formylphenylboronic acid (65 mg, 0.43 mmol) and N-tert-butylhydroxylamine hydrochloride (225 mg, 1.80 mmol) were reacted in the same manner as in Example 13, to obtain 48 mg of the title compound. 
     LC-MS (ESI, m/z)=416.2 (M+H + ) 
     Example 44: (Z)—N-Benzyl-1-(3-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)methanimine Oxide 
     Compound I-2 (100 mg, 0.36 mmol), 3-formylphenylboronic acid (65 mg, 0.43 mmol) and N-benzylhydroxylamine hydrochloride (286 mg, 1.80 mmol) were reacted in the same manner as in Example 13, to obtain 62 mg of the title compound. 
     LC-MS (ESI, m/z)=450.0 (M+H + ) 
     Example 45: (Z)-1-(5-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)thiophen-2-yl)-N-methylmethanimine Oxide 
     Compound I-2 (100 mg, 0.36 mmol), 5-formyl-2-thienylboronic acid (67 mg, 0.43 mmol) and N-methylhydroxylamine hydrochloride (149 mg, 1.80 mmol) were reacted in the same manner as in Example 13, to obtain 55 mg of the title compound. 
     LC-MS (ESI, m/z)=380.3 (M+H + ) 
     Example 46: (Z)-1-(5-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)thiophen-2-yl)-N-isopropylmethanimine Oxide 
     Compound I-2 (100 mg, 0.36 mmol), 5-formyl-2-thienylboronic acid (67 mg, 0.43 mmol) and N-isopropylhydroxylamine hydrochloride (200 mg, 1.80 mmol) were reacted in the same manner as in Example 13, to obtain 47 mg of the title compound. 
     LC-MS (ESI, m/z)=407.9 (M+H + ) 
     Example 47: (Z)—N-tert-Butyl-1-(5-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)thiophen-2-yl)methanimine Oxide 
     Compound I-2 (100 mg, 0.36 mmol), 5-formyl-2-thienylboronic acid (67 mg, 0.43 mmol) and N-tert-butylhydroxylamine hydrochloride (225 mg, 1.80 mmol) were reacted in the same manner as in Example 13, to obtain 35 mg of the title compound. 
     LC-MS (ESI, m/z)=422.2 (M+H + ) 
     Example 48: (Z)-1-(5-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)furan-2-yl)-N-isopropylmethanimine Oxide 
     Compound I-2 (100 mg, 0.36 mmol), 5-formyl-2-furanylboronic acid (60 mg, 0.43 mmol) and N-isopropylhydroxylamine hydrochloride (200 mg, 1.80 mmol) were reacted in the same manner as in Example 13, to obtain 40 mg of the title compound. 
     LC-MS (ESI, m/z)=392.1 (M+H + ) 
     Example 49: (Z)—N-tert-Butyl-1-(5-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)-2-methoxyphenyl)methan Imine Oxide 
     Compound I-2 (100 mg, 0.36 mmol), 3-formyl-4-methoxyphenylboronic acid (77 mg, 0.43 mmol) and N-tert-butylhydroxylamine hydrochloride (225 mg, 1.80 mmol) were reacted in the same manner as in Example 13, to obtain 45 mg of the title compound. 
     LC-MS (ESI, m/z)=446.2 (M+H + ) 
     Example 50: (Z)—N-Benzyl-1-(5-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)-2-methoxyphenyl)methanimine Oxide 
     Compound I-2 (100 mg, 0.36 mmol), 3-formyl-4-methoxyphenylboronic acid (77 mg, 0.43 mmol) and N-benzylhydroxylamine hydrochloride (286 mg, 1.80 mmol) were reacted in the same manner as in Example 13, to obtain 50 mg of the title compound. 
     LC-MS (ESI, m/z)=480.0 (M+H + ) 
     Example 51: (Z)-1-(2-Fluoro-5-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-methylmethanimine Oxide 
     Compound I-2 (100 mg, 0.36 mmol), 4-fluoro-3-formylphenylboronic acid (72 mg, 0.43 mmol) and N-methylhydroxylamine hydrochloride (149 mg, 1.80 mmol) were reacted in the same manner as in Example 13, to obtain 43 mg of the title compound. 
     LC-MS (ESI, m/z)=392.1 (M+H + ) 
     Example 52: (Z)-1-(2-Fluoro-5-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-isopropylmethanimine Oxide 
     Compound I-2 (100 mg, 0.36 mmol), 4-fluoro-3-formylphenylboronic acid (72 mg, 0.43 mmol) and N-isopropylhydroxylamine hydrochloride (200 mg, 1.80 mmol) were reacted in the same manner as in Example 13, to obtain 47 mg of the title compound. 
     LC-MS (ESI, m/z)=420.0 (M+H + ) 
     Example 53: (Z)—N-tert-Butyl-1-(2-fluoro-5-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl) Methanimine Oxide 
     Compound I-2 (100 mg, 0.36 mmol), 4-fluoro-3-formylphenylboronic acid (72 mg, 0.43 mmol) and N-tert-butylhydroxylamine hydrochloride (225 mg, 1.80 mmol) were reacted in the same manner as in Example 13, to obtain 30 mg of the title compound. 
     LC-MS (ESI, m/z)=434.1 (M+H + ) 
     Example 54: (Z)—N-Benzyl-1-(2-fluoro-5-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl) Methanimine Oxide 
     Compound I-2 (100 mg, 0.36 mmol), 4-fluoro-3-formylphenylboronic acid (72 mg, 0.43 mmol) and N-benzylhydroxylamine hydrochloride (286 mg, 1.80 mmol) were reacted in the same manner as in Example 13, to obtain 57 mg of the title compound. 
     LC-MS (ESI, m/z)=467.9 (M+H + ) 
     Example 55: (Z)-1-(4-Fluoro-3-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-methylmethanimine Oxide 
     Compound I-2 (100 mg, 0.36 mmol), 2-fluoro-5-formylphenylboronic acid (72 mg, 0.43 mmol) and N-methylhydroxylamine hydrochloride (149 mg, 1.80 mmol) were reacted in the same manner as in Example 13, to obtain 46 mg of the title compound. LC-MS (ESI, m/z)=392.1 (M+H + ) 
     Example 56: (Z)-1-(4-Fluoro-3-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-isopropylmethanimine Oxide 
     Compound I-2 (100 mg, 0.36 mmol), 2-fluoro-5-formylphenylboronic acid (72 mg, 0.43 mmol) and N-isopropylhydroxylamine hydrochloride (200 mg, 1.80 mmol) were reacted in the same manner as in Example 13, to obtain 42 mg of the title compound. 
     LC-MS (ESI, m/z)=419.8 (M+H + ) 
     Example 57: (Z)—N-tert-Butyl-1-(4-fluoro-3-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl) Methanimine Oxide 
     Compound I-2 (100 mg, 0.36 mmol), 2-fluoro-5-formylphenylboronic acid (72 mg, 0.43 mmol) and N-tert-butylhydroxylamine hydrochloride (225 mg, 1.80 mmol) were reacted in the same manner as in Example 13, to obtain 31 mg of the title compound. 
     LC-MS (ESI, m/z)=434.1 (M+H + ) 
     Example 58: (Z)—N-Benzyl-1-(4-fluoro-3-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl) Methanimine Oxide 
     Compound I-2 (100 mg, 0.36 mmol), 2-fluoro-5-formylphenylboronic acid (72 mg, 0.43 mmol) and N-benzylhydroxylamine hydrochloride (286 mg, 1.80 mmol) were reacted in the same manner as in Example 13, to obtain 43 mg of the title compound. 
     LC-MS (ESI, m/z)=468.0 (M+H + ) 
     Example 59: 4-(4-Chloro-3-nitrophenyl)-2-(4-fluorophenyl)phthalazin-1(2H)-one 
     Compound I-2 (100 mg, 0.36 mmol) and 4-chloro-3-nitrophenylboronic acid (86 mg, 0.43 mmol) were reacted in the same manner as in Step 1 of Example 1, to obtain 125 mg of the title compound. 
     LC-MS (ESI, m/z)=396.0 (M+H + ) 
     Example 60: 4-(3-Aminophenyl)-2-(4-fluorophenyl) phthalazin-1(2H)-one 
     Compound I-2 (1.00 g, 3.64 mmol) and 3-aminophenylboronic acid (548 mg, 4.00 mmol) were reacted in the same manner as in Step 1 of Example 1, to obtain 1.14 g of the title compound. 
     LC-MS (ESI, m/z)=332.1 (M+H + ) 
     Example 61: N-(3-(3-Benzyl-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)ethanesulfonamide 
     Step 1: 4-Chlorophthalazin-1(2H)-one (200 mg, 1.10 mmol) was dissolved in DMF (10 mL), of which temperature was then lowered to 0° C. After adding NaH (50 mg, 1.3 mmol) and stirring for 10 minutes at 0° C., benzyl bromide (145 μL, 1.20 mmol) was slowly added. After reacting at room temperature for two hours, completion of the reaction was confirmed by TLC, and the reaction solution was diluted with EtOAc and washed with purified water. Organic layer was dehydrated over anhydrous Na 2 SO 4 , concentrated under reduced pressure, and then reaction product was separated by column chromatography, to obtain 170 mg of 2-benzyl-4-chlorophthalazin-1(2H)-one. 
     LC-MS (ESI, m/z)=271.0 (M+H + ) 
     Step 2: The compound (100 mg, 0.37 mmol) obtained in Step 1 was dissolved in dioxane (5 mL), and then Pd(dppf)Cl 2  (27 mg, 10 mol %), (3-aminophenyl)boronic acid (56 mg, 0.40 mmol), K 3 PO 4  (235 mg, 1.10 mmol) and sSPhos (19 mg, 10 mol %) were added. The resulting mixture was stirred at 100° C. for eight hours, and then the reaction solution was diluted with EtOAc and washed with purified water. Organic layer was dehydrated over anhydrous Na 2 SO 4 , concentrated under reduced pressure, and then reaction product was separated by column chromatography, to obtain 83 mg of 4-(3-aminophenyl)-2-benzylphthalazin-1(2H)-one. 
     LC-MS (ESI, m/z)=328.2 (M+H + ) 
     Step 3: The compound (50 mg, 0.15 mmol) obtained in Step 2 was reacted in the same manner as in Step 2 of Example 1, to obtain 34 mg of the title compound. 
     LC-MS (ESI, m/z)=420.1 (M+H + ) 
     Example 62: N-(3-(4-Oxo-3-phenethyl-3,4-dihydro phthalazin-1-yl)phenyl)ethanesulfonamide 
     (2-Bromoethyl)benzene (147 μL, 1.08 mmol) was used instead of benzyl bromide and reacted in the same manner as in Example 61, to obtain 61 mg of the title compound. 
     LC-MS (ESI, m/z)=434.0 (M+H + ) 
     Example 63: N-(3-(3-(4-Fluorobenzyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)ethanesulfonamide 
     1-(Bromomethyl)-4-fluorobenzene (135 μL, 1.08 mmol) was used instead of benzyl bromide and reacted in the same manner as in Example 61, to obtain 57 mg of the title compound. 
     LC-MS (ESI, m/z)=438.1 (M+H + ) 
     Example 64: N-(3-(3-([1,1′-Biphenyl]-4-yl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)ethane Sulfonamide 
     [1,1′-Biphenyl]-4-ylboronic acid (513.20 mg, 2.59 mmol) was used instead of 3-aminophenylboronic acid and reacted in the same manner as in Example 1, to obtain 130 mg of the title compound. 
     LC-MS (ESI, m/z)=482.2 (M+H + ) 
     Example 65: N-(3-(3-([1,1′-Biphenyl]-4-yl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-methylethanesulfonamide 
     The compound (60 mg, 0.10 mmol) of Example 64 was used as a starting material and reacted in the same manner as in Example 5, to obtain 59 mg of the title compound. 
     LC-MS (ESI, m/z)=496.0 (M+H + ) 
     Example 66: Methyl 3-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)benzoate 
     Compound I-2 (1.00 g, 3.64 mmol) and (3-(methoxycarbonyl)phenyl)boronic acid (851.76 mg, 4.73 mmol) were reacted in the same manner as in Step 1 of Example 1, to obtain 785 mg of the title compound. 
     LC-MS (ESI, m/z)=374.0 (M+H + ) 
     Example 67: N-(3-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydro phthalazin-1-yl)phenyl)propan-2-sulfonamide 
     Compound I-2 (100 mg, 0.36 mmol), 3-aminophenylboronic acid (59 mg, 0.43 mmol) and 2-propanesulfonyl chloride (48 μL, 0.43 mmol) were reacted in the same manner as in Example 1, to obtain 67 mg of the title compound. 
     LC-MS (ESI, m/z)=438.1 (M+H + ) 
     Example 68: N-(3-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)propan-1-sulfonamide 
     Compound I-2 (100 mg, 0.36 mmol), 3-aminophenylboronic acid (59 mg, 0.43 mmol) and 1-propanesulfonyl chloride (48 μL, 0.43 mmol) were reacted in the same manner as in Example 1, to obtain 67 mg of the title compound. 
     LC-MS (ESI, m/z)=438.1 (M+H + ) 
     Example 69: N-(3-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-methylmethane Sulfonamide 
     The compound (60 mg, 0.15 mmol) of Example 10 was used as a starting material and reacted in the same manner as in Example 5, to obtain 56 mg of the title compound. 
     LC-MS (ESI, m/z)=424.1 (M+H + ) 
     Example 70: N-(3-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-methylethane Sulfonamide 
     The compound (60 mg, 0.14 mmol) of Example 11 was used as a starting material and reacted in the same manner as in Example 5, to obtain 51 mg of the title compound. 
     LC-MS (ESI, m/z)=438.0 (M+H + ) 
     Example 71: N-(3-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydro phthalazin-1-yl)phenyl)cyclopropane Sulfonamide 
     Compound I-2 (100 mg, 0.36 mmol), 3-aminophenylboronic acid (59 mg, 0.43 mmol) and cyclopropanesulfonyl chloride (43 μL, 0.43 mmol) were reacted in the same manner as in Example 1, to obtain 121 mg of the title compound. 
     LC-MS (ESI, m/z)=436.1 (M+H + ) 
     Example 72: N-(3-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-methylpropan-1-sulfonamide 
     The compound (30 mg, 0.07 mmol) of Example 68 was used as a starting material and reacted in the same manner as in Example 5, to obtain 26 mg of the title compound. 
     LC-MS (ESI, m/z)=452.2 (M+H + ) 
     Example 73: N-(3-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-methylpropan-2-sulfonamide 
     The compound (30 mg, 0.07 mmol) of Example 67 was used as a starting material and reacted in the same manner as in Example 5, to obtain 25 mg of the title compound. 
     LC-MS (ESI, m/z)=452.1 (M+H + ) 
     Example 74: N-(3-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-methylcyclopropane Sulfonamide 
     The compound (30 mg, 0.07 mmol) of Example 71 was used as a starting material and reacted in the same manner as in Example 5, to obtain 20 mg of the title compound. 
     LC-MS (ESI, m/z)=450.1 (M+H + ) 
     Example 75: N-(3-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydro phthalazin-1-yl)phenyl)-N-methyl-dimethyl Sulfamoylamide 
     The compound (30 mg, 0.07 mmol) of Example 12 was used as a starting material and reacted in the same manner as in Example 5, to obtain 23 mg of the title compound. 
     LC-MS (ESI, m/z)=453.1 (M+H + ) 
     Example 76: Methyl (N-(3-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-methyl sulfamoyl) (methyl)carbamate 
     The compound (150 mg, 0.32 mmol) of Example 20 was used as a starting material and reacted in the same manner as in Example 5, to obtain 117 mg of the title compound. 
     LC-MS (ESI, m/z)=497.0 (M+H + ) 
     Example 77: 1,1,1-Trifluoro-N-(3-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)methanesulfonamide 
     Compound I-2 (200 mg, 0.72 mmol), 3-aminophenylboronic acid (118 mg, 0.86 mmol) and trifluoromethanesulfonic anhydride (144 μL, 0.86 mmol) were reacted in the same manner as in Example 1, to obtain 56 mg of the title compound. 
     LC-MS (ESI, m/z)=463.9 (M+H + ) 
     Example 78: 1,1,1-Trifluoro-N-(3-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-methylmethane Sulfonamide 
     The compound (30 mg, 0.07 mmol) of Example 77 was used as a starting material and reacted in the same manner as in Example 5, to obtain 17 mg of the title compound. 
     LC-MS (ESI, m/z)=477.9 (M+H + ) 
     Example 79: 3-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)-N-((tetrahydro-2H-pyran-2-yl)oxy)benzamide 
     Step 1: The compound (750 mg, 2.00 mmol) of Example 66 was dissolved in THF/MeOH/H 2 O (100 mL, 3:1:1 ratio) and, after adding LiOH—H 2 O (420 mg, 10.02 mmol), resulting mixture was stirred at room temperature for three hours. The reaction mixture was concentrated under reduced pressure, diluted with EtOAc, washed with a 1N aqueous HCl solution, and dehydrated over anhydrous Na 2 SO 4 , to obtain 667 mg of 3-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)benzoic acid. 
     LC-MS (ESI, m/z)=361.0 (M+H + ) 
     Step 2: The compound (150 mg, 0.42 mmol) obtained in Step 1 was dissolved in DCM (4 mL) and, after adding diisopropylethylamine (DIPEA; 0.7 mL, 4.16 mmol), 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide (EDCI; 159 mg, 0.83 mmol) and hydroxybenzotriazole (HOBt; 84 mg, 0.62 mmol), resulting mixture was stirred at room temperature for 12 hours. The reaction mixture was concentrated under reduced pressure, diluted in EtOAc, and then washed with purified water. Organic layer was dehydrated over anhydrous Na 2 SO 4 , concentrated under reduced pressure, and then reaction product was separated by column chromatography, to obtain 144 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=460.0 (M+H + ) 
     Example 80: N-(3-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-methyl-methyl Sulfamoylamide 
     The compound (63 mg, 0.13 mmol) of Example 76 was dissolved in THF/MeOH/H 2 O (5 mL, 3:1:1 ratio) and, after adding LiOH—H 2 O (16 mg, 0.38 mmol), resulting mixture was stirred at room temperature for three hours. The resulting solid compound was filtered and then dried, to obtain 40 mg of the title compound. 
     LC-MS (ESI, m/z)=439.0 (M+H + ) 
     Example 81: 4-(3-(1H-Tetrazol-5-yl)phenyl)-2-(4-fluorophenyl)phthalazin-1(2H)-one 
     Step 1: Compound I-2 (200 mg, 0.72 mmol) and 3-cyanophenylboronic acid (127 mg, 0.86 mmol) were reacted in the same manner as in Step 1 of Example 1, to obtain 214 mg of 3-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)benzonitrile. 
     LC-MS (ESI, m/z)=342.1 (M+H + ) 
     Step 2: The compound (100 mg, 0.29 mmol) obtained in Step 1, NaN 3  (23 mg, 0.35 mmol) and NH 4 Cl (19 mg, 0.35 mmol) were added to DMF (5 mL) and stirred at 120° C. for 12 hours. A 0.5 N aqueous HCl solution was added to adjust pH to 5-6, and the resulting crystals were filtered, to obtain 24 mg of the title compound. 
     LC-MS (ESI, m/z)=385.0 (M+H + ) 
     Example 82: N-(5-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)pyridin-3-yl)ethanesulfonamide 
     Compound I-2 (100 mg, 0.36 mmol), (5-aminopyridin-3-yl)boronic acid (59 mg, 0.43 mmol) and ethanesulfonyl chloride (40 μL, 0.43 mmol) were reacted in the same manner as in Example 1, to obtain 42 mg of the title compound. 
     LC-MS (ESI, m/z)=425.0 (M+H + ) 
     Example 83: 3-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydro phthalazin-1-yl)-N-hydroxybenzamide 
     MeOH (20 mL) and trifluoroacetic acid (TFA; 10 mL) were added to the compound (100 mg, 0.22 mmol) of Example 79 and then stirred at room temperature for three hours. The reaction mixture was concentrated under reduced pressure, dissolved in EtOAc, and then washed with a 1N aqueous HCl solution, and organic layer was extracted. After concentration under reduced pressure to remove the organic solvent, a small amount of diethyl ether was added and the resulting solid compound was filtered, to obtain 37 mg of the title compound. 
     LC-MS (ESI, m/z)=376.0 (M+H + ) 
     Example 84: (Z)-1-(3-(3-([1,1′-Biphenyl]-4-yl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-methylmethanimine Oxide 
     [1,1′-Biphenyl]-4-ylboronic acid (100 mg, 0.50 mmol) was used instead of 3-formylphenylboronic acid and reacted in the same manner as in Example 13, to obtain 32 mg of the title compound. 
     LC-MS (ESI, m/z)=432.1 (M+H + ) 
     Example 85: (Z)-1-(3-(3-([1,1′-Biphenyl]-4-yl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-isopropylmethanimine Oxide 
     N-isopropylhydroxylamine hydrochloride and [1,1′-biphenyl]-4-ylboronic acid (100 mg, 0.50 mmol) were used instead of N-ethylhydroxylamine hydrochloride and 3-formylphenylboronic acid, respectively, and reacted in the same manner as in Example 16, to obtain 24 mg of the title compound. 
     LC-MS (ESI, m/z)=460.0 (M+H + ) 
     Example 86: 3-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)-N-methylbenzenesulfonamide 
     Compound I-2 (80 mg, 0.29 mmol), methyl 3-boronobenzenesulfonamide (81 mg, 0.38 mmol), Pd[Ph 3 P] 4  (33 mg, 0.03 mmol) and Na 2 CO 3  (124 mg, 1.17 mmol) were added to 1,4-dioxane (10 mL) and then stirred at 110° C. for two hours. The reaction product was diluted with EtOAc and washed with purified water, and then organic layer was extracted. The separated organic layer was dehydrated over anhydrous Na 2 SO 4 , concentrated under reduced pressure, and then reaction product was separated by column chromatography, to obtain 95 mg of the title compound. 
     LC-MS (ESI, m/z)=410.1 (M+H + ) 
     Example 87: N-Ethyl-3-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)benzenesulfonamide 
     Ethyl 3-boronobenzenesulfonamide (81 mg, 0.38 mmol) was reacted in the same manner as in Example 86, to obtain 84 mg of the title compound. 
     LC-MS (ESI, m/z)=424.1 (M+H + ) 
     Example 88: 3-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)-N,N-dimethylbenzene Sulfonamide 
     N,N-Dimethyl 3-boronobenzenesulfonamide (81 mg, 0.38 mmol) was used instead of methyl 3-boronobenzenesulfonamide and reacted in the same manner as in Example 86, to obtain 47 mg of the title compound. 
     LC-MS (ESI, m/z)=424.0 (M+H + ) 
     Example 89: 2-(2,4-Difluorophenyl)-4-(3-(methyl sulfonyl)phenyl)phthalazin-1 (2H)-one 
     Compound I-9 (77 mg, 0.19 mmol) and (3-(methylsulfonyl)phenyl)boronic acid (49 mg, 0.25 mmol) were reacted in the same manner as in Example 86, to obtain 34 mg of the title compound. 
     LC-MS (ESI, m/z)=413.2 (M+H + ) 
     Example 90: 2-(2,4-Difluorophenyl)-4-(3-(ethylsulfonyl)phenyl)phthalazin-1(2H)-one 
     Compound I-9 (77 mg, 0.19 mmol) and (3-(ethylsulfonyl)phenyl)boronic acid (52 mg, 0.25 mmol) were reacted in the same manner as in Example 86, to obtain 30 mg of the title compound. 
     LC-MS (ESI, m/z)=427.1 (M+H + ) 
     Example 91: 3-(3-(2,4-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)-N-methylbenzene Sulfonamide 
     Compound I-9 (77 mg, 0.19 mmol) and (3-(N-methylsulfamoyl)phenyl)boronic acid (52 mg, 0.25 mmol) were reacted in the same manner as in Example 86, to obtain 37 mg of the title compound. 
     LC-MS (ESI, m/z)=427.9 (M+H + ) 
     Example 92: 3-(3-(2,4-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)-N-ethylbenzene Sulfonamide 
     Compound I-9 (77 mg, 0.19 mmol) and (3-(N-ethylsulfamoyl)phenyl)boronic acid (56 mg, 0.25 mmol) were reacted in the same manner as in Example 86, to obtain 44 mg of the title compound. 
     LC-MS (ESI, m/z)=442.1 (M+H + ) 
     Example 93: 3-(3-(2,4-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)-N,N-dimethylbenzene Sulfonamide 
     Compound I-9 (77 mg, 0.19 mmol) and (3-(N,N-dimethylsulfamoyl)phenyl)boronic acid (56 mg, 0.25 mmol) were reacted in the same manner as in Example 86, to obtain 44 mg of the title compound. 
     LC-MS (ESI, m/z)=442.0 (M+H + ) 
     Example 94: (Z)-1-(3-(3-(2-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-methyl Methanimine Oxide 
     Compound I-5 (100 mg, 0.36 mmol), 3-formylphenylboronic acid (63 mg, 0.42 mmol) and N-methylhydroxylamine hydrochloride (145 mg, 1.75 mmol) were reacted in the same manner as in Example 13, to obtain 51 mg of the title compound. 
     LC-MS (ESI, m/z)=374.1 (M+H + ) 
     Example 95: (Z)-1-(3-(3-(2-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-isopropyl Methanimine Oxide 
     Compound I-5 (100 mg, 0.36 mmol), 3-formylphenylboronic acid (63 mg, 0.42 mmol) and N-isopropylhydroxylamine hydrochloride (194 mg, 1.75 mmol) were reacted in the same manner as in Example 13, to obtain 32 mg of the title compound. 
     LC-MS (ESI, m/z)=402.0 (M+H + ) 
     Example 96: (Z)—N-tert-Butyl-1-(3-(3-(2-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)methanimine Oxide 
     Compound I-5 (100 mg, 0.36 mmol), 3-formylphenylboronic acid (63 mg, 0.42 mmol) and N-tert-butylhydroxylamine hydrochloride (218 mg, 1.75 mmol) were reacted in the same manner as in Example 13, to obtain 30 mg of the title compound. 
     LC-MS (ESI, m/z)=416.1 (M+H + ) 
     Example 97: 2-(2-Fluorophenyl)-4-(3-(methylsulfonyl)phenyl)phthalazin-1(2H)-one 
     Compound I-5 (52 mg, 0.19 mmol) and (3-(methylsulfonyl)phenyl)boronic acid (49 mg, 0.25 mmol) were reacted in the same manner as in Example 86, to obtain 39 mg of the title compound. 
     LC-MS (ESI, m/z)=395.0 (M+H + ) 
     Example 98: 4-(3-(Ethylsulfonyl)phenyl)-2-(2-fluoro phenyl)phthalazin-1(2H)-one 
     Compound I-5 (52 mg, 0.19 mmol) and (3-(ethylsulfonyl)phenyl)boronic acid (53 mg, 0.25 mmol) were reacted in the same manner as in Example 86, to obtain 41 mg of the title compound. 
     LC-MS (ESI, m/z)=408.8 (M+H + ) 
     Example 99: 3-(3-(2-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)-N-methylbenzenesulfonamide 
     Compound I-5 (52 mg, 0.19 mmol) and (3-(N-methylsulfamoyl)phenyl)boronic acid (52 mg, 0.25 mmol) were reacted in the same manner as in Example 86, to obtain 28 mg of the title compound. 
     LC-MS (ESI, m/z)=410.0 (M+H + ) 
     Example 100: N-Ethyl-3-(3-(2-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)benzenesulfonamide 
     Compound I-5 (52 mg, 0.19 mmol) and (3-(N-ethylsulfamoyl)phenyl)boronic acid (56 mg, 0.25 mmol) were reacted in the same manner as in Example 86, to obtain 36 mg of the title compound. 
     LC-MS (ESI, m/z)=423.8 (M+H + ) 
     Example 101: 3-(3-(2-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)-N,N-dimethylbenzene Sulfonamide 
     Compound I-5 (52 mg, 0.19 mmol) and (3-(N,N-dimethylsulfamoyl)phenyl)boronic acid (56 mg, 0.25 mmol) were reacted in the same manner as in Example 86, to obtain 30 mg of the title compound. 
     LC-MS (ESI, m/z)=424.1 (M+H + ) 
     Example 102: (Z)-1-(3-(3-(2,6-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-methylmethanimine Oxide 
     Compound I-10 (140 mg, 0.34 mmol), 3-formylphenylboronic acid (64 mg, 0.43 mmol) and N-methylhydroxylamine hydrochloride (150 mg, 1.80 mmol) were reacted in the same manner as in Example 13, to obtain 45 mg of the title compound. 
     LC-MS (ESI, m/z)=392.1 (M+H + ) 
     Example 103: (Z)-1-(3-(3-(2,6-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-isopropylmethanimine Oxide 
     Compound I-10 (140 mg, 0.34 mmol), 3-formylphenylboronic acid (64 mg, 0.43 mmol) and N-isopropylhydroxylamine hydrochloride (200 mg, 1.80 mmol) were reacted in the same manner as in Example 13, to obtain 39 mg of the title compound. 
     LC-MS (ESI, m/z)=420.1 (M+H + ) 
     Example 104: (Z)—N-tert-Butyl-1-(3-(3-(2,6-difluoro phenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)methanimine Oxide 
     Compound I-10 (140 mg, 0.34 mmol), 3-formylphenylboronic acid (64 mg, 0.43 mmol) and N-tert-butylhydroxylamine hydrochloride (225 mg, 1.80 mmol) were reacted in the same manner as in Example 13, to obtain 36 mg of the title compound. 
     LC-MS (ESI, m/z)=434.0 (M+H + ) 
     Example 105: 2-(2,6-Difluorophenyl)-4-(3-(methyl sulfonyl)phenyl)phthalazin-1 (2H)-one 
     Compound I-10 (70 mg, 0.17 mmol) and (3-(methylsulfonyl)phenyl)boronic acid (49 mg, 0.25 mmol) were reacted in the same manner as in Example 86, to obtain 30 mg of the title compound. 
     LC-MS (ESI, m/z)=413.0 (M+H + ) 
     Example 106: 2-(2,6-Difluorophenyl)-4-(3-(ethyl sulfonyl)phenyl)phthalazin-1(2H)-one 
     Compound I-10 (70 mg, 0.17 mmol) and (3-(ethylsulfonyl)phenyl)boronic acid (53 mg, 0.25 mmol) were reacted in the same manner as in Example 86, to obtain 48 mg of the title compound. 
     LC-MS (ESI, m/z)=427.0 (M+H + ) 
     Example 107: 3-(3-(2,6-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)-N-methylbenzenesulfonamide 
     Compound I-10 (70 mg, 0.17 mmol) and (3-(N-methylsulfamoyl)phenyl)boronic acid (53 mg, 0.25 mmol) were reacted in the same manner as in Example 86, to obtain 39 mg of the title compound. 
     LC-MS (ESI, m/z)=428.2 (M+H + ) 
     Example 108: 3-(3-(2,6-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)-N-ethylbenzenesulfonamide 
     Compound I-10 (70 mg, 0.17 mmol) and (3-(N-ethylsulfamoyl)phenyl)boronic acid (57 mg, 0.25 mmol) were reacted in the same manner as in Example 86, to obtain 46 mg of the title compound. 
     LC-MS (ESI, m/z)=442.0 (M+H + ) 
     Example 109: 3-(3-(2,6-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)-N,N-dimethylbenzenesulfonamide 
     Compound I-10 (70 mg, 0.17 mmol) and (3-(N,N-dimethylsulfamoyl)phenyl)boronic acid (57 mg, 0.25 mmol) were reacted in the same manner as in Example 86, to obtain 30 mg of the title compound. 
     LC-MS (ESI, m/z)=442.1 (M+H + ) 
     Example 110: 6-Fluoro-4-(3-(methylsulfonyl)phenyl)-2-phenylphthalazin-1(2H)-one 
     Compound I-11 (70 mg, 0.26 mmol) and (3-(methylsulfonyl)phenyl)boronic acid (66 mg, 0.33 mmol) were reacted in the same manner as in Example 86, to obtain 91 mg of the title compound. 
     LC-MS (ESI, m/z)=395.0 (M+H + ) 
     Example 111: 3-(7-Fluoro-4-oxo-3-phenyl-3,4-dihydrophthalazin-1-yl)-N-methylbenzenesulfonamide 
     Compound I-11 (70 mg, 0.26 mmol) and (3-(N-methylsulfamoyl)phenyl)boronic acid (71 mg, 0.33 mmol) were reacted in the same manner as in Example 86, to obtain 44 mg of the title compound. 
     LC-MS (ESI, m/z)=410.0 (M+H + ) 
     Example 112: 7-Fluoro-4-(3-(methylsulfonyl)phenyl)-2-phenylphthalazin-1(2H)-one 
     Compound I-12 (70 mg, 0.26 mmol) and (3-(methylsulfonyl)phenyl)boronic acid (66 mg, 0.33 mmol) were reacted in the same manner as in Example 86, to obtain 84 mg of the title compound. 
     LC-MS (ESI, m/z)=395.0 (M+H + ) 
     Example 113: 3-(6-Fluoro-4-oxo-3-phenyl-3,4-dihydro phthalazin-1-yl)-N-methylbenzenesulfonamide 
     Compound I-12 (70 mg, 0.26 mmol) and (3-(N-methylsulfamoyl)phenyl)boronic acid (71 mg, 0.33 mmol) were reacted in the same manner as in Example 86, to obtain 51 mg of the title compound. 
     LC-MS (ESI, m/z)=410.0 (M+H + ) 
     Example 114: 3-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)pyridine 1-oxide 
     Step 1: Compound I-2 (173 mg, 0.63 mmol) and 3-pyridinylboronic acid (141 mg, 0.94 mmol) were reacted in the same manner as in Step 1 of Example 1, to obtain 94 mg of 2-(4-fluorophenyl)-4-(pyridin-3-yl)phthalazin-1(2H)-one. 
     LC-MS (ESI, m/z)=318.0 (M+H + ) 
     Step 2: The compound (74 mg, 0.26 mmol) obtained in Step 1 was dissolved in DCM (40 mL) and, after adding meta-chloroperoxybenzoic acid (mCPBA; 136 mg, 0.79 mmol), resulting mixture was stirred at room temperature for four hours. The reaction solution was diluted with EtOAc and washed with purified water, and organic layer was dehydrated over anhydrous Na 2 SO 4  and then reaction product was separated by column chromatography, to obtain 46 mg of the title compound. 
     LC-MS (ESI, m/z)=334.0 (M+H + ) 
     Example 115: 2-(2,4-Difluorophenyl)-4-(pyridin-3-yl)phthalazin-1(2H)-one 
     Compound I-9 (180 mg, 0.44 mmol) and 3-pyridinylboronic acid (99 mg, 0.66 mmol) were reacted in the same manner as in Step 1 of Example 1, to obtain 85 mg of the title compound. 
     LC-MS (ESI, m/z)=336.0 (M+H + ) 
     Example 116: 2-(2,6-Difluorophenyl)-4-(pyridin-3-yl)phthalazin-1(2H)-one 
     Compound I-10 (180 mg, 0.44 mmol) and 3-pyridinylboronic acid (99 mg, 0.66 mmol) were reacted in the same manner as in Step 1 of Example 1, to obtain 96 mg of the title compound. 
     LC-MS (ESI, m/z)=336.2 (M+H + ) 
     Example 117: 3-(3-(2,4-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)pyridine 1-oxide 
     The compound (70 mg, 0.21 mmol) of Example 115 was reacted in the same manner as in Step 2 of Example 114, to obtain 60 mg of the title compound. 
     LC-MS (ESI, m/z)=352.0 (M+H + ) 
     Example 118: 3-(3-(2,6-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)pyridine 1-oxide 
     The compound (70 mg, 0.21 mmol) of Example 116 was reacted in the same manner as in Step 2 of Example 114, to obtain 54 mg of the title compound. 
     LC-MS (ESI, m/z)=352.0 (M+H + ) 
     Example 119: 2-(2,4-Difluorophenyl)-6-fluoro-4-(3-(methylsulfonyl)phenyl)phthalazin-1(2H)-one 
     Compound I-13 (70 mg, 0.16 mmol) and (3-(methylsulfonyl)phenyl)boronic acid (42 mg, 0.21 mmol) were reacted in the same manner as in Example 86, to obtain 36 mg of the title compound. 
     LC-MS (ESI, m/z)=431.0 (M+H + ) 
     Example 120: 2-(2,4-Difluorophenyl)-7-fluoro-4-(3-(methylsulfonyl)phenyl)phthalazin-1(2H)-one 
     Compound I-14 (70 mg, 0.16 mmol) and (3-(methylsulfonyl)phenyl)boronic acid (42 mg, 0.21 mmol) were reacted in the same manner as in Example 86, to obtain 30 mg of the title compound. 
     LC-MS (ESI, m/z)=431.0 (M+H + ) 
     Example 121: 3-(3-(2,4-Difluorophenyl)-7-fluoro-4-oxo-3,4-dihydrophthalazin-1-yl)-N-methylbenzenesulfonamide 
     Compound I-13 (70 mg, 0.16 mmol) and (3-(N-methylsulfamoyl)phenyl)boronic acid (45 mg, 0.21 mmol) were reacted in the same manner as in Example 86, to obtain 9 mg of the title compound. 
     LC-MS (ESI, m/z)=446.0 (M+H + ) 
     Example 122: 3-(3-(2,4-Difluorophenyl)-6-fluoro-4-oxo-3,4-dihydrophthalazin-1-yl)-N-methylbenzenesulfonamide 
     Compound I-14 (70 mg, 0.16 mmol) and (3-(N-methylsulfamoyl)phenyl)boronic acid (45 mg, 0.21 mmol) were reacted in the same manner as in Example 86, to obtain 39 mg of the title compound. 
     LC-MS (ESI, m/z)=446.1 (M+H + ) 
     Example 123: 2-(2,4-Difluorophenyl)-4-(3-(ethylsulfonyl)phenyl)-6-fluorophthalazin-1(2H)-one 
     Compound I-13 (70 mg, 0.16 mmol) and (3-(ethylsulfonyl)phenyl)boronic acid (45 mg, 0.21 mmol) were reacted in the same manner as in Example 86, to obtain 26 mg of the title compound. 
     LC-MS (ESI, m/z)=445.0 (M+H + ) 
     Example 124: 3-(3-(2,4-Difluorophenyl)-7-fluoro-4-oxo-3,4-dihydrophthalazin-1-yl)-N-ethylbenzenesulfonamide 
     Compound I-13 (70 mg, 0.16 mmol) and (3-(N-ethylsulfonyl)phenyl)boronic acid (49 mg, 0.21 mmol) were reacted in the same manner as in Example 86, to obtain 18 mg of the title compound. 
     LC-MS (ESI, m/z)=460.1 (M+H + ) 
     Example 125: 3-(3-(2,4-Difluorophenyl)-7-fluoro-4-oxo-3,4-dihydrophthalazin-1-yl)-N,N-dimethylbenzenesulfonamide 
     Compound I-13 (70 mg, 0.16 mmol) and (3-(N,N-dimethylsulfonyl)phenyl)boronic acid (49 mg, 0.21 mmol) were reacted in the same manner as in Example 86, to obtain 28 mg of the title compound. 
     LC-MS (ESI, m/z)=460.0 (M+H + ) 
     Example 126: 3-(3-(2,4-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)benzenesulfonamide 
     Compound I-9 (70 mg, 0.17 mmol) and (3-sulfamoylphenyl)boronic acid (52 mg, 0.26 mmol) were reacted in the same manner as in Example 86, to obtain 44 mg of the title compound. 
     LC-MS (ESI, m/z)=414.1 (M+H + ) 
     Example 127: 3-(3-(2,4-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)-N-(2-hydroxyethyl)benzene Sulfonamide 
     Compound I-9 (70 mg, 0.17 mmol) and (3-(N-(2-hydroxyethyl)sulfamoyl)phenyl)boronic acid (63 mg, 0.26 mmol) were reacted in the same manner as in Example 86, to obtain 51 mg of the title compound. 
     LC-MS (ESI, m/z)=458.0 (M+H + ) 
     Example 128: N-(3-(3-Cyclohexyl-4-oxo-3,4-dihydro phthalazin-1-yl)phenyl)ethanesulfonamide 
     Step 1: 4-Bromophthalazin-1(2H)-one (300 mg, 1.333 mmol) and K 2 CO 3  (368 mg, 2.67 mmol) were diluted in DMF (4.4 mL) and, after adding bromocyclohexane (326 mg, 2.00 mmol), resulting mixture was stirred at 100° C. for 24 hours. The reaction solution was allowed to cool to room temperature, diluted with ethyl acetate (EA), and then washed with purified water. Organic layer was dehydrated over Na 2 SO 4 , concentrated under reduced pressure, and then reaction product was separated by column chromatography, to obtain 108.7 mg of 4-bromo-2-cyclohexylphthalazin-1(2H)-one in white solid. 
     LC-MS (ESI, m/z)=107.0 (M+H + ) 
     Step 2: The compound (105 mg, 0.342 mmol) obtained in Step 1 and (3-aminophenyl)boronic acid (51.5 mg, 0.376 mmol) were reacted in the same manner as in Step 1 of Example 1, to obtain 60.1 mg of 4-(3-aminophenyl)-2-cyclohexylphthalazin-1(2H)-one in white solid. 
     LC-MS (ESI, m/z)=320.1(M+H + ) 
     Step 3: The compound (32 mg, 0.100 mmol) obtained in Step 2 was dissolved in pyridine, of which temperature was then lowered to 0 to 5° C., and after adding ethanesulfonyl chloride (11.39 μL, 0.120 mmol) dropwise for five minutes, resulting mixture was stirred at room temperature for two hours. The reaction solution was diluted with EA and then washed four or five times with saturated aqueous CuSO 4  solution. Organic layer was dehydrated over Na 2 SO 4 , concentrated under reduced pressure, and then reaction product was separated by column chromatography, to obtain 31.3 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=412.1(M+H + ) 
     Example 129: N-(3-(3-(1-Methylpiperidin-4-yl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)ethane Sulfonamide 
     4-Bromo-1-methylpiperidine (356 mg, 2.00 mmol) was used instead of bromocyclohexane and reacted in the same manner as in Example 128, to obtain 34 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=427.1(M+H + ) 
     Example 130: 3-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)benzonitrile 
     Compound I-2 (147 mg, 0.461 mmol) and (3-cyanophenyl)boronic acid (74.5, mg, 0.507 mmol) were reacted in the same manner as in Step 1 of Example 1, to obtain 71 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=342.0(M+H + ) 
     Example 131: (E)-3-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)-N′-hydroxybenzimidamide 
     The compound (20 mg, 0.059 mmol) of Example 130, hydroxylamine hydrochloride (4.89 mg, 0.070 mmol) and NaHCO 3 (7.38 mg, 0.088 mmol) were dissolved in EtOH (585 μL) and stirred at 80° C. for three hours. After allowing the reaction solution to cool to room temperature, water was added, and precipitated solid was filtered and washed with distilled water. The filtered solid was crystallized and dried using DCM and MeOH, to obtain 6.4 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=375.2 (M+H + ) 
     Example 132: N-(3-(3-Isopropyl-4-oxo-3,4-dihydro phthalazin-1-yl)phenyl)ethanesulfonamide 
     2-Iodopropane (340 mg, 2.00 mmol) was used instead of bromocyclohexane and reacted in the same manner as in Example 128, to obtain 45 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=372.0 (M+H + ) 
     Example 133: N-(3-(3-(1-Methyl-1H-pyrazol-4-yl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)ethanesulfonamide 
     (1-Methyl-1H-pyrazol-4-yl)boronic acid (252 mg, 2.00 mmol) was used instead of bromocyclohexane and reacted in the same manner as in Example 128, to obtain 45 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=410.1 (M+H + ) 
     Example 134: 4-(3-Aminopiperidin-1-yl)-2-(4-fluorophenyl)phthalazin-1(2H)-one-hydrochloride 
     Step 1: Compound I-2 (70 mg, 0.219 mmol), tert-butyl piperidin-3-ylcarbamate (52.7 mg, 0.263 mmol), XPhos (90 mg, 0.940 mmol) and NaOtBu (90 mg, 0.940 mmol) were diluted in toluene (1.04 mL) and, after adding Pd 2 (dba) 3 , reacted at 120° C. for one hour in a microwave reactor. The reaction solution was allowed to cool to room temperature, diluted with EA, and washed with purified water. Organic layer was dehydrated over Na 2 SO 4 , concentrated under reduced pressure, and then reaction product was separated by column chromatography, to obtain 47 mg of tert-butyl (1-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)piperidin-3-yl)carbamate in white solid. 
     LC-MS (ESI, m/z)=439.1 (M+H + ) 
     Step 2: The compound (50 mg, 0.114 mmol) obtained in Step 1 was dissolved in DCM (380 μL). After slowly adding 4M HCl in dioxane (855 μL) at 0° C., reaction solution was stirred at room temperature for two hours. After concentrating, precipitated solid was filtered, washed with ether and then dried, to obtain 43 mg of the title compound in pale yellow solid. 
     LC-MS (ESI, m/z)=339.1 (M+H + ) 
     Example 135: N-(1-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)piperidin-3-yl)ethanesulfonamide 
     The compound (20 mg, 0.053 mmol) of Example 134 was reacted in the same manner as in Step 3 of Example 128, to obtain 5.5 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=431.1 (M+H + ) 
     Example 136: N-(3-(3-(Oxetan-3-yl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)ethanesulfonamide 
     3-Tosyl oxetane (71 mg, 0.334 mmol) was used instead of bromocyclohexane and reacted in the same manner as in Example 128, to obtain 57 mg of the title compound in pale yellow solid. 
     LC-MS (ESI, m/z)=386.1 (M+H + ) 
     Example 137: N-(1-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)pyrrolidin-3-yl)ethanesulfonamide 
     tert-Butyl pyrrolidin-3-ylcarbamate (140 mg, 0.752 mmol) and Compound I-2 (200 mg, 0.627 mmol) were reacted in the same manner as in Example 134 and then Step 3 of Example 128, to obtain 55 mg of pale yellow title compound. 
     LC-MS (ESI, m/z)=417.0 (M+H + ) 
     Example 138: (S)—N-(1-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)piperidin-3-yl)ethanesulfonamide 
     tert-Butyl (S)-(1-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)carbamate (102 mg, 0.233 mmol) and Compound I-2 (150 mg, 0.470 mmol) were reacted in the same manner as in Example 137, to obtain 25 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=431.1 (M+H + ) 
     Example 139: (R)—N-(1-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)piperidin-3-yl)ethanesulfonamide 
     tert-Butyl (R)-(1-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)carbamate (113 mg, 0.564 mmol) and Compound I-2 (150 mg, 0.470 mmol) were reacted in the same manner as in Example 137, to obtain 14 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=431.1 (M+H + ) 
     Example 140: N-(3-(3-(4,4-Difluorocyclohexyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)ethanesulfonamide 
     Step 1: 4-Bromophthalazin-1(2H)-one (50 mg, 0.222 mmol) and 4,4-difluorocyclohexan-1-ol (36.6 mg, 0.267 mmol) were dissolved in THF (741 μL) and, after adding PPh 3  (87 mg, 0.333 mmol) and diisopropyl azodicarboxylate (DIAD; 67.4 mg, 0.333 mmol) at 0° C., resultant was stirred at room temperature for one hour. The reaction solution was diluted with EA and washed with purified water. Organic layer was dehydrated over Na 2 SO 4 , concentrated under reduced pressure, and then reaction product was separated by column chromatography, to obtain 49.5 mg of 4-bromo-2-(4,4-difluorocyclohexyl)phthalazin-1(2H)-one in white solid. 
     LC-MS (ESI, m/z)=343.0(M+H + ) 
     Step 2: The compound (150 mg, 0.437 mmol) obtained in Step 1 was reacted in the same manner as in Step 2 and Step 3 of Example 128, to obtain 18.6 mg of the title compound in pale ocher solid. 
     LC-MS (ESI, m/z)=448.1 (M+H + ) 
     Example 141: N-(1-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)azepan-3-yl)ethanesulfonamide 
     tert-Butyl azepan-3-ylcarbamate (121 mg, 0.564 mmol) and Compound I-2 (150 mg, 0.470 mmol) were reacted in the same manner as in Example 137, to obtain 15.6 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=445.1 (M+H + ) 
     Example 142: 3-(3-Cyclohexyl-4-oxo-3,4-dihydro phthalazin-1-yl)benzenesulfonamide 
     The compound (156 mg, 0.508 mmol) obtained in Step 1 of Example 128 and (3-sulfamoylphenyl)boronic acid (122 mg, 0.610 mmol) were reacted in the same manner as in Step 2 of Example 128, to obtain 20 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=384.0 (M+H + ) 
     Example 143: 4-(3-Aminoazepan-1-yl)-2-cyclohexyl phthalazin-1(2H)-one-hydrochloride 
     4-Bromo-2-cyclohexylphthalazin-1(2H)-one (132 mg, 0.430 mmol) and tert-butyl azepan-3-ylcarbamate (111 mg, 0.516 mmol) were reacted in the same manner as in Example 134, to obtain 55.8 mg of the title compound inn ivory solid. 
     LC-MS (ESI, m/z)=341.0 (M+H + ) 
     Example 144: N-(1-(3-Cyclohexyl-4-oxo-3,4-dihydrophthalazin-1-yl)azepan-3-yl)ethanesulfonamide 
     The compound (30 mg, 0.080 mmol) of Example 143 was reacted in the same manner as in Step 3 of Example 128, to obtain 18 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=433.2 (M+H + ) 
     Example 145: N-(3-(3-(4-Methylcyclohexyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)ethanesulfonamide 
     1-Bromo-4-methylcyclohexane (590 mg, 3.33 mmol) and 4-bromophthalazin-1(2H)-one (500 mg, 2.22 mmol) were reacted in the same manner as in Example 128, to obtain 15.8 mg of the title compound in pale yellow solid. 
     LC-MS (ESI, m/z)=426.0 (M+H + ) 
     Example 146: (S)-4-(3-Aminopiperidin-1-yl)-2-cyclohexylphthalazin-1(2H)-one-hydrochloride 
     4-Bromo-2-cyclohexylphthalazin-1(2H)-one (140 mg, 0.456 mmol) and tert-butyl (S)-piperidin-3-ylcarbamate (110 mg, 0.547 mmol) were reacted in the same manner as in Example 134, to obtain 87 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=327.2 (M+H + ) 
     Example 147: (S)—N-(1-(3-Cyclohexyl-4-oxo-3,4-dihydrophthalazin-1-yl)piperidin-3-yl)ethanesulfonamide 
     The compound (30 mg, 0.083 mmol) of Example 146 was reacted in the same manner as in Step 3 of Example 128, to obtain 6 mg of the title compound in pale yellow compound. 
     LC-MS (ESI, m/z)=419.1 (M+H + ) 
     Example 148: 4-(3-Aminoazepan-1-yl)-2-(4-fluorophenyl)phthalazin-1(2H)-one-hydrochloride 
     Compound I-2 (150 mg, 0.470 mmol) and tert-butyl azepan-3-ylcarbamate (121 mg, 0.564 mmol) were reacted in the same manner as in Example 134, to obtain 9 mg of the title compound inn ochre solid. 
     LC-MS (ESI, m/z)=353.1 (M+H + ) 
     Example 149: N-(3-(2-(4-Fluorophenyl)-1-oxo-1,2-dihydropyrido[3,4-d]pyridin-4-yl)phenyl)ethanesulfonamide 
     Step 1: 2-(4-Fluorophenyl)-1-oxo-1,2-dihydropyrido [3,4-d]pyridazin-4-yl trifluoromethanesulfonate (64 mg, 0.164 mmol), (3-aminophenyl)boronic acid (24.77 mg, 0.181 mmol), lithium chloride (20.91 mg, 0.493 mmol), Pd(PPh 3 ) 4  (19 mg, 0.016 mmol) and a 2M aqueous Na 2 CO 3  solution (247 μL, 0.493 mmol) were diluted in 1.6 mL of toluene and stirred at a temperature of 100 to 110° C. for three hours. The reaction solution was allowed to cool to room temperature, diluted with EA, and then washed with purified water. Organic layer was dehydrated over Na 2 SO 4 , concentrated under reduced pressure, and then reaction product was separated by column chromatography, to obtain 35 mg of 4-(3-aminophenyl)-2-(4-fluorophenyl)pyrido[3,4-d]pyradizin-1(2H)-one in pale yellow solid. 
     LC-MS (ESI, m/z)=333.0 (M+H + ) 
     Step 2: The compound (35 mg, 0.105 mmol) obtained in Step 1 was reacted in the same manner as in Step 3 of Example 128, to obtain 16 mg of the title compound in pale yellow solid. 
     LC-MS (ESI, m/z)=425.0 (M+H + ) 
     Example 150: N-(3-(3-(4-Fluorophenyl)-8-methyl-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)ethanesulfonamide 
     Step 1: 4-Methyl-isobenzofuran-1,3-dione (500 mg, 3.08 mmol) and (3-aminophenyl)boronic acid (602 mg, 3.7 mmol) were reacted in a manner similar to Preparation Example 4, to obtain 281 mg of 3-(4-fluorophenyl)-8-methyl-4-oxo-3,4-dihydrophthalazin-1-yl trifluoromethanesulfonate in white solid. 
     LC-MS (ESI, m/z)=403.0 (M+H + ) 
     Step 2: The compound (76 mg, 0.189 mmol) obtained in Step 1 was reacted in the same manner as in Example 149, to obtain 29 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=438.0 (M+H + ) 
     Example 151: N-(3-(4-Oxo-3-(tetrahydro-2H-pyran-4-yl)-3,4-dihydrophthalazin-1-yl)phenyl)ethanesulfonamide 
     4-Iodotetrahydro-2H-pyran (300 mg, 1.333 mmol) was used instead of bromocyclohexane and reacted in the same manner as in Example 128, to obtain 34 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=427.1(M+H + ) 
     Example 152: 2-(3-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-2-methylpropanoic Acid 
     Step 1: Compound I-2 (110 mg, 0.345 mmol) and methyl 2-methyl-2-(3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)propionate (115 mg, 0.0.379 mmol) were reacted in the same manner as in Step 1 of Example 1, to obtain 82 mg of methyl 2-(3-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-2-methyl propionate in white solid. 
     LC-MS (ESI, m/z)=417.0(M+H + ) 
     Step 2: The compound (82 mg, 0.197 mmol) obtained in Step 1 and a 2M aqueous NaOH solution (148 μL, 0.295 mmol) were diluted in MeOH and THF and then stirred at 40° C. for two hours. After concentrating, purified water was added, pH of which was adjusted to 6-7 using 1N HCl, and then extraction was performed using DCM. Organic layer was dehydrated over Na 2 SO 4 , concentrated under reduced pressure, and then crystallized with diethyl ether, to obtain 50 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=403.0(M+H + ) 
     Example 153: 2-(3-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N,2-dimethylpropanamide 
     The compound (44 mg, 0.109 mmol) of Example 152, methylamine HCl (8.86 mg, 0.131 mmol) and DIPEA (57.3 μL, 0.328 mmol) were diluted with DMF (0.4 mL), a temperature was lowered to 0 to 5° C., and after adding PyBOP (85 mg, 0.164 mmol), resulting mixture was stirred for 18 hours while gradually increasing a temperature to room temperature. The reaction solution was diluted with EA and washed with purified water, and organic layer was dehydrated over Na 2 SO 4 , concentrated under reduced pressure, and then reaction product was separated by column chromatography, to obtain 22 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=416.1 (M+H + ) 
     Example 154: 2-Cyclohexyl-4-(3-(methylsulfonyl)phenyl)phthalazin-1(2H)-one 
     4-Bromo-2-cyclohexylphthalazin-1(2H)-one (19 mg, 0.062 mmol) and (3-(methylsulfonyl)phenyl)boronic acid (14.85 mg, 0.074 mmol) were reacted in the same manner as in Step 2 of Example 128, to obtain 14 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=383.0 (M+H + ) 
     Example 155: (S)-4-(3-Aminoazepan-1-yl)-2-cyclohexyl phthalazin-1(2H)-one-hydrochloride 
     4-Bromo-2-cyclohexylphthalazin-1(2H)-one (250 mg, 0.814 mmol) and tert-butyl (S)-azepan-3-ylcarbamate (209 mg, 0.977 mmol) were reacted in the same manner as in Example 134, to obtain 108 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=341.2 (M+H + ) 
     Example 156: (S)-2-Cyclohexyl-4-(3-(methylamino) azepan-1-yl)phthalazin-1(2H)-one-hydrochloride 
     Step 1: 4-Bromo-2-cyclohexylphthalazin-1(2H)-one (250 mg, 0.814 mmol) and tert-butyl (S)-azepan-3-ylcarbamate (209 mg, 0.977 mmol) were reacted in the same manner as in Step 1 of Example 134, to obtain 108 mg of tert-butyl (S)-(1-(3-cyclohexyl-4-oxo-3,4-dihydrophthalazin-1-yl)azepan-3-yl)carbamate in white solid. 
     LC-MS (ESI, m/z)=441.1 (M+H + ) 
     Step 2: 60% NaH washed with THF was diluted in THF (221 μL), a temperature was lowered to 0° C., and after adding the compound (30 mg, 0.066 mmol) obtained in Step 1, resulting mixture was stirred for 12 minutes at the same temperature. After adding iodomethane (37.6 mg, 0.265 mmol) at 0° C., the temperature was gradually increased to room temperature, and stirring was performed for four hours. The reaction solution was diluted with EA and washed with purified water. Organic layer was dehydrated over Na 2 SO 4 , concentrated under reduced pressure, and then reaction product was separated by column chromatography, to obtain 22.3 mg of tert-butyl (S)-(1-(3-cyclohexyl-4-oxo-3,4-dihydrophthalazin-1-yl)azepan-3-yl)(methyl)carbamate in yellow oil. 
     LC-MS (ESI, m/z)=454.9 (M+H + ) 
     Step 3: The compound (22 mg, 0.047 mmol) obtained in Step 2 was reacted in the same manner as in Step 2 of Example 7, to obtain 11.6 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=355.3 (M+H + ) 
     Example 157: (S)-4-(3-Aminoazepan-1-yl)-2-(2,4-difluorophenyl)phthalazin-1(2H)-one-hydrochloride 
     Step 1: Compound I-9 (22 mg, 0.054 mmol) and tert-butyl (S)-azepan-3-ylcarbamate (29 mg, 0.135 mmol) were diluted in dimethyl sulfoxide (DMSO) and then stirred at 90° C. for one hour. The reaction solution was allowed to cool to room temperature, diluted with EA, and then washed with purified water. An organic solvent was dehydrated over Na 2 SO 4 , concentrated under reduced pressure, and then reaction product was separated by column chromatography, to obtain 14 mg of tert-butyl (S)-(1-(3-(2,4-difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)azepan-3-yl)carbamate in white solid. 
     LC-MS (ESI, m/z)=471.1 (M+H + ) 
     Step 2: The compound (14 mg, 0.030 mmol) obtained in Step 1 was reacted in the same manner as in Step 2 of Example 134, to obtain 2.2 mg of the title compound in light brown solid. 
     LC-MS (ESI, m/z)=370.9 (M+H + ) 
     Example 158: (S)-4-(3-Aminoazepan-1-yl)-2-(4-fluoro phenyl)phthalazin-1(2H)-one-hydrochloride 
     tert-Butyl (S)-azepan-3-ylcarbamate (161 mg, 0.752 mmol) and Compound I-2 (200 mg, 0.627 mmol) were reacted in the same manner as in Example 134, to obtain 8.7 mg of the title compound in yellow solid. 
     LC-MS (ESI, m/z)=353.1(M+H + ) 
     Example 159: (R)-4-(3-Aminoazepan-1-yl)-2-cyclohexyl phthalazin-1(2H)-one-hydrochloride 
     4-Bromo-2-cyclohexylphthalazin-1(2H)-one (250 mg, 0.814 mmol) and tert-butyl (R)-azepan-3-ylcarbamate (209 mg, 0.977 mmol) were reacted in the same manner as in Example 134, to obtain 108 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=341.2 (M+H + ) 
     Example 160: 2-(3-(3-Cyclohexyl-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-2-methylpropanoic Acid 
     4-Bromo-2-cyclohexylphthalazin-1(2H)-one (250 mg, 0.814 mmol) and 2-methyl-2-(3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)propionate (131 mg, 0.430 mmol) were reacted in the same manner as in Example 152, to obtain 62.1 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=391.1(M+H + ) 
     Example 161: 3-(3-(3-(4-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)oxazolidin-2-one 
     Step 1: Compound I-2 (250 mg, 0.783 mmol) and (3-aminophenyl)boronic acid (118 mg, 0.862 mmol) were reacted in the same manner as in Step 1 of Example 1, to obtain 80 mg of 4-(3-aminophenyl)-2-(4-fluorophenyl)phthalazin-1(2H)-one inn ochre solid. 
     LC-MS (ESI, m/z)=332.0(M+H + ) 
     Step 2: The compound (30 mg, 0.091 mmol) obtained in Step 1 and ethylene carbonate (39.9 mg, 0.453 mmol) were diluted in 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU; 13.65 μL, 0.091 mmol) and then stirred at 100° C. for three hours. The reaction solution was allowed to cool to room temperature, diluted with DCM, and then washed with purified water. Organic layer was dehydrated over Na 2 SO 4 , concentrated under reduced pressure, and then reaction product was separated by column chromatography, to obtain 20.7 mg of the title compound in pale yellow solid. 
     LC-MS (ESI, m/z)=402.0(M+H + ) 
     Example 162: (R)-4-(3-Aminoazepan-1-yl)-2-(4-fluoro phenyl)phthalazin-1(2H)-one-hydrochloride 
     Compound I-2 (150 mg, 0.470 mmol) and tert-butyl (R)-azepan-3-ylcarbamate (121 mg, 0.564 mmol) were reacted in the same manner as in Example 134, to obtain 8.5 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=353.1(M+H + ) 
     Example 163: 2-(3-(3-Cyclohexyl-4-oxo-3,4-dihydro phthalazin-1-yl)phenyl)-2-methylpropanamide 
     The compound (14 mg, 0.036 mmol) of Example 160 and ammonium chloride (2.88 mg, 0.054 mmol) were reacted in the same manner as in Example 153, to obtain 8.6 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=390.1(M+H + ) 
     Example 164: 2-(3-(3-Cyclohexyl-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N,2-dimethylpropanamide 
     The compound (14 mg, 0.036 mmol) of Example 160 and methylamine hydrochloride (3.63 mg, 0.054 mmol) were reacted in the same manner as in Example 153, to obtain 9.2 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=404.1(M+H + ) 
     Example 165: (R)-4-(3-Aminoazepan-1-yl)-2-(2,4-difluorophenyl)phthalazin-1(2H)-one-hydrochloride 
     Compound I-9 (300 mg, 0.738 mmol) and tert-butyl (R)-azepan-3-ylcarbamate (396 mg, 1.846 mmol) were reacted in the same manner as in Example 157, to obtain 121.7 mg of the title compound in pale yellow solid. 
     LC-MS (ESI, m/z)=371.0(M+H + ) 
     Example 166: 2-(3-(3-(2,4-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-2-methylpropanoic Acid 
     Compound I-9 (300 mg, 0.738 mmol) and 2-methyl-2-(3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl) propionate (247 mg, 0.812 mmol) were reacted in the same manner as in Example 152, to obtain 165 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=421.0(M+H + ) 
     Example 167: 4-(3-Aminoazepan-1-yl)-2-(2,4-difluoro phenyl)phthalazin-1(2H)-one-hydrochloride 
     Compound I-9 (50 mg, 0.123 mmol) and tert-butyl azepan-3-ylcarbamate (65.9 mg, 0.308 mmol) were reacted in the same manner as in Example 157, to obtain 22.9 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=371.1(M+H + ) 
     Example 168: 2-(3-(3-(2,4-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-2-methylpropanenitrile 
     Compound I-9 (400 mg, 0.985 mmol) and 2-methyl-2-(3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl) propanenitrile (294 mg, 1.083 mmol) were reacted in the same manner as in Step 1 of Example 152, to obtain 311.5 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=402.0(M+H + ) 
     Example 169: 4-(3-(2-(1H-Tetrazol-5-yl)propan-2-yl)phenyl)-2-(2,4-difluorophenyl)phthalazin-1(2H)-one 
     The compound (50 mg, 0.125 mmol) of Example 168, NaN 3  (10.53 mg, 0.162 mmol) and ammonium chloride (9.99 mg, 0.187 mmol) were diluted in DMF and then stirred at 100° C. for 16 hours. The reaction solution was allowed to cool to room temperature, diluted with EA, and then washed with purified water. Organic layer was dehydrated over Na 2 SO 4 , concentrated under reduced pressure, and then reaction product was separated by column chromatography, to obtain 3.1 mg of the title compound in pale yellow solid. 
     LC-MS (ESI, m/z)=445.0(M+H + ) 
     Example 170: (E)-2-(3-(3-(2,4-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N′-hydroxy-2-methyl propanimideamide 
     The compound (100 mg, 0.249 mmol) of Example 168, NaHCO 3  (41.9 mg, 0.498 mmol) and hydroxylamine hydrochloride (24.23 mg, 0.349 mmol) were diluted in EtOH and then stirred at 80° C. for 27 hours. The reaction solution was allowed to cool to room temperature, diluted with EA, and then washed with purified water. Organic layer was dehydrated over Na 2 SO 4 , concentrated under reduced pressure, and then reaction product was separated by column chromatography, to obtain 11.4 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=435.0(M+H + ) 
     Example 171: 2-(3-(3-(2-Fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-2-methylpropanoic Acid 
     The 3-(2-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl trifluoromethanesulfonate (100 mg, 0.258 mmol) prepared by the method of Preparation Example 4 and 2-methyl-2-(3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl) propionate (86 mg, 0.283 mmol) were reacted in the same manner as in Example 152, to obtain 37.5 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=403.0(M+H + ) 
     Example 172: 4-(3-Aminoazepan-1-yl)-2-cyclobutyl phthalazin-1(2H)-one-hydrochloride 
     4-Bromo-2-cyclobutylphthalazin-1(2H)-one (100 mg, 0.358 mmol) prepared by the method of Step 1 of Example 128 while using bromocyclobutane instead of bromocyclohexane was reacted with tert-butyl azepan-3-ylcarbamate (92 mg, 0.430 mmol) in the same manner as in Example 157, to obtain 16.6 mg of the title compound in pale yellow solid. 
     LC-MS (ESI, m/z)=313.1(M+H + ) 
     Example 173: 4-(3-Aminoazepan-1-yl)-2-cyclopentyl phthalazin-1(2H)-one-hydrochloride 
     4-Bromo-2-cyclopentylphthalazin-1(2H)-one (100 mg, 0.341 mmol) prepared by the method of Step 1 of Example 128 while using bromocyclopentane instead of bromocyclohexane, was reacted with tert-butyl azepan-3-ylcarbamate (88 mg, 0.409 mmol) in the same manner as in Example 157, to obtain 23 mg of the title compound inn ochre solid. 
     LC-MS (ESI, m/z)=327.2 (M+H + ) 
     Example 174: 2-(2,4-Difluorophenyl)-4-(3-(2-(5-methyl-1,2,4-oxadiazol-3-yl)propan-2-yl)phenyl)phthalazin-1(2H)-one 
     The compound (40 mg, 0.092 mmol) of Example 170, p-TsOH (5.25 mg, 0.028 mmol) and ZnCl 2  (3.76 mmol, 0.028 mmol) were diluted in CAN, and then stirred at 82° C. for 17 hours. The reaction solution was allowed to cool to room temperature, diluted with EA, and washed with purified water and saturated aqueous NaHCO 3 . Organic layer was dehydrated over Na 2 SO 4 , concentrated under reduced pressure, and then reaction product was separated by column chromatography, to obtain 12.5 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=459.0(M+H + ) 
     Example 175: (R)-4-(3-Aminoazepan-1-yl)-2-(2-fluoro phenyl)phthalazin-1(2H)-one-hydrochloride 
     3-(2-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl trifluoromethanesulfonate (100 mg, 0.258 mmol) prepared by the method of Preparation Example 4 and tert-butyl (R)-azepan-3-ylcarbamate (138 mg, 0.644 mmol) were reacted in the same manner as in Example 157, to obtain 26.9 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=353.0(M+H + ) 
     Example 176: 2-(3-(3-(2,4-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-isopropyl-2-methylpropanamide 
     The compound (50 mg, 0.119 mmol) of Example 166 and propan-2-amine hydrochloride (17.05 mg, 0,178 mmol) were reacted in the same manner as in Example 153, to obtain 16.4 mg of the title compound in pale yellow solid. 
     LC-MS (ESI, m/z)=462.1 (M+H + ) 
     Example 177: 2-(2,4-Difluorophenyl)-4-(3-(2-methyl-1-oxo-1-(pyrrolidin-1-yl)propan-2-yl)phenyl)phthalazin-1(2H)-one 
     The compound (50 mg, 0.119 mmol) of Example 166 and pyrrolidine (12.69 mg, 0.178 mmol) were reacted in the same manner as in Example 153, to obtain 30.7 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=474.1 (M+H + ) 
     Example 178: N-Cyclopropyl-2-(3-(3-(2,4-difluoro phenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-2-methyl Propanamide 
     The compound (50 mg, 0.119 mmol) of Example 166 and cyclopropanamine (10.19 mg, 0.178 mmol) were reacted in the same manner as in Example 153, to obtain 7.8 mg of the title compound in pale yellow solid. 
     LC-MS (ESI, m/z)=460.1 (M+H + ) 
     Example 179: 2-(2,4-Difluorophenyl)-4-(3-(2-methyl-1-morpholino-1-oxopropan-2-yl)phenyl)phthalazin-1(2H)-one 
     The compound (50 mg, 0.119 mmol) of Example 166 and morpholine (15.54 mg, 0.178 mmol) were reacted in the same manner as in Example 153, to obtain 10.1 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=490.1 (M+H + ) 
     Example 180: N-Cyclohexyl-2-(3-(3-(2,4-difluoro phenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-2-methylpropanamide 
     The compound (50 mg, 0.119 mmol) of Example 166 and cyclohexanamine (17.69 mg, 0.178 mmol) were reacted in the same manner as in Example 153, to obtain 34.7 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=502.1 (M+H + ) 
     Example 181: 2-(3-(3-(2,4-difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-2-methyl-N-phenylpropanamide 
     The compound (50 mg, 0.119 mmol) of Example 166 and aniline (16.61 mg, 0.178 mmol) were reacted in the same manner as in Example 153, to obtain 10.3 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=496.1 (M+H + ) 
     Example 182: 2-(3-(3-(2,4-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-2-methyl-N-(1-methyl-1H-pyrazol-4-yl)propanamide 
     The compound (50 mg, 0.119 mmol) of Example 166 and 1-methyl-1H-pyrazol-4-amine (17.33 mg, 0.178 mmol) were reacted in the same manner as in Example 153, to obtain 22.8 mg of the title compound in pale orange solid. 
     LC-MS (ESI, m/z)=500.1 (M+H + ) 
     Example 183: 1-(3-(3-(2,4-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)cyclopropan-1-carboxylic Acid 
     Compound I-9 (122 mg, 0.301 mmol) and 1-(3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)cyclopropan-1-carboxylic acid (100 mg, 0.331 mmol) were reacted in the same manner as in Example 152, to obtain 43.1 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=419.0 (M+H + ) 
     Example 184: 4-(1,4-Diazepan-1-yl)-2-(2,4-difluoro phenyl)phthalazin-1(2H)-one-hydrochloride 
     Compound I-9 (100 mg, 0.246 mmol) and tert-butyl 1,4-diazepane-1-carboxylate (59.2 mg, 0.295 mmol) were reacted in the same manner as in Example 157, to obtain 5 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=392.1 (M+H + ) 
     Example 185: (R)-4-(3-Aminoazepan-1-yl)-2-(4-chloro phenyl)phthalazin-1(2H)-one-hydrochloride 
     3-(4-chlorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl trifluoromethanesulfonate (100 mg, 0.247 mmol) prepared by the method of Preparation Example 2 and tert-butyl (R)-azepan-3-ylcarbamate (63.5 mg, 0.296 mmol) were reacted in the same manner as in Example 157, to obtain 72.5 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=369.1 (M+H + ) 
     Example 186: 2-(3-(3-(2,4-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-N-(2-hydroxyethyl)-2-methyl Propanamide 
     Step 1: The compound (100 mg, 0.238 mmol) of Example 166 and 2-((tert-butyldimethylsilyl)oxy)ethan-1-amine (62.6 mg, 0.357 mmol) were reacted in the same manner as in Example 153, to obtain 50 mg of N-(2-((tert-butyldimethylsilyl)oxy)ethyl)-2-(3-(3-(2,4-difluorophthal)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-2-methylpropan amide. 
     LC-MS (ESI, m/z)=577.7 (M+H + ) 
     Step 2: The compound (50 mg, 0.087 mmol) obtained in Step 1 was dissolved in THF (433 μL) and, after adding a 1 M tetra-n-butylammonium fluoride (TBAF) solution in THF (104 μL, 0.104 mmol) dropwise at −5° C., resulting mixture was stirred for 40 minutes. After adding water (10 mL), the reaction solution was diluted with EA and washed with purified water. Organic layer was dehydrated over Na 2 SO 4 , concentrated under reduced pressure, and then reaction product was separated by column chromatography, to obtain 17 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=464.1 (M+H + ) 
     Example 187: (R)—N-(1-(3-(2,4-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)azepan-3-yl)ethanesulfonamide 
     The compound (50 mg, 0.123 mmol) of Example 165 was dissolved in DCM (410 μL) and, after adding DIPEA (61.4 μL, 0.369 mmol) and ethanesulfonyl chloride (18.63 μL, 0.197 mmol) dropwise at 0° C., resulting mixture was stirred for three hours at room temperature. The reaction product was diluted with EA and washed with purified water, and subsequently, organic layer was separated, dehydrated over anhydrous Na 2 SO 4 , concentrated under reduced pressure, and then reaction product was separated by column chromatography, to obtain 18.5 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=463.1 (M+H + ) 
     Example 188: 2-(3-(3-(2,4-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-2-methylpropanamide 
     The compound (33 mg, 0.078 mmol) of Example 166 and ammonium chloride (6.3 mg, 0,178 mmol) were reacted in the same manner as in Example 153, to obtain 10.7 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=420.1 (M+H + ) 
     Example 189: (R)-2-(2,4-Difluorophenyl)-4-(3-(methylamino)azepan-1-yl)phthalazin-1(2H)-one-hydrochloride 
     Step 1: The compound (50 mg, 0.123 mmol) of Example 165 was dissolved in DMF and, after adding calcium carbonate (51.0 mg, 0.369 mmol) and iodomethane (17.44 mmol, 0.123 mmol), resulting mixture was stirred at 50° C. for 18 hours. The reaction product was diluted with EA and washed with purified water, and subsequently, organic layer was separated, dehydrated over anhydrous Na 2 SO 4 , and concentrated under reduced pressure, and then reaction product was separated by column chromatography, to obtain 20 mg of tert-butyl (R)-(1-(3-(2,4-difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)azepan-3-yl)(methyl)carbamate in pale yellow solid. 
     LC-MS (ESI, m/z)=384.1 (M+H + ) 
     Step 2: The compound (20 mg, 0.052 mmol) obtained in Step 1 was dissolved in DCM and, after slowly adding a 4M HCl solution in dioxane (65.0 μL, 0.260 mmol) dropwise at 0° C., resulting mixture was stirred for one hour. The reaction solution was concentrated under reduced pressure, to obtain 7.8 mg of the title compound in pale yellow solid. 
     LC-MS (ESI, m/z)=384.1 (M+H + ) 
     Example 190: 2-(2,4-Difluorophenyl)-4-(3-hydroxy azepan-1-yl)phthalazin-1(2H)-one 
     Step 1: Azepanone (200 mg, 1.767 mmol) was dissolved in methanol and, after slowly adding sodium bicarbonate (66.9 mg, 1.767 mmol) at 0° C., resulting mixture was stirred at room temperature for three hours. The reaction mixture was concentrated under reduced pressure and, after adding water and adjusting pH to 8-9 using 1N HCl, diluted with EA and washed with purified water. Organic layer was dehydrated over anhydrous Na 2 SO 4 , concentrated under reduced pressure, and then reaction product was separated by column chromatography, to obtain 98 mg of azepanol in pale yellow oil. 
     LC-MS (ESI, m/z)=116.1 (M+H + ) 
     Step 2: The compound (25 mg, 0.217 mmol) obtained in Step 1, 3-(4-chlorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl trifluoromethanesulfonate (76.5 mg, 0.181 mmol) and DIPEA (63.2 μL, 0.362 mmol) were reacted in the same manner as in Example 165, to obtain 3 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=372.1 (M+H + ) 
     Example 191: (R)-2-(2,4-Difluorophenyl)-4-(3-((2-hydroxyethyl)amino)azepan-1-yl)phthalazin-1(2H)-one-hydro Chloride 
     Step 1: The compound (50 mg, 0.123 mmol) of Example 165 was dissolved in DMF and, after adding (2-bromoethoxy)(tert-butyl)dimethylsilane (32.3 mg, 0.135 mmol) and cesium carbonate (80 mg, 0.246 mmol), resulting mixture was stirred at 50° C. for 16 hours. The reaction product was diluted with EA and washed with purified water, and subsequently, organic layer was separated, dehydrated over anhydrous Na 2 SO 4 , concentrated under reduced pressure, and then reaction product was separated by column chromatography, to obtain 26 mg of (R)-4-(3-((2-((tert-butyldimethylsilyl)oxy)ethyl)amino)azepan-1-yl)phthalazin-1 (2H)-one in pale yellow oil. 
     LC-MS (ESI, m/z)=528.7 (M+H + ) 
     Step 2: The compound (44.4 mg, 0.084 mmol) obtained in Step 1 was dissolved in DCM and, after slowly adding a 4M HCl solution in dioxane (840 μL, 3.36 mmol) dropwise at 0° C., resulting mixture was stirred at room temperature for one hour and thirty minutes. After adding water to the reaction mixture, pH of which was adjusted to 9 using saturated aqueous NaHCO 3 , and then reaction product was extracted with EA and washed with purified water. Organic layer was dehydrated over anhydrous Na 2 SO 4  and concentrated under reduced pressure, to obtain 22.8 mg of (R)-2-(2,4-difluorophenyl)-4-(3-((2-hydroxyethyl)amino)azepan-1-yl)phthalazin-1(2H)-one in pale yellow oil. 
     LC-MS (ESI, m/z)=415.1 (M+H + ) 
     Step 3: The compound (22.8 mg, 0.055 mmol) obtained in Step 2 was reacted in the same manner as in Step 2 of Example 189, to obtain 10.8 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=415.1 (M+H + ) 
     Example 192: (R)—N-(1-(3-(2,4-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)azepan-3-yl)acetamide 
     The compound (50 mg, 0.123 mmol) of Example 165 and acetyl chloride were reacted in the same manner as in Example 187, to obtain 12 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=413.1 (M+H + ) 
     Example 193: 2-(2,4-Difluorophenyl)-4-(3-oxoazepan-1-yl)phthalazin-1 (2H)-one 
     The compound (38.5 mg, 0.104 mmol) of Example 190 was dissolved in DCM and, after adding Dess-Martin periodinane (44 mg, 0.104 mmol) at 0° C., resulting mixture was stirred at room temperature for 23 hours. The reaction product was diluted with DCM and washed with purified water, and subsequently, organic layer was separated, dehydrated over anhydrous Na 2 SO 4 , concentrated under reduced pressure, and then reaction product was separated by column chromatography, to obtain 5.7 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=370.1 (M+H + ) 
     Example 194: 2-(3-(3-(4-Chlorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-2-methylpropanoic Acid 
     The 3-(4-chlorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl trifluoromethanesulfonate (400 mg, 0.988 mmol) prepared by the method of Preparation Example 2 and methyl 2-methyl-2-(3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)propionate (331 mg, 1.087 mmol) were reacted in the same manner as in Example 152, to obtain 219.7 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=419.1 (M+H + ) 
     Example 195: 1-(3-(3-(4-Chlorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)cyclopropan-1-carboxylic Acid 
     3-(4-Chlorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl trifluoromethanesulfonate (100 mg, 0.247 mmol) and methyl 1-(3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)cyclopropan-1-carboxylate (82 mg, 0.272 mmol) were reacted in the same manner as in Example 152, to obtain 13.5 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=417.0 (M+H + ) 
     Example 196: 2-(4-Chlorophenyl)-4-(3-hydroxyazepan-1-yl)phthalazin-1(2H)-one 
     3-(4-Chlorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl trifluoromethanesulfonate (179 mg, 0.442 mmol) and azepanone (102 mg, 0.884 mmol) were reacted in the same manner as in Example 190, to obtain 4 mg of the title compound in pale yellow solid. 
     LC-MS (ESI, m/z)=370.1 (M+H + ) 
     Example 197: 2-(3-(3-(4-Chlorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-2-methylpropanamide 
     The compound (50 mg, 0.119 mmol) of Example 194 was reacted in the same manner as in Example 163, to obtain 37.2 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=418.1 (M+H + ) 
     Example 198: 1-(3-(3-(4-Chlorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)cyclopropan-1-carboxyamide 
     The compound (11 mg, 0.026 mmol) of Example 195 was reacted in the same manner as in Example 163, to obtain 6.7 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=416.1 (M+H + ) 
     Example 199: 2-(3-(3-(2,4-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)acetic Acid 
     Compound I-9 (100 mg, 0.246 mmol) and methyl 2-(3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)acetate (82 mg, 0.295 mmol) were reacted in the same manner as in Example 152, to obtain 31.9 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=393.0 (M+H + ) 
     Example 200: 4-(3-(2-Aminopropan-2-yl)phenyl)-2-(2,4-difluorophenyl)phthalazin-1(2H)-one-hydrochloride 
     Step 1: Compound I-9 (19.7 mg, 0.048 mmol) and 2-(3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)carbamate (21 mg, 0.058 mmol) were reacted in the same manner as in Example 152, to obtain 14.5 mg of tert-butyl(2-(3-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl)propan-2-yl)carbamate in white solid. 
     LC-MS (ESI, m/z)=492.1 (M+H + ) 
     Step 2: The compound (21 mg, 0.058 mmol) obtained in Step 1 was reacted in the same manner as in Step 2 of Example 157, to obtain 8.3 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=393.0 (M+H + ) 
     Example 201: 2-(3-(3-(4-Chloro-2-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-2-methylpropanoic Acid 
     2-(4-chloro-2-fluorophenyl)-4-((trifluoromethyl) sulfonyl)-3,4-dihydrophthalazin-1(2H)-one (100 mg, 0.237 mmol) prepared by the method of Preparation Example 2 was reacted in the same manner as in Example 152, to obtain 31.6 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=437.0 (M+H + ) 
     Example 202: (R)-4-(3-Aminoazepan-1-yl)-2-(4-chloro-2-fluorophenyl)phthalazin-1-(2H)-one-hydrochloride 
     2-(4-Chloro-2-fluorophenyl)-4-((trifluoromethyl) sulfonyl)-3,4-dihydrophthalazin-1(2H)-one (100 mg, 0.237 mmol) was used as a starting material and reacted in the same manner as in Example 157, to obtain 38.7 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=387.0 (M+H + ) 
     Example 203: 1-(3-(4-Chloro-2-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)azepane-3-carbonitrile 
     2-(4-Chloro-2-fluorophenyl)-4-((trifluoromethyl) sulfonyl)-3,4-dihydrophthalazin-1(2H)-one (127 mg, 0.301 mmol) and azepane-3-carbonitrile (74.7 mg, 0.602 mmol) were reacted in the same manner as in Example 157, to obtain 50.8 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=397.0 (M+H + ) 
     Example 204: 4-(3-(1-Amino-2-methylpropan-2-yl)phenyl)-2-(2,4-difluorophenyl)phthalazin-1(2H)-one-hydro Chloride 
     Step 1: The compound (30 mg, 0.075 mmol) of Example 168 was dissolved in methanol and, after adding 10% Pd/C (10 mg, 0.075 mmol) and 4M HCl (two drops) and then injecting hydrogen (g), resulting mixture was stirred at room temperature for 18 hours. The reaction product was diluted with EA and then washed with purified water. Organic layer was dehydrated over Na 2 SO 4 , concentrated under reduced pressure, and then reaction product was separated by column chromatography, to obtain 5 mg of 4-(3-(1-amino-2-methylpropan-2-yl)phenyl)-2-(2,4-difluorophenyl)phthalazin-1(2H)-one in light brown solid. 
     LC-MS (ESI, m/z)=406.1 (M+H + ) 
     Step 2: The compound (5 mg, 0.012 mmol) obtained in Step 1 was reacted in the same manner as in Step 2 of Example 157, to obtain 1.1 mg of the title compound in light brown solid. 
     LC-MS (ESI, m/z)=406.1 (M+H + ) 
     Example 205: 2-(1-(3-(2,4-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)piperidin-3-yl)-2-methylpropanoic Acid 
     Step 1: Compound I-9 (100 mg, 0.246 mmol) and methyl 2-methyl-2-(piperidin-3-yl)propionate (91 mg, 0.492 mmol) were reacted in the same manner as in Example 157, to obtain 42.6 mg of methyl 2-(1-3-(2,4-difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)-2-methylpropionate in pale yellow solid. 
     LC-MS (ESI, m/z)=442.1 (M+H + ) 
     Step 2: The compound (42.6 mg, 0.096 mmol) obtained in Step 1 was reacted in the same manner as in Step 2 of Example 152, to obtain 6.2 mg of the title compound in pale yellow solid. 
     LC-MS (ESI, m/z)=428.1 (M+H + ) 
     Example 206: 2-(3-(3-(4-Cyclopropylphenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)-2-methylpropanoic Acid 
     Step 1: 4-Bromophthalazin-1(2H)-one (300 mg, 1.333 mmol) and (4-cyclopropylphenyl)boronic acid (324 mg, 2.0 mmol) were reacted in the same manner as in Example 128, to obtain 110 mg of 4-bromo-2-(4-cyclopropylphenyl)phthalazin-1(2H)-one in white solid. 
     LC-MS (ESI, m/z)=342.1 (M+H + ) 
     Step 2: The compound (110 mg, 0.322 mmol) obtained in Step 1 was reacted in the same manner as in Example 152, to obtain 62.8 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=425.1 (M+H + ) 
     Example 207: 1-(3-(3-(2,4-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)cyclobutane-1-carboxylic Acid 
     Compound I-9 (100 mg, 0.246 mmol) and methyl 1-(3-bromophenyl)cyclobutane-1-carboxylate (93 mg, 0.295 mmol) were reacted in the same manner as in Example 152, to obtain 76.3 mg of pale yellow title compound. 
     LC-MS (ESI, m/z)=433.0 (M+H + ) 
     Example 208: 1-(3-(3-(2,4-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)phenyl)cyclopentane-1-carboxylic Acid 
     Compound I-9 (100 mg, 0.246 mmol) and methyl 1-(3(4,4,5,5-tetramethyl-1,3,4-dioxaborolan-2-yl)phenyl)cyclopentane-1-carboxylate (98 mg, 0.295 mmol) were reacted in the same manner as in Example 152, to obtain 77.3 mg of the title compound in white solid. 
     LC-MS (ESI, m/z)=447.0 (M+H + ) 
     Example 209: 2-(1-(3-(4-Chlorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)piperidin-3-yl)-2-methylpropanoic Acid 
     The compound (100 mg, 0.247 mmol) of Example 195 and methyl 2-methyl-2-(piperidin-3-yl)propionate were reacted in the same manner as in Example 205, to obtain 3.5 mg of the title compound in pale pink solid. 
     LC-MS (ESI, m/z)=426.1 (M+H + ) 
     Examples 210-1 and 210-2: 2-(1-(3-(2,4-Difluoro phenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)piperidin-3-yl)-2-methylpropanoic Acid 
     Step 1: The compound (117 mg, 0.274 mmol) of Example 209 was dissolved in THF (0.55 mL) and, after adding hexafluorophosphate azabenzotriazole tetramethyl uronium (HATU; 114 mg, 0.301 mmol) and DIPEA (57.4 μL), resulting mixture was stirred at 35° C. for one hour. In another reaction vessel, 60% NaH washed with THF was diluted in THF (0.55 mL), a temperature was lowered to 0° C., and after adding (R)-4-benzyloxazolidin-2-one (150 mg, 0.849 mmol), resulting mixture was stirred for 30 minutes. The solution was added, at 0° C., to a mixed solution in which 2-(1-(3-(4-chlorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)piperidin-3-yl)-2-methylpropanoic acid is dissolved, and then stirred for one hour. The reaction product was extracted with EA and then washed three times with distilled water. Organic layer was dehydrated over Na 2 SO 4 , concentrated under reduced pressure, and then reaction product was separated by column chromatography, to obtain 56 mg of each of Compound a (up spot) and Compound b (down spot) ((5-benzyl-3-(2-(1-(3-(2,4-difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)piperidin-3-yl)-2-methylpropanoyl)oxazolidin-2-one)) in pale yellow solid. 
     LC-MS (ESI, m/z)=587.1 (M+H + ) 
     Step 2: Compound a (up spot) (24.9 mg, 0.042 mmol) obtained in Step 1 was dissolved in THF/water (4:1, 0.29 mL:0.07 mL) and, after adding 30% hydrogen peroxide (15.69 μL, 0.514 mmol) at 0° C., resulting mixture was stirred for one hour. After concentrating the reaction solution, water was added, and then pH was adjusted to 2 with 1N HCl. The reaction product was extracted with EA and washed with distilled water. Organic layer was dehydrated over Na 2 SO 4  and concentrated under reduced pressure, to obtain 7.9 mg of the compound of Example 210-1 in white solid. 
     LC-MS (ESI, m/z)=428.1 (M+H + ) Compound b (down spot) (32 mg, 0.055 mmol) obtained in Step 1 was used and reacted in the same manner as Compound a, to obtain 12.7 mg of the compound of Example 210-2 in white solid. 
     LC-MS (ESI, m/z)=428.1 (M+H + ) 
     Example 211: Methyl 1-(1-(3-(2,4-difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)piperidin-3-yl)cyclopropan-1-carboxylate 
     Compound I-9 (420 mg, 1.03 mmol), methyl 1-(piperidin-3-yl)cyclopropan-1-carboxylate hydrochloride (303 mg, 1.65 mmol) and DIPEA (0.36 ml, 2.07 mmol) were dissolved in THF (15 ml) and then stirred at 110° C. for 48 hours. The reaction product was diluted with EtOAc and washed with purified water. Organic layer was separated, dehydrated over anhydrous Na 2 SO 4 , concentrated under reduced pressure, and then reaction product was separated by column chromatography, to obtain 275 mg of the title compound. 
     LC-MS (ESI, m/z)=440.0 (M+H + ) 
     Example 212: 1-(1-(3-(2,4-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)piperidin-3-yl)cyclopropan-1-carboxylic Acid 
     The compound (100 mg, 0.23 mmol) of Example 211 was reacted in the same manner as in Step 2 of Example 152, to obtain 87 mg of the title compound. 
     LC-MS (ESI, m/z)=426.0 (M+H + ) 
     Examples 213-1 and 213-2: 1-(1-(3-(2,4-Difluoro phenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)piperidin-3-yl)cyclopropan-1-carboxylic Acid 
     The compound (163 mg, 0.383 mmol) of Example 212 was used and reacted in the same manner as in Example 210, to obtain 28.2 mg of a compound of Example 213-1 and 11.8 mg of a compound of Example 213-2 were obtained in white solids. 
     LC-MS (ESI, m/z)=426.1 (M+H + ) 
     Example 214: 2-(2,4-Difluorophenyl)-4-(3-(pyrrolidin-1-ylsulfonyl)phenyl)phthalazin-1(2H)-one 
     Compound I-9 (100 mg, 0.25 mmol), (3-(pyrrolidin-1-ylsulfonyl)phenyl)boronic acid (71 mg, 0.28 mmol), Pd(PPh 3 ) 4  (30 mg, 0.02 mmol) and Na 2 CO 3  (130 mg, 1.23 mmol) were added to 1,4-dioxane/distilled water (10 mL, 1:1 ratio), and then resulting mixture was stirred at 100° C. for five hours. The reaction product was diluted with EtOAc and washed with purified water. Organic layer was separated, dehydrated over anhydrous Na 2 SO 4 , concentrated under reduced pressure, and then reaction product was separated by column chromatography, to obtain 55 mg of the title compound. 
     LC-MS (ESI, m/z)=468.1 (M+H + ) 
     Example 215: 2-(2,4-Difluorophenyl)-4-(1,2,3,6-tetrahydropyridin-4-yl)phthalazin-1(2H)-one-hydrochloride 
     Step 1: Compound I-9 (100 mg, 0.25 mmol) and tert-butyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-3,6-dihydropyridin-1(2H)-carboxylate (92 mg, 0.30 mmol) were reacted in the same manner as in Example 214, to obtain 80 mg of tert-butyl-4-(3-(2,4-difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)-3,6-dihydropyridin-1(2H)-carboxylate. 
     LC-MS (ESI, m/z)=444.2 (M+H + ) 
     Step 2: The compound (70 mg, 0.16 mmol) obtained in Step 1 was reacted in the same manner as in Step 2 of Example 157, to obtain 50 mg of the title compound. 
     LC-MS (ESI, m/z)=340.2 (M+H + ) 
     Example 216: 3-(3-(2,4-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)-N-ethyl-N-methylbenzenesulfonamide 
     The compound (70 mg, 0.16 mmol) of Example 91 was dissolved in anhydrous MeCN (5 ml) and, after adding K 2 CO 3  (90 mg, 0.66 mmol) and bromoethane (20 μL, 0.33 mmol), resulting mixture was stirred at 90° C. for two hours. The reaction product was diluted with EtOAc and washed with purified water. Organic layer was separated, dehydrated over anhydrous Na 2 SO 4 , concentrated under reduced pressure, and then reaction product was separated by column chromatography, to obtain 66 mg of the title compound. 
     LC-MS (ESI, m/z)=456.5 (M+H + ) 
     Example 217: 3-(3-(2,4-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)-N,N-diethylbenzenesulfonamide 
     The compound (70 mg, 0.16 mmol) of Example 92 was used and reacted in the same manner as in Example 216, to obtain 65 mg of the title compound. 
     LC-MS (ESI, m/z)=470.5 (M+H + ) 
     Example 218: 2-(2,4-Difluorophenyl)-4-(1-(ethylsulfonyl)-1,2,3,6-tetrahydropyridin-4-yl)phthalazin-1(2H)-one 
     The compound (40 mg, 0.10 mmol) of Example 216 was dissolved in DCM (3 ml), and after adding ethane sulfonylchloride (20 mg, 0.16 mmol) and pyridine (18 μl, 0.21 mmol), resulting mixture was stirred at room temperature for four hours. The reaction product was diluted with EtOAc and washed with purified water. Organic layer was separated, dehydrated over anhydrous Na 2 SO 4 , concentrated under reduced pressure, and then reaction product was separated by column chromatography, to obtain 35 mg of the title compound. 
     LC-MS (ESI, m/z)=432.1 (M+H + ) 
     Example 219: 2-(4-(3-(2,4-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)piperazin-2-yl)-2-methylpropanoic Acid 
     Step 1: Compound I-9 (200 mg, 0.50 mmol) and Compound I-16 (100 mg, 0.54 mmol) were reacted in a manner similar to Example 212, to obtain 130 mg of methyl 2-(4-(3-(2,4-difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)piperazin-2-yl)-2-methylpropionate. 
     LC-MS (ESI, m/z)=443.1 (M+H + ) 
     Step 2: The compound (40 mg, 0.09 mmol) obtained in Step 1 was dissolved in THF/MeOH/H 2 O (4 mL, 3:1:1 ratio) and, after adding LiOH—H 2 O (11 mg, 0.27 mmol), resulting mixture was stirred at room temperature for five hours. The reaction product was diluted with EtOAc and washed with saturated aqueous NH 4 Cl solution. Organic layer was separated, dehydrated over anhydrous Na 2 SO 4 , and concentrated under reduced pressure, to obtain 16 mg of the title compound. 
     LC-MS (ESI, m/z)=429.2 (M+H + ) 
     Example 220: 2-(4-(3-(2,4-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)-1-methylpiperazin-2-yl)-2-methylpropanoic Acid 
     Step 1: The compound (80 mg, 0.18 mmol) obtained in Step 1 of Example 219 was dissolved in 1,4-dixoane (5 ml) and, after adding iodomethane (20 μl, 0.27 mmol) and K 2 CO 3  (75 mg, 0.54 mmol), resulting mixture was stirred at room temperature for four hours. The reaction product was diluted with EtOAc and washed with purified water. Organic layer was separated, dehydrated over anhydrous Na 2 SO 4  and concentrated under reduced pressure, and then reaction product was separated by column chromatography, to obtain 65 mg of methyl 2-(4-(3-(2,4-difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)-1-methylpiperazin-2-yl)-2-methylpropionate. 
     LC-MS (ESI, m/z)=457.1 (M+H + ) 
     Step 2: The compound (65 mg, 0.14 mmol) obtained in Step 1 was reacted in the same manner as in Step 2 of Example 219, to obtain 46 mg of the title compound. 
     LC-MS (ESI, m/z)=443.2 (M+H + ) 
     Example 221: 2-(4-(3-(2,4-Difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)morpholin-2-yl)-2-methylpropanoic Acid 
     Step 1: Compound I-9 (500 mg, 1.23 mmol) and methyl 2-(morpholin-2-yl)acetate (265 mg, 1.35 mmol) were reacted in the same manner as in Example 211, to obtain 360 mg of methyl 2-(4-(3-(2,4-difluorophenyl)-4-oxo-3,4-dihydro phthalazin-1-yl)morpholin-2-yl)acetate. 
     LC-MS (ESI, m/z)=416.1 (M+H + ) 
     Step 2: The compound (250 mg, 0.60 mmol) obtained in Step 1 was reacted in the same manner as in Step 2 of Preparation Example 5, to obtain 120 mg of methyl 2-(4-(3-(2,4-difluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)morpholin-2-yl)-2-methylpropionate. 
     LC-MS (ESI, m/z)=444.1 (M+H + ) 
     Step 3: The compound (70 mg, 0.16 mmol) obtained in Step 2 was reacted in the same manner as in Step 2 of Example 219, to obtain 16 mg of the title compound. 
     LC-MS (ESI, m/z)=430.1 (M+H + ) Experimental Example 1: Measurement of Sirt6 Activity Compounds having Sirt6 activity were selected using a CycLex Sirt6 Deacetylase Fluorometric Assay Kit (cat. CY-1156V2) manufactured by CycLex. 
     When a fluorescent-attached acetylated lysine substrate is treated with Sirt6 enzyme, Sirt6 deacetylates the acetylated lysine of the substrate and lysylendopeptidase cleaves the C-terminal peptide bond connected to the lysine, by which fluorescence is emitted. The activity of a compound is calculated by observing the intensity of fluorescence when the compound is treated along with Sirt6 enzyme. When treating the compound, the compound aids in the activity of Sirt6 enzyme, so as to result in stronger fluorescence. Therefore, by calculating the ratio of the stronger fluorescence relative to the fluorescence emitted from the group without compound treatment (i.e., positive control group), relative activity can be calculated. 
     Activity evaluation was performed according to the following procedure. 
     The compound whose activity is to be evaluated was prepared by diluting in phosphate-buffered saline (PBS) to 10 times of the desired concentration (e.g., when measuring Sirt6 assay activity at 10 μM, the compound is prepared at a concentration of 100 μM in PBS). 1 μL of a 1 Ox Sirt6 assay buffer, 0.8 μL of 50× fluoro-substrate peptide, 1 μL of nicotinamide adenine dinucleotide (NAD), 1 μL of a developer and 4.2 μL of H 2 O were mixed to prepare mixtures equal to the number of samples, and 8 μL was dispensed into each Black 384 well. An additional 1 μL of PBS was added to each of a “no enzyme group” and a positive control group, and 1 μL of the compound diluted in PBS was added to an activity evaluation group. Recombinant Sirt6 was 1:8 diluted in a 1×Sirt6 assay buffer, and 1 μL thereof was added to each of the positive control group and the activity evaluation group. 1 μL of the 1×Sirt6 assay buffer was added to the “no enzyme group.” After reacting at room temperature for one hour, results were measured with a fluorescence spectrometer (excitation: 490±10 nm, emission: 530±10 nm) to confirm the presence or absence of Sirt6 activity and measure the intensity of the activity. 
     Table 1 below summarizes the names and Sirt6 activity of compounds according to Examples of the present invention. 
     
       
         
           
               
               
               
             
               
                 TABLE 1 
               
               
                   
               
               
                   
                   
                 Sirt6 Activity 
               
               
                 Example 
                   
                 (% activity, 
               
               
                 No. 
                 Compound Name 
                 10 μM) 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
            
               
                  1 
                 N-(3-(4-oxo-3-phenyl-3,4-dihydrophthalazin-1- 
                 170 
               
               
                   
                 yl)phenyl)ethanesulfonamide 
               
               
                  2 
                 4-(3-aminophenyl)-2-(4- 
                 88 
               
               
                   
                 (trifluoromethyl)phenyl)phthalazin-1(2H)-one 
               
               
                  3 
                 N-(3-(4-oxo-3-(4-(trifluoromethyl)phenyl)-3,4- 
                 104 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)ethanesulfonamide 
               
               
                  4 
                 4-(3-(ethylamino)phenyl)-2-(4- 
                 102 
               
               
                   
                 (trifluoromethyl)phenyl)phthalazin-1(2H)-one 
               
               
                  5 
                 N-methyl-N-(3-(4-oxo-3-(4-(trifluoromethyl)phenyl)-3,4- 
                 105 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)ethanesulfonamide 
               
               
                  6 
                 N-(3-(4-oxo-3-phenyl-3,4-dihydrophthalazin-1- 
                 102 
               
               
                   
                 yl)phenyl)methanesulfonamide 
               
               
                  7 
                 N-methyl-N-(3-(4-oxo-3-phenyl-3,4-dihydrophthalazin- 
                 173 
               
               
                   
                 1-yl)phenyl)methanesulfonamide 
               
               
                  8 
                 N-(4-(4-oxo-3-phenyl-3,4-dihydrophthalazin-1- 
                 100 
               
               
                   
                 yl)phenyl)ethanesulfonamide 
               
               
                  9 
                 N-(3-(3-phenyl)-4-oxo-3,4-dihydrophthalazin-1- 
                 154 
               
               
                   
                 yl)phenyl)-dimethylsulfamoylamide 
               
               
                  10 
                 N-(3-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1- 
                 198 
               
               
                   
                 yl)phenyl)methanesulfonamide 
               
               
                  11 
                 N-(3-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1- 
                 162 
               
               
                   
                 yl)phenyl)ethanesulfonamide 
               
               
                  12 
                 N-(3-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1- 
                 189 
               
               
                   
                 yl)phenyl)-dimethylsulfamoylamide 
               
               
                  13 
                 (Z)-N-methyl-1-(3-(4-oxo-3-phenyl-3,4- 
                 181 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)methanimine oxide 
               
               
                  14 
                 (Z)-N-isopropyl-1-(3-(4-oxo-3-phenyl-3,4- 
                 121 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)methanimine oxide 
               
               
                  15 
                 (Z)-1-(3-(3-(4-fluorophenyl)-4-oxo-3,4- 
                 231 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)-N-methylmethanimine 
               
               
                   
                 oxide 
               
               
                  16 
                 (Z)-N-ethyl-1-(3-(3-(4-fluorophenyl)-4-oxo-3,4- 
                 221 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)methanimine oxide 
               
               
                  17 
                 (Z)-1-(3-(3-(4-fluorophenyl)-4-oxo-3,4- 
                 207 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)-N-isopropylmethanimine 
               
               
                   
                 oxide 
               
               
                  18 
                 N-(2-chloro-5-(4-oxo-3-phenyl-3,4-dihydrophthalazin-1- 
                 114 
               
               
                   
                 yl)phenyl)-N-(methylsulfonyl)methanesulfonamide 
               
               
                  19 
                 N-(3-(3-(phenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)-6- 
                 120 
               
               
                   
                 chlorophenyl)-dimethylsulfamoylamide 
               
               
                  20 
                 methyl (N-(3-(3-(4-fluorophenyl)-4-oxo-3,4- 
                 211 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)sulfamoyl)carbamate 
               
               
                  21 
                 (Z)-1-(3-(3-(2,4-difluorophenyl)-4-oxo-3,4- 
                 167 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)-N-methylmethanimine 
               
               
                   
                 oxide 
               
               
                  22 
                 (Z)-1-(3-(3-(2,4-difluorophenyl)-4-oxo-3,4- 
                 201 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)-N-isopropylmethanimine 
               
               
                   
                 oxide 
               
               
                  23 
                 (Z)-N-tert-butyl-1-(3-(3-(2,4-difluorophenyl)-4-oxo-3,4- 
                 192 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)methanimine oxide 
               
               
                  24 
                 4-(3-aminophenyl)-2-(2,4-difluorophenyl)phthalazin- 
                 147 
               
               
                   
                 1(2H)-one 
               
               
                  25 
                 N-(3-(3-(2,4-difluorophenyl)-4-oxo-3,4- 
                 147 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)ethanesulfonamide 
               
               
                  26 
                 methyl(N-(3-(3-(2,4-difluorophenyl)-4-oxo-3,4- 
                 180 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)sulfamoyl)carbamate 
               
               
                  27 
                 (Z)-1-(3-(3-(3-fluorophenyl)-4-oxo-3,4- 
                 148 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)-N-methylmethanimine 
               
               
                   
                 oxide 
               
               
                  28 
                 (Z)-1-(3-(3-(3-fluorophenyl)-4-oxo-3,4- 
                 154 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)-N-isopropylmethanimine 
               
               
                   
                 oxide 
               
               
                  29 
                 (Z)-N-tert-butyl-1-(3-(3-(3-fluorophenyl)-4-oxo-3,4- 
                 162 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)methanimine oxide 
               
               
                  30 
                 N-(3-(3-(3-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1- 
                 117 
               
               
                   
                 yl)phenyl)ethanesulfonamide 
               
               
                  31 
                 (Z)-1-(3-(3-(3,5-difluorophenyl)-4-oxo-3,4- 
                 171 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)-N-isopropylmethanimine 
               
               
                   
                 oxide 
               
               
                  32 
                 (Z)-N-isopropyl-1-(3-(3-(4-methoxyphenyl)-4-oxo-3,4- 
                 124 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)methanimine oxide 
               
               
                  33 
                 (Z)-1-(3-(3-(3-chloro-4-fluorophenyl)-4-oxo-3,4- 
                 183 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)-N-isopropylmethanimine 
               
               
                   
                 oxide 
               
               
                  34 
                 (Z)-N-tert-butyl-1-(3-(3-(3-chloro-4-fluorophenyl)-4-oxo- 
                 176 
               
               
                   
                 3,4-dihydrophthalazin-1-yl)phenyl)methanimine oxide 
               
               
                  35 
                 (Z)-N-benzyll-1-(3-(4-oxo-3-phenyl-3,4- 
                 113 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)methanimine oxide 
               
               
                  36 
                 (E)-1-(4-(3-(4-fluorophenyl)-4-oxo-3,4- 
                 142 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)-N-methylmethanimine 
               
               
                   
                 oxide 
               
               
                  37 
                 (Z)-1-(3-(3-(4-fluorophenyl)-4-oxo-3,4- 
                 126 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)-N-isopropylmethanimine 
               
               
                   
                 oxide 
               
               
                  38 
                 (E)-1-(3-fluoro-4-(3-(4-fluorophenyl)-4-oxo-3,4- 
                 143 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)-N-methylmethanimine 
               
               
                   
                 oxide 
               
               
                  39 
                 (E)-1-(3-fluoro-4-(3-(4-fluorophenyl)-4-oxo-3,4- 
                 106 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)-N-isopropylmethanimine 
               
               
                   
                 oxide 
               
               
                  40 
                 (Z)-1-(2-(3-(4-fluorophenyl)-4-oxo-3,4- 
                 160 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)-N-methylmethanimine 
               
               
                   
                 oxide 
               
               
                  41 
                 (Z)-1-(2-(3-(4-fluorophenyl)-4-oxo-3,4- 
                 129 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)-N-isopropylmethanimine 
               
               
                   
                 oxide 
               
               
                  42 
                 (Z)-N-tert-butyl-1-(2-(3-(4-fluorophenyl)-4-oxo-3,4- 
                 161 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)methanimine oxide 
               
               
                  43 
                 (Z)-N-tert-butyl-1-(3-(3-(4-fluorophenyl)-4-oxo-3,4- 
                 205 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)methanimine oxide 
               
               
                  44 
                 (Z)-N-benzyl-1-(3-(3-(4-fluorophenyl)-4-oxo-3,4- 
                 142 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)methanimine oxide 
               
               
                  45 
                 (Z)-1-(5-(3-(4-fluorophenyl)-4-oxo-3,4- 
                 195 
               
               
                   
                 dihydrophthalazin-1-yl)thiophen-2-yl)-N- 
               
               
                   
                 methylmethanimine oxide 
               
               
                  46 
                 (Z)-1-(5-(3-(4-fluorophenyl)-4-oxo-3,4- 
                 154 
               
               
                   
                 dihydrophthalazin-1-yl)thiophen-2-yl)-N- 
               
               
                   
                 isopropylmethanimine oxide 
               
               
                  47 
                 (Z)-N-tert-butyl-1-(5-(3-(4-fluorophenyl)-4-oxo-3,4- 
                 132 
               
               
                   
                 dihydrophthalazin-1-yl)thiophen-2-yl)methanimine oxide 
               
               
                  48 
                 (Z)-1-(5-(3-(4-fluorophenyl)-4-oxo-3,4- 
                 107 
               
               
                   
                 dihydrophthalazin-1-yl)furan-2-yl)-N- 
               
               
                   
                 isopropylmethanimine oxide 
               
               
                  49 
                 (Z)-N-tert-butyl-1-(5-(3-(4-fluorophenyl)-4-oxo-3,4- 
                 107 
               
               
                   
                 dihydrophthalazin-1-yl)-2-methoxyphenyl)methanimine 
               
               
                   
                 oxide 
               
               
                  50 
                 (Z)-N-benzyl-1-(5-(3-(4-fluorophenyl)-4-oxo-3,4- 
                 105 
               
               
                   
                 dihydrophthalazin-1-yl)-2-methoxyphenyl)methanimine 
               
               
                   
                 oxide 
               
               
                  51 
                 (Z)-1-(2-fluoro-5-(3-(4-fluorophenyl)-4-oxo-3,4- 
                 139 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)-N-methylmethanimine 
               
               
                   
                 oxide 
               
               
                  52 
                 (Z)-1-(2-fluoro-5-(3-(4-fluorophenyl)-4-oxo-3,4- 
                 172 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)-N-isopropylmethanimine 
               
               
                   
                 oxide 
               
               
                  53 
                 (Z)-N-tert-butyl-1-(2-fluoro-5-(3-(4-fluorophenyl)-4-oxo- 
                 172 
               
               
                   
                 3,4-dihydrophthalazin-1-yl)phenyl)methanimine oxide 
               
               
                  54 
                 (Z)-N-benzyl-1-(2-fluoro-5-(3-(4-fluorophenyl)-4-oxo- 
                 161 
               
               
                   
                 3,4-dihydrophthalazin-1-yl)phenyl)methanimine oxide 
               
               
                  55 
                 (Z)-1-(4-fluoro-3-(3-(4-fluorophenyl)-4-oxo-3,4- 
                 151 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)-N-methylmethanimine 
               
               
                   
                 oxide 
               
               
                  56 
                 (Z)-1-(4-fluoro-3-(3-(4-fluorophenyl)-4-oxo-3,4- 
                 115 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)-N-isopropylmethanimine 
               
               
                   
                 oxide 
               
               
                  57 
                 (Z)-N-tert-butyl-1-(4-fluoro-3-(3-(4-fluorophenyl)-4-oxo- 
                 149 
               
               
                   
                 3,4-dihydrophthalazin-1-yl)phenyl)methanimine oxide 
               
               
                  58 
                 (Z)-N-benzyl-1-(4-fluoro-3-(3-(4-fluorophenyl)-4-oxo- 
                 131 
               
               
                   
                 3,4-dihydrophthalazin-1-yl)phenyl)methanimine oxide 
               
               
                  59 
                 4-(4-chloro-3-nitrophenyl)-2-(4-fluorophenyl)phthalazin- 
                 109 
               
               
                   
                 1(2H)-one 
               
               
                  60 
                 4-(3-aminophenyl)-2-(4-fluorophenyl)phthalazin-1(2H)- 
                 176 
               
               
                   
                 one 
               
               
                  61 
                 N-(3-(3-benzyl-4-oxo-3,4-dihydrophthalazin-1- 
                 104 
               
               
                   
                 yl)phenyl)ethanesulfonamide 
               
               
                  62 
                 N-(3-(4-oxo-3-phenethyl-3,4-dihydrophthalazin-1- 
                 111 
               
               
                   
                 yl)phenyl)ethanesulfonamide 
               
               
                  63 
                 N-(3-(3-(4-fluorobenzyl)-4-oxo-3,4-dihydrophthalazin-1- 
                 103 
               
               
                   
                 yl)phenyl)ethanesulfonamide 
               
               
                  64 
                 N-(3-(3-([1,1′-biphenyl]-4-yl)-4-oxo-3,4- 
                 106 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)ethanesulfonamide 
               
               
                  65 
                 N-(3-(3-([1,1′-biphenyl]-4-yl)-4-oxo-3,4- 
                 96 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)-N- 
               
               
                   
                 methylethanesulfonamide 
               
               
                  66 
                 methyl 3-(3-(4-fluorophenyl)-4-oxo-3,4- 
                 103 
               
               
                   
                 dihydrophthalazin-1-yl)benzoate 
               
               
                  67 
                 N-(3-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1- 
                 166 
               
               
                   
                 yl)phenyl)propan-2-sulfonamide 
               
               
                  68 
                 N-(3-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1- 
                 160 
               
               
                   
                 yl)phenyl)propan-1-sulfonamide 
               
               
                  69 
                 N-(3-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1- 
                 209 
               
               
                   
                 yl)phenyl)-N-methylmethanesulfonamide 
               
               
                  70 
                 N-(3-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1- 
                 135 
               
               
                   
                 yl)phenyl)-N-methylethanesulfonamide 
               
               
                  71 
                 N-(3-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1- 
                 150 
               
               
                   
                 yl)phenyl)cyclopropanesulfonamide 
               
               
                  72 
                 N-(3-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1- 
                 115 
               
               
                   
                 yl)phenyl)-N-methylpropan-1-sulfonamide 
               
               
                  73 
                 N-(3-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1- 
                 124 
               
               
                   
                 yl)phenyl)-N-methylpropan-2-sulfonamide 
               
               
                  74 
                 N-(3-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1- 
                 128 
               
               
                   
                 yl)phenyl)-N-methylcyclopropanesulfonamide 
               
               
                  75 
                 N-(3-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1- 
                 139 
               
               
                   
                 yl)phenyl)-N-methyl-dimethylsulfamoylamide 
               
               
                  76 
                 methyl (N-(3-(3-(4-fluorophenyl)-4-oxo-3,4- 
                 125 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)-N- 
               
               
                   
                 methylsulfamoyl)(methyl)carbamate 
               
               
                  77 
                 1,1,1-trifluoro-N-(3-(3-(4-fluorophenyl)-4-oxo-3,4- 
                 194 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)methanesulfonamide 
               
               
                  78 
                 1,1,1-trifluoro-N-(3-(3-(4-fluorophenyl)-4-oxo-3,4- 
                 122 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)-N- 
               
               
                   
                 methylmethanesulfonamide 
               
               
                  79 
                 3-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)- 
                 167 
               
               
                   
                 N-((tetrahydro-2H-pyran-2-yl)oxy)benzamide 
               
               
                  80 
                 N-(3-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1- 
                 216 
               
               
                   
                 yl)phenyl)-N-methyl-methylsulfamoylamide 
               
               
                  81 
                 4-(3-(1H-tetrazol-5-yl)phenyl)-2-(4- 
                 115 
               
               
                   
                 fluorophenyl)phthalazin-1(2H)-one 
               
               
                  82 
                 N-(5-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1- 
                 111 
               
               
                   
                 yl)pyridin-3-yl)ethanesulfonamide 
               
               
                  83 
                 3-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)- 
                 162 
               
               
                   
                 N-hydroxybenzamide 
               
               
                  84 
                 (Z)-1-(3-(3-([1,1′-biphenyl]-4-yl)-4-oxo-3,4- 
                 123 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)-N-methylmethanimine 
               
               
                   
                 oxide 
               
               
                  85 
                 (Z)-1-(3-(3-([1,1′-biphenyl]-4-yl)-4-oxo-3,4- 
                 118 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)-N-isopropylmethanimine 
               
               
                   
                 oxide 
               
               
                  86 
                 3-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)- 
                 196 
               
               
                   
                 N-methylbenzenesulfonamide 
               
               
                  87 
                 N-ethyl-3-(3-(4-fluorophenyl)-4-oxo-3,4- 
                 226 
               
               
                   
                 dihydrophthalazin-1-yl)benzenesulfonamide 
               
               
                  88 
                 3-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)- 
                 180 
               
               
                   
                 N,N-dimethylbenzenesulfonamide 
               
               
                  89 
                 2-(2,4-difluorophenyl)-4-(3- 
                 339 
               
               
                   
                 (methylsulfonyl)phenyl)phthalazin-1(2H)-one 
               
               
                  90 
                 2-(2,4-difluorophenyl)-4-(3- 
                 283 
               
               
                   
                 (ethylsulfonyl)phenyl)phthalazin-1(2H)-one 
               
               
                  91 
                 3-(3-(2,4-difluorophenyl)-4-oxo-3,4-dihydrophthalazin- 
                 272 
               
               
                   
                 1-yl)-N-methylbenzenesulfonamide 
               
               
                  92 
                 3-(3-(2,4-difluorophenyl)-4-oxo-3,4-dihydrophthalazin- 
                 208 
               
               
                   
                 1-yl)-N-ethylbenzenesulfonamide 
               
               
                  93 
                 3-(3-(2,4-difluorophenyl)-4-oxo-3,4-dihydrophthalazin- 
                 227 
               
               
                   
                 1-yl)-N,N-dimethylbenzenesulfonamide 
               
               
                  94 
                 (Z)-1-(3-(3-(2-fluorophenyl)-4-oxo-3,4- 
                 272 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)-N-methylmethanimine 
               
               
                   
                 oxide 
               
               
                  95 
                 (Z)-1-(3-(3-(2-fluorophenyl)-4-oxo-3,4- 
                 133 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)-N-isopropylmethanimine 
               
               
                   
                 oxide 
               
               
                  96 
                 (Z)-N-tert-butyl-1-(3-(3-(2-fluorophenyl)-4-oxo-3,4- 
                 176 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)methanimine oxide 
               
               
                  97 
                 2-(2-fluorophenyl)-4-(3- 
                 286 
               
               
                   
                 (methylsulfonyl)phenyl)phthalazin-1(2H)-one 
               
               
                  98 
                 4-(3-(ethylsulfonyl)phenyl)-2-(2- 
                 264 
               
               
                   
                 fluorophenyl)phthalazin-1(2H)-one 
               
               
                  99 
                 3-(3-(2-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)- 
                 259 
               
               
                   
                 N-methylbenzenesulfonamide 
               
               
                 100 
                 N-ethyl-3-(3-(2-fluorophenyl)-4-oxo-3,4- 
                 196 
               
               
                   
                 dihydrophthalazin-1-yl)benzenesulfonamide 
               
               
                 101 
                 3-(3-(2-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1-yl)- 
                 153 
               
               
                   
                 N,N-dimethylbenzenesulfonamide 
               
               
                 102 
                 (Z)-1-(3-(3-(2,6-difluorophenyl)-4-oxo-3,4- 
                 206 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)-N-methylmethanimine 
               
               
                   
                 oxide 
               
               
                 103 
                 (Z)-1-(3-(3-(2,6-difluorophenyl)-4-oxo-3,4- 
                 324 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)-N-isopropylmethanimine 
               
               
                   
                 oxide 
               
               
                 104 
                 (Z)-N-tert-butyl-1-(3-(3-(2,6-difluorophenyl)-4-oxo-3,4- 
                 284 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)methanimine oxide 
               
               
                 105 
                 2-(2,6-difluorophenyl)-4-(3- 
                 226 
               
               
                   
                 (methylsulfonyl)phenyl)phthalazin-1(2H)-one 
               
               
                 106 
                 2-(2,6-difluorophenyl)-4-(3- 
                 141 
               
               
                   
                 (ethylsulfonyl)phenyl)phthalazin-1(2H)-one 
               
               
                 107 
                 3-(3-(2,6-difluorophenyl)-4-oxo-3,4-dihydrophthalazin- 
                 233 
               
               
                   
                 1-yl)-N-methylbenzenesulfonamide 
               
               
                 108 
                 3-(3-(2,6-difluorophenyl)-4-oxo-3,4-dihydrophthalazin- 
                 209 
               
               
                   
                 1-yl)-N-ethylbenzenesulfonamide 
               
               
                 109 
                 3-(3-(2,6-difluorophenyl)-4-oxo-3,4-dihydrophthalazin- 
                 188 
               
               
                   
                 1-yl)-N,N-dimethylbenzenesulfonamide 
               
               
                 110 
                 6-fluoro-4-(3-(methylsulfonyl)phenyl)-2- 
                 129 
               
               
                   
                 phenylphthalazin-1(2H)-one 
               
               
                 111 
                 3-(7-fluoro-4-oxo-3-phenyl-3,4-dihydrophthalazin-1-yl)- 
                 126 
               
               
                   
                 N-methylbenzenesulfonamide 
               
               
                 112 
                 7-fluoro-4-(3-(methylsulfonyl)phenyl)-2- 
                 103 
               
               
                   
                 phenylphthalazin-1(2H)-one 
               
               
                 113 
                 3-(6-fluoro-4-oxo-3-phenyl-3,4-dihydrophthalazin-1-yl)- 
                 116 
               
               
                   
                 N-methylbenzenesulfonamide 
               
               
                 114 
                 3-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1- 
                 226 
               
               
                   
                 yl)pyridine 1-oxide 
               
               
                 115 
                 2-(2,4-difluorophenyl)-4-(pyridin-3-yl)phthalazin-1(2H)- 
                 405 
               
               
                   
                 one 
               
               
                 116 
                 2-(2,6-difluorophenyl)-4-(pyridin-3-yl)phthalazin-1(2H)- 
                 227 
               
               
                   
                 one 
               
               
                 117 
                 3-(3-(2,4-difluorophenyl)-4-oxo-3,4-dihydrophthalazin- 
                 318 
               
               
                   
                 1-yl)pyridine 1-oxide 
               
               
                 118 
                 3-(3-(2,6-difluorophenyl)-4-oxo-3,4-dihydrophthalazin- 
                 231 
               
               
                   
                 1-yl)pyridine 1-oxide 
               
               
                 119 
                 2-(2,4-difluorophenyl)-6-fluoro-4-(3- 
                 166 
               
               
                   
                 (methylsulfonyl)phenyl)phthalazin-1(2H)-one 
               
               
                 120 
                 2-(2,4-difluorophenyl)-7-fluoro-4-(3- 
                 178 
               
               
                   
                 (methylsulfonyl)phenyl)phthalazin-1(2H)-one 
               
               
                 121 
                 3-(3-(2,4-difluorophenyl)-7-fluoro-4-oxo-3,4- 
                 157 
               
               
                   
                 dihydrophthalazin-1-yl)-N-methylbenzenesulfonamide 
               
               
                 122 
                 3-(3-(2,4-difluorophenyl)-6-fluoro-4-oxo-3,4- 
                 177 
               
               
                   
                 dihydrophthalazin-1-yl)-N-methylbenzenesulfonamide 
               
               
                 123 
                 2-(2,4-difluorophenyl)-4-(3-(ethylsulfonyl)phenyl)-6- 
                 253 
               
               
                   
                 fluorophthalazin-1(2H)-one 
               
               
                 124 
                 3-(3-(2,4-difluorophenyl)-7-fluoro-4-oxo-3,4- 
                 146 
               
               
                   
                 dihydrophthalazin-1-yl)-N-ethylbenzenesulfonamide 
               
               
                 125 
                 3-(3-(2,4-difluorophenyl)-7-fluoro-4-oxo-3,4- 
                 172 
               
               
                   
                 dihydrophthalazin-1-yl)-N,N- 
               
               
                   
                 dimethylbenzenesulfonamide 
               
               
                 126 
                 3-(3-(2,4-difluorophenyl)-4-oxo-3,4-dihydrophthalazin- 
                 185 
               
               
                   
                 1-yl)benzenesulfonamide 
               
               
                 127 
                 3-(3-(2,4-difluorophenyl)-4-oxo-3,4-dihydrophthalazin- 
                 321 
               
               
                   
                 1-yl)-N-(2-hydroxyethyl)benzenesulfonamide 
               
               
                 128 
                 N-(3-(3-cyclohexyl-4-oxo-3,4-dihydrophthalazin-1- 
                 177.53 
               
               
                   
                 yl)phenyl)ethanesulfonamide 
               
               
                 129 
                 N-(3-(3-(1-methylpiperidin-4-yl)-4-oxo-3,4- 
                 104.16 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)ethanesulfonamide 
               
               
                 130 
                 3-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1- 
                 120.16 
               
               
                   
                 yl)benzonitrile 
               
               
                 131 
                 (E)-3-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin- 
                 102.08 
               
               
                   
                 1-yl)-N′-hydroxybenzimideamide 
               
               
                 132 
                 N-(3-(3-isopropyl-4-oxo-3,4-dihydrophthalazin-1- 
                 107.58 
               
               
                   
                 yl)phenyl)ethanesulfonamide 
               
               
                 133 
                 N-(3-(3-(1-methyl-1H-pyrazol-4-yl)-4-oxo-3,4- 
                 118.8 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)ethanesulfonamide 
               
               
                 134 
                 4-(3-aminopiperidin-1-yl)-2-(4-fluorophenyl)phthalazin- 
                 167.53 
               
               
                   
                 1(2H)-one•hydrochloride 
               
               
                 135 
                 N-(1-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1- 
                 174.93 
               
               
                   
                 yl)piperidin-3-yl)ethanesulfonamide 
               
               
                 136 
                 N-(3-(3-(oxetan-3-yl)-4-oxo-3,4-dihydrophthalazin-1- 
                 101.27 
               
               
                   
                 yl)phenyl)ethanesulfonamide 
               
               
                 137 
                 N-(1-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1- 
                 112.58 
               
               
                   
                 yl)pyrrolidin3-yl)ethanesulfonamide 
               
               
                 138 
                 (S)-N-(1-(3-(4-fluorophenyl)-4-oxo-3,4- 
                 175.98 
               
               
                   
                 dihydrophthalazin-1-yl)piperidin-3-yl)ethanesulfonamide 
               
               
                 139 
                 (R)-N-(1-(3-(4-fluorophenyl)-4-oxo-3,4- 
                 130.07 
               
               
                   
                 dihydrophthalazin-1-yl)piperidin-3-yl)ethanesulfonamide 
               
               
                 140 
                 N-(3-(3-(4,4-difluorocyclohexyl)-4-oxo-3,4- 
                 134.41 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)ethanesulfonamide 
               
               
                 141 
                 N-(1-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1- 
                 212.55 
               
               
                   
                 yl)azepan-3-yl)ethanesulfonamide 
               
               
                 142 
                 3-(3-cyclohexyl-4-oxo-3,4-dihydrophthalazin-1- 
                 162.3 
               
               
                   
                 yl)benzenesulfonamide 
               
               
                 143 
                 4-(3-aminoazepan-1-yl)-2-cyclohexylphthalazin-1(2H)- 
                 238.3 
               
               
                   
                 one•hydrochloride 
               
               
                 144 
                 N-(1-(3-cyclohexyl-4-oxo-3,4-dihydrophthalazin-1- 
                 164.1 
               
               
                   
                 yl)azepan-3-yl)ethanesulfonamide 
               
               
                 145 
                 N-(3-(3-(4-methylcyclohexyl)-4-oxo-3,4- 
                 136.6 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)ethanesulfonamide 
               
               
                 146 
                 (S)-4-(3-aminopiperidin-1-yl)-2-cyclohexylphthalazin- 
                 135.2 
               
               
                   
                 1(2H)-one•hydrochloride 
               
               
                 147 
                 (S)-N-(1-(3-cyclohexyl-4-oxo-3,4-dihydrophthalazin-1- 
                 127.7 
               
               
                   
                 yl)piperidin-3-yl)ethanesulfonamide 
               
               
                 148 
                 4-(3-aminoazepan-1-yl)-2-(4-fluorophenyl)phthalazin- 
                 184.3 
               
               
                   
                 1(2H)-one•hydrochloride 
               
               
                 149 
                 N-(3-(2-(4-fluorophenyl)-1-oxo-1,2-dihydropyrido[3,4- 
                 114.9 
               
               
                   
                 d]pyridin-4-yl)phenyl)ethanesulfonamide 
               
               
                 150 
                 N-(3-(3-(4-fluorophenyl)-8-methyl-4-oxo-3,4- 
                 104.7 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)ethanesulfonamide 
               
               
                 151 
                 N-(3-(4-oxo-3-(tetrahydro-2H-pyran-4-yl)-3,4- 
                 145.64 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)ethanesulfonamide 
               
               
                 152 
                 2-(3-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1- 
                 195.5 
               
               
                   
                 yl)phenyl)-2-methylpropanoic acid 
               
               
                 153 
                 2-(3-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1- 
                 280.4 
               
               
                   
                 yl)phenyl)-N,2-dimethylpropanamide 
               
               
                 154 
                 2-cyclohexyl-4-(3-(methylsulfonyl)phenyl)phthalazin- 
                 263.7 
               
               
                   
                 1(2H)-one 
               
               
                 155 
                 (S)-4-(3-aminoazepan-1-yl)-2-cyclohexylphthalazin- 
                 230.9 
               
               
                   
                 1(2H)-one•hydrochloride 
               
               
                 156 
                 (S)-2-cyclohexyl-4-(3-(methylamino)azepan-1- 
                 223.9 
               
               
                   
                 yl)phthalazin-1(2H)-one•hydrochloride 
               
               
                 157 
                 (S)-4-(3-aminoazepan-1-yl)-2-(2,4- 
                 244.1 
               
               
                   
                 difluorophenyl)phthalazin-1(2H)-one•hydrochloride 
               
               
                 158 
                 (S)-4-(3-aminoazepan-1-yl)-2-(4- 
                 164.7 
               
               
                   
                 fluorophenyl)phthalazin-1(2H)-one•hydrochloride 
               
               
                 159 
                 (R)-4-(3-aminoazepan-1-yl)-2-cyclohexylphthalazin- 
                 398.8 
               
               
                   
                 1(2H)-one•hydrochloride 
               
               
                 160 
                 2-(3-(3-cyclohexyl-4-oxo-3,4-dihydrophthalazin-1- 
                 289.8 
               
               
                   
                 yl)phenyl)-2-methylpropanoic acid 
               
               
                 161 
                 3-(3-(3-(4-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1- 
                 177 
               
               
                   
                 yl)phenyl)oxazolidin-2-one 
               
               
                 162 
                 (R)-4-(3-aminoazepan-1-yl)-2-(4- 
                 205.5 
               
               
                   
                 fluorophenyl)phthalazin-1(2H)-one•hydrochloride 
               
               
                 163 
                 2-(3-(3-cyclohexyl-4-oxo-3,4-dihydrophthalazin-1- 
                 277 
               
               
                   
                 yl)phenyl)-2-methylpropanamide 
               
               
                 164 
                 2-(3-(3-cyclohexyl-4-oxo-3,4-dihydrophthalazin-1- 
                 285.5 
               
               
                   
                 yl)phenyl)-N,2-dimethylpropanamide 
               
               
                 165 
                 (R)-4-(3-aminoazepan-1-yl)-2-(2,4- 
                 277.1 
               
               
                   
                 difluorophenyl)phthalazin-1(2H)-one•hydrochloride 
               
               
                 166 
                 2-(3-(3-(2,4-difluorophenyl)-4-oxo-3,4- 
                 239.2 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)-2-methylpropanoic acid 
               
               
                 167 
                 4-(3-aminoazepan-1-yl)-2-(2,4- 
                 249.4 
               
               
                   
                 difluorophenyl)phthalazin-1(2H)-one•hydrochloride 
               
               
                 168 
                 2-(3-(3-(2,4-difluorophenyl)-4-oxo-3,4- 
                 155.7 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)-2-methylpropanenitrile 
               
               
                 169 
                 4-(3-(2-(1H-tetrazol-5-yl)propan-2-yl)phenyl)-2-(2,4- 
                 211.3 
               
               
                   
                 difluorophenyl)phthalazin-1(2H)-one 
               
               
                 170 
                 (E)-2-(3-(3-(2,4-difluorophenyl)-4-oxo-3,4- 
                 262.7 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)-N′-hydroxy-2- 
               
               
                   
                 methylpropanimideamide 
               
               
                 171 
                 2-(3-(3-(2-fluorophenyl)-4-oxo-3,4-dihydrophthalazin-1- 
                 134.7 
               
               
                   
                 yl)phenyl)-2-methylpropanoic acid 
               
               
                 172 
                 4-(3-aminoazepan-1-yl)-2-cyclobutylphthalazin-1(2H)- 
                 99.5 
               
               
                   
                 one•hydrochloride 
               
               
                 173 
                 4-(3-aminoazepan-1-yl)-2-cyclopentylphthalazin-1(2H)- 
                 112.2 
               
               
                   
                 one•hydrochloride 
               
               
                 174 
                 2-(2,4-difluorophenyl)-4-(3-(2-(5-methyl-1,2,4- 
                 114.2 
               
               
                   
                 oxadiazol-3-yl)propan-2-yl)phenyl)phthalazin-1(2H)-one 
               
               
                 175 
                 (R)-4-(3-aminoazepan-1-yl)-2-(2- 
                 155.3 
               
               
                   
                 fluorophenyl)phthalazin-1(2H)-one•hydrochloride 
               
               
                 176 
                 2-(3-(3-(2,4-difluorophenyl)-4-oxo-3,4- 
                 244.30 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)-N-isopropyl-2- 
               
               
                   
                 methylpropanamide 
               
               
                 177 
                 2-(2,4-difluorophenyl)-4-(3-(2-methyl-1-oxo-1- 
                 241.6 
               
               
                   
                 (pyrrolidin1-yl)propan-2-yl)phenyl)phthalazin-1(2H)-one 
               
               
                 178 
                 N-cyclopropyl-2-(3-(3-(2,4-difluorophenyl)-4-oxo-3,4- 
                 331.00 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)-2-methylpropanamide 
               
               
                 179 
                 2-(2,4-difluorophenyl)-4-(3-(2-methyl-1-morpholino-1- 
                 221.60 
               
               
                   
                 oxopropan-2-yl)phenyl)phthalazin-1(2H)-one 
               
               
                 180 
                 N-cyclohexyl-2-(3-(3-(2,4-difluorophenyl)-4-oxo-3,4- 
                 133.30 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)-2-methylpropanamide 
               
               
                 181 
                 2-(3-(3-(2,4-difluorophenyl)-4-oxo-3,4- 
                 122.10 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)-2-methyl-N- 
               
               
                   
                 phenylpropanamide 
               
               
                 182 
                 2-(3-(3-(2,4-difluorophenyl)-4-oxo-3,4- 
                 219.60 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)-2-methyl-N-(1-methyl- 
               
               
                   
                 1H-pyrazol-4-yl)propanamide 
               
               
                 183 
                 1-(3-(3-(2,4-difluorophenyl)-4-oxo-3,4- 
                 194.70 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)cyclopropan-1-carboxylic 
               
               
                   
                 acid 
               
               
                 184 
                 4-(1,4-diazepan-1-yl)-2-(2,4-difluorophenyl)phthalazin- 
                 176.80 
               
               
                   
                 1(2H)-one hydrochloride 
               
               
                 185 
                 (R)-4-(3-aminoazepan-1-yl)-2-(4- 
                 273.80 
               
               
                   
                 chlorophenyl)phthalazin-1(2H)-one hydrochloride 
               
               
                 186 
                 2-(3-(3-(2,4-difluorophenyl)-4-oxo-3,4- 
                 305.80 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)-N-(2-hydroxyethyl)-2- 
               
               
                   
                 methylpropanamide 
               
               
                 187 
                 (R)-N-(1-(3-(2,4-difluorophenyl)-4-oxo-3,4- 
                 303.80 
               
               
                   
                 dihydrophthalazin-1-yl)azepan-3-yl)ethanesulfonamide 
               
               
                 188 
                 2-(3-(3-(2,4-difluorophenyl)-4-oxo-3,4- 
                 358.40 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)-2-methylpropanamide 
               
               
                 189 
                 (R)-2-(2,4-difluorophenyl)-4-(3-(methylamino)azepan-1- 
                 273.70 
               
               
                   
                 yl)phthalazin-1(2H)-one hydrochloride 
               
               
                 190 
                 2-(2,4-difluorophenyl)-4-(3-hydroxyazepan-1- 
                 332.60 
               
               
                   
                 yl)phthalazin-1(2H)-one 
               
               
                 191 
                 (R)-2-(2,4-difluorophenyl)-4-(3-((2- 
                 312.70 
               
               
                   
                 hydroxyethyl)amino)azepan-1-yl)phthalazin-1(2H)-one 
               
               
                   
                 hydrochloride 
               
               
                 192 
                 (R)-N-(1-(3-(2,4-difluorophenyl)-4-oxo-3,4- 
                 286.60 
               
               
                   
                 dihydrophthalazin-1-yl)azepan-3-yl)acetamide 
               
               
                 193 
                 2-(2,4-difluorophenyl)-4-(3-oxoazepan-1-yl)phthalazin- 
                 206.10 
               
               
                   
                 1(2H)-one 
               
               
                 194 
                 2-(3-(3-(4-chlorophenyl)-4-oxo-3,4-dihydrophthalazin- 
                 350.20 
               
               
                   
                 1-yl)phenyl)-2-methylpropanoic acid 
               
               
                 195 
                 1-(3-(3-(4-chlorophenyl)-4-oxo-3,4-dihydrophthalazin- 
                 287.30 
               
               
                   
                 1-yl)phenyl)cyclopropan-1-carboxylic acid 
               
               
                 196 
                 2-(4-chlorophenyl)-4-(3-hydroxyazepan-1- 
                 135.10 
               
               
                   
                 yl)phthalazin-1(2H)-one 
               
               
                 197 
                 2-(3-(3-(4-chlorophenyl)-4-oxo-3,4-dihydrophthalazin- 
                 153.60 
               
               
                   
                 1-yl)phenyl)-2-methylpropanamide 
               
               
                 198 
                 1-(3-(3-(4-chlorophenyl)-4-oxo-3,4-dihydrophthalazin- 
                 225.40 
               
               
                   
                 1-yl)phenyl)cyclopropan-1-carboxyamide 
               
               
                 199 
                 2-(3-(3-(2,4-difluorophenyl)-4-oxo-3,4- 
                 149.41 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)acetic acid 
               
               
                 200 
                 4-(3-(2-aminopropan-2-yl)phenyl)-2-(2,4- 
                 255.33 
               
               
                   
                 difluorophenyl)phthalazin-1(2H)-one hydrochloride 
               
               
                 201 
                 2-(3-(3-(4-chloro-2-fluorophenyl)-4-oxo-3,4- 
                 204.58 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)-2-methylpropanoic acid 
               
               
                 202 
                 (R)-4-(3-aminoazepan-1-yl)-2-(4-chloro-2- 
                 261.73 
               
               
                   
                 fluorophenyl)phthalazin-1-(2H)-one hydrochloride 
               
               
                 203 
                 1-(3-(4-chloro-2-fluorophenyl)-4-oxo-3,4- 
                 109.84 
               
               
                   
                 dihydrophthalazin-1-yl)azepan-3-carbonitrile 
               
               
                 204 
                 4-(3-(1-amino-2-methylpropan-2-yl)phenyl)-2-(2,4- 
                 161.50 
               
               
                   
                 difluorophenyl)phthalazin-1(2H)-one hydrochloride 
               
               
                 205 
                 2-(1-(3-(2,4-difluorophenyl)-4-oxo-3,4- 
                 105.70 
               
               
                   
                 dihydrophthalazin-1-yl)piperidin-3-yl)-2- 
               
               
                   
                 methylpropanoic acid 
               
               
                 206 
                 2-(3-(3-(4-cyclopropylphenyl)-4-oxo-3,4- 
                 182.70 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)-2-methylpropanoic acid 
               
               
                 207 
                 1-(3-(3-(2,4-difluorophenyl)-4-oxo-3,4- 
                 309.90 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)cyclobutane-1-carboxylic 
               
               
                   
                 acid 
               
               
                 208 
                 1-(3-(3-(2,4-difluorophenyl)-4-oxo-3,4- 
                 117.30 
               
               
                   
                 dihydrophthalazin-1-yl)phenyl)cyclopentane-1- 
               
               
                   
                 carboxylic acid 
               
               
                 209 
                 2-(1-(3-(4-chlorophenyl)-4-oxo-3,4-dihydrophthalazin- 
                 169.10 
               
               
                   
                 1-yl)piperidin-3-yl)-2-methylpropanoic acid 
               
               
                 210-1 
                 2-(1-(3-(2,4-difluorophenyl)-4-oxo-3,4- 
                 199.00 
               
               
                   
                 dihydrophthalazin-1-yl)piperidin-3-yl)-2- 
               
               
                   
                 methylpropanoic acid 
               
               
                 210-2 
                 2-(1-(3-(2,4-difluorophenyl)-4-oxo-3,4- 
                 100.50 
               
               
                   
                 dihydrophthalazin-1-yl)piperidin-3-yl)-2- 
               
               
                   
                 methylpropanoic acid 
               
               
                 211 
                 methyl 1-(1-(3-(2,4-difluorophenyl)-4-oxo-3,4- 
                 170.00 
               
               
                   
                 dihydrophthalazin-1-yl)piperidin-3-yl)cyclopropan-1- 
               
               
                   
                 carboxylate 
               
               
                 212 
                 1-(1-(3-(2,4-difluorophenyl)-4-oxo-3,4- 
                 170.10 
               
               
                   
                 dihydrophthalazin-1-yl)piperidin-3-yl)cyclopropan-1- 
               
               
                   
                 carboxylic acid 
               
               
                 213-1 
                 1-(1-(3-(2,4-difluorophenyl)-4-oxo-3,4- 
                 168.10 
               
               
                   
                 dihydrophthalazin-1-yl)piperidin-3-yl)cyclopropan-1- 
               
               
                   
                 carboxylic acid 
               
               
                 213-2 
                 1-(1-(3-(2,4-difluorophenyl)-4-oxo-3,4- 
                 102.60 
               
               
                   
                 dihydrophthalazin-1-yl)piperidin-3-yl)cyclopropan-1- 
               
               
                   
                 carboxylic acid 
               
               
                 214 
                 2-(2,4-difluorophenyl)-4-(3-(pyrrolidin1- 
                 233.90 
               
               
                   
                 ylsulfonyl)phenyl)phthalazin-1(2H)-one 
               
               
                 215 
                 2-(2,4-difluorophenyl)-4-(1,2,3,6-tetrahydropyridin-4- 
                 226.60 
               
               
                   
                 yl)phthalazin-1(2H)-one hydrochloride 
               
               
                 216 
                 3-(3-(2,4-difluorophenyl)-4-oxo-3,4-dihydrophthalazin- 
                 184.80 
               
               
                   
                 1-yl)-N-ethyl-N-methylbenzenesulfonamide 
               
               
                 217 
                 3-(3-(2,4-difluorophenyl)-4-oxo-3,4-dihydrophthalazin- 
                 185.10 
               
               
                   
                 1-yl)-N,N-diethylbenzenesulfonamide 
               
               
                 218 
                 2-(2,4-difluorophenyl)-4-(1-(ethylsulfonyl)-1,2,3,6- 
                 176.50 
               
               
                   
                 tetrahydropyridin-4-yl)phthalazin-1(2H)-one 
               
               
                 219 
                 2-(4-(3-(2,4-difluorophenyl)-4-oxo-3,4- 
                 114.60 
               
               
                   
                 dihydrophthalazin-1-yl)piperazin-2-yl)-2- 
               
               
                   
                 methylpropanoic acid 
               
               
                 220 
                 2-(4-(3-(2,4-difluorophenyl)-4-oxo-3,4- 
                 125.80 
               
               
                   
                 dihydrophthalazin-1-yl)-1-methylpiperazin-2-yl)-2- 
               
               
                   
                 methylpropanoic acid 
               
               
                 221 
                 2-(4-(3-(2,4-difluorophenyl)-4-oxo-3,4- 
                 125.50 
               
               
                   
                 dihydrophthalazin-1-yl)morpholin-2-yl)-2- 
               
               
                   
                 methylpropanoic acid