# Patent

## Title
Anti-HIV compound and preparation method and use thereof

## Abstract

The present invention relates to the technical field of chemically synthesized drugs, in particular to an anti-HIV drug or prodrug and preparation method and uses thereof. The compound or prodrug compound of the present invention has a structural formula as represented by formula I. The compounds have anti-HIV-1 and anti-HIV-2 virus activity, and have a C8166 therapeutic index as high as 2081.59 and an H9 therapeutic index as high as 303.03. Furthermore, the compounds have high solubility up to 1290-2845.5 μg/ml in an aqueous solution, and can be formulated into an oral formulation.

## Background
FIELD OF THE INVENTION
The present invention relates to the technical field of chemically synthesized drugs, in particular to an anti-HIV drug or prodrug and preparation method and uses thereof.
BACKGROUND OF THE INVENTION
Acquired immune deficiency syndrome (AIDS), which disseminates quickly in the world, has become significant public health event and social hot spot.
AIDS was identified as a disease in 1981 by Centers for Disease Control and Prevention of USA. China experienced its first case of AIDS in 1985. In the past two decades, more and more cases were reported. Nowadays, it has already been spread in many areas of the world. Since China is a country of vast territory and large population, together with the recently frequent international contacts, the number of HIV infections increased year by year. AIDS is a spectrum of conditions caused by the human immunodeficiency virus (HIV), with poor prognosis and high mortality rate. According to the related report of UNAIDS, the population of HIV infections around the world is more than 39 million. Nowadays, India takes over South Africa as the largest population of HIV-infected individuals in the world.
Thus, finding a way to stop the spread of AIDS has become the focus of the world. Most of the Anti-AIDS drugs in clinic are HIV-1 reverse transcriptase inhibitors and HIV-1 protease inhibitors at present time. In humans, the apolipoprotein B mRNA-editing enzyme catalytic polypeptidelike 3G (APOBEC3G, A3G) is a major host-cell factor which can severely weaken the infectivity of HIV-1. It was proved that HIV-1 viral infectivity factor (Vif) can protect the virus from A3G-mediated viral cDNA hypermutation. Therefore, to protect A3 G from degradation, it is very crucial to design inhibitors targeting Vif. In addition, development of multi-target inhibitor of Vif accompanied by other enzymes may improve the therapeutic effect and reduce the virus resistance.
The inventor of this invention endeavored to find the new HIV inhibitors. The inventor has synthesized a series of N-phenyl-2-thiophenylbenzamide derivatives and N-phenyl-2-thiol benzamide derivatives as following:




However, those compounds show general activity, high cytotoxicity, poor solubility and low bioavailability which restrict its application.
In the follow-up project, the inventor found that R1 or R2 substituted by —NH2 or —NH2—R can obviously improve the anti-HIV activity, solubility, druggability and reduce drug toxicity.
SUMMARY OF THE INVENTION
One embodiment of the present invention is directed to a new HIV inhibitor of formula (I) or its pharmaceutically acceptable salt.
In one embodiment, the HIV inhibitors of the present invention have the following structural formula (I):




wherein:

X is selected from the group consisting of: S, SO, SO2, NR7, CH2 or O;
Y is selected from the group consisting of: CONR7, NR7CO, SO2NR7 or NR7SO2;
R1, R2, R3 and R4 are independently selected from the group consisting of: H, NO2,




NR15R16 or CF3, and R1, R2, R3 and R4 cannot be H in same time;

R5 is selected from the group consisting of: H, C1-8 alkoxy, C1-8 alkanoyl, C1-8 alkylamino, C1-8 alkyl, OH, NO2, halogen, COOH,




or NH2;

R6 is selected from the group consisting of: H, NO2, C1-8 alkoxy, C1-8 alkanoyl, C1-8 alkylamino, C1-8 alkyl, OH, COOH, halogen or NH2;
R7 is selected from the group consisting of: H or C1-8 alkyl;
R15 and R16 are independently selected from the group consisting of: H, CH3, C1-8 alkanoyl,




C1-8 alkyl, -A-NH2, -A-OH, -A-halogen or





A is C1-8 alkyl; n=0, 1 or 2;

R20 is selected from the group consisting of: aryl, substituted aryl, heteroaryl, substituted heteroaryl, which can hydrolyze inside of body.
R22 is selected from the group consisting of: H, C1-8 alkyl, aryl or substituted aryl;
R23, R24 and R25 are independently selected from the group consisting of: H, C1-8 alkyl, C1-8 alkanoyl or substituted C1-8 alkanoyl;
The term “substituted” as used herein refers to NO2, NH2, OH, CF3, halogen, carboxyl, C1-8 alkoxy, C1-8 alkanoyl, C1-8 alkylamino, C1-8 alkyl;
The term “alkanoyl” as used herein refers to a straight, branched or cyclic alkanoyl group attached to acyl (alkyl-CO—). “C1-8 alkanoyl” refers to an alkanoyl group which has 1-8 carbon atom(s). Exemplary alkanoyl groups include, but are not limited to acetyl, propanoyl, isopropanoyl, butanoyl, etc.
The term “alkoxy” as used herein refers to a straight or branched alkyl group attached to oxygen (alkyl-O—). “C1-8 alkoxy” refers to an alkoxy group which has 1-8 carbon atom(s). Exemplary alkoxy groups include, but are not limited to methoxy, ethoxy, isopropoxy, etc.
The term “alkylamino” as used herein refers to a straight or branched alkyl group attached to amidogen (alkyl-NH2—). “C1-8 alkylamino” refers to an alkylamino group which has 1-8 carbon atom(s).Exemplary alkylamino groups include, but are not limited to methylamino, ethylamino, 1-propanamine,isopropylamine, n-butylamine, etc.
The term “alkyl” as used herein refers to a straight, branched or cyclic. “C1-8 alkyl” refers to an alkyl group which has 1-8 carbon atom(s). Exemplary “alkyl” groups include, but are not limited to methyl, ethyl, 1-propyl, 2-propyl, 2-methyl-1-propyl, 2-methyl-2-propyl, 1-butyl, 2-butyl, 1-pentyl, 2-pentyl, 3-pentyl, 2-methyl-1-butyl, 3-methyl-1-butyl, 3-methyl-2-butyl, 2,2-dimethyl-1-propyl, 1-hexyl, 1-heptyl, n-heptyl, etc.
In another embodiment of the invention, HIV inhibitor compounds have the following structural formula (II):




According to knowledge of bioisostere and molecular similarity, Y=CONR7, Y═NR7CO, Y=SO2NR7 and Y=NR7SO2 show the similar structure and activity.
In further optimize embodiment of the invention, HIV inhibitor compounds have the following structural formula (III):




In another embodiment of the invention, HIV inhibitor compounds have the following structural formula (III-1), characterized in that R1=NR15R16, R2—R4=H;




Wherein:

R5 is selected from the group consisting of: C1-8 alkoxy, halogen, carboxyl,




C1-8 alkyl or NH2;

R6 is selected from the group consisting of: NO2, NH2, C1-8 alkyl or carboxyl;
X is selected from the group consisting of: S, SO, SO2 or O, and particularly X=S or SO2.
In another embodiment of the invention, HIV inhibitor compounds have the following structural formula (III-11), characterized in that R15=H, R16=H,




C1-8 alkyl, -A-NH2, -A-OH, -A-halogen or





In another embodiment of the invention, HIV inhibitor compounds have the following structural formula (III-11), characterized in that




R20=aryl, substituted aryl, heteroaryl, substituted heteroaryl, which can has hydrolyzed inside of body.

Another embodiment of the present invention relates to the compound of formula (III-11), characterized in that R20 is single amino acid or peptide;
the amino acid residue directly connected to the carbonyl group is lack of α-C carboxyl like




etc.

wherein the “amino acid” can be Ala, Arg, Asn, Asp, Cys, Glu, Gln, Gly, His, Ile, Leu, Lys, Met, Phe, Pro, Ser, Thr, Trp, Tyr, Val; and particularly Phe, Gly, Lys. (compound 66, 67, 68, 83)
The ideal way of administration for AIDS drugs is oral. Generally, oral bioavailability has close relationship with the solubility. In this invention, although the derivative 46 with R1=NH2 shows the strongest antiviral activity, it bears the general solubility. In order to improve the oral bioavailability, the inventor used those amino acids to react with the amine group and acquired the corresponding prodrugs. Those prodrugs can be hydrolyzed to form the active compounds in the body. For example, compound 67 can be hydrolyzed to generate the active compound 46.




Another embodiment of the present invention relates to the compound of formula (III-11), characterized in that R20 is aryl, substituted aryl, heteroaryl or substituted heteroaryl and particularly R20 is aryl or substituted aryl; X=S, SO, SO2 or O, and particularly X=S or SO2.
The term “substituted” as used herein refers to NO2, NH2, OH, CF3, halogen, carboxyl, C1-8 alkoxy, C1-8 alkanoyl, C1-8 alkylamino, C1-8 alkyl;
The term “alkanoyl” as used herein refers to a straight, branched or cyclic alkanoyl group attached to acyl (alkyl-CO—).
The term “alkoxy” as used herein refers to a straight or branched alkyl group attached to oxygen (alkyl-O—).
The term “alkylamino” as used herein refers to a straight or branched alkyl group attached to amidogen (alkyl-NH2—).
The term “alkyl” as used herein refers to a straight, branched or cyclic.
Another embodiment of the present invention relates to the compound of formula (III-11), characterized in that R16=H, structural format is as follows:




Another embodiment of the present invention relates to the compound of formula (III-11-1), characterized in that R6 is 4-substituted NO2 or COOH, structural format is as follows:




Another embodiment of the present invention relates to the compound of formula (III-11-11), R5 is 2-substituted, structural format is as follows:




Wherein:
R5 is H, C1-8 alkoxy, halogen, carboxyl,




C1-8 alkyl or NH2;

The term “alkoxy” as used herein refers to a straight or branched alkyl group attached to oxygen (alkyl-O—).
The term “alkyl” as used herein refers to a straight, branched or cyclic;
X is S, SO, SO2 or O, and particularly X=S or SO2.
Another embodiment of the present invention relates to the compound of formula (III-11-111), characterized in that R6=NO2, structural format is as follows:




Wherein:

when R5 is C1-8 alkoxy, the term “alkoxy” as used herein refers to a straight or branched alkyl group attached to oxygen (alkyl-O—), and particularly R5=methoxyl; X=S, SO2 or O; (compound 25, 46, 48)
when R5 is halogen, the term “halogen” as used herein refers to F, Cl, Br or I, and particularly R5=I; X=S or SO2; (compound 71, 72)
when R5 is carboxyl, X=S or SO2;
when R5 is




R22 is H or C1-8 alkyl particularly R22=methyl; X=S or SO2; (compound 73)

when R5 is C1-8 alkyl particularly R5=methyl; X=S or SO2;
when R5=NH2; X=S or SO2.
Another embodiment of the present invention relates to the compound of formula (III-11-11), characterized in that R6=COOH, structural format is as follows:




Wherein R5 is C1-8 alkoxy particularly R5=methoxyl; X=S or SO2. (compound 76, 77)
Another embodiment of the present invention relates to the compound of formula (III-11-11), characterized in that R6=NO2, R5 is 2-substituted or 4-substituted, structural format is as follows:




Wherein:

R5 is C1-8 alkoxy particularly R5=methoxyl;
R5′ is C1-8 alkoxy or NH2 particularly R5=methoxyl;
X=S or SO2. (compound 50, 51)
Another embodiment of the present invention relates to the compound of formula (III-11-11), characterized in that R5 is 3-substituted, structural format is as follows:




Wherein:

R6 is NO2;
R5 is C1-8 alkoxy particularly R5=methoxyl; X=S, SO2 or O;
when R5 is halogen, the term “halogen” as used herein refers to F, Cl, Br or I, and particularly R5=I; X=S or SO2;
when R5 is carboxyl, X=S or SO2;
when R5 is




R22 is H or C1-8 alkyl particularly R22=methyl; X=S or SO2;

when R5 is C1-8 alkyl particularly R5=methyl; X=S or SO2;
when R5=NH2; X=S or SO2. (compound 49)
Another embodiment of the present invention relates to the compound of formula (III-11-1), characterized in that R6 is 3-substituted and 5-substituted, structural format is as follows:




Wherein:

R6 and R6′ are independently selected from the group consisting of: C1-8 alkyl and particularly R6 and R6′=methyl;
R5 is C1-8 alkoxy particularly R5=methoxyl; X=S or SO2; (compound 75)
Another embodiment of the present invention relates to the compound of formula (III-11); characterized in that R16 is




R24 and R25 are independently selected from the group consisting of: H or C1-8 alkyl, and particularly R24 and R25 are independently as





X=S or SO2. (Compound 65)

Another embodiment of the present invention relates to the compound of formula (III-11); characterized in that R16 is




R22 is H, C1-8 alkyl, aryl or substituted aryl; The term “substituted” as used herein refers to NO2, NH2, OH, CF3, halogen, carboxyl, C1-8 alkyl; particularly R22=methyl; X is S, SO, SO2 or O, and particularly X=S or SO2. (Compound 56, 57, 60, 61)

Another embodiment of the present invention relates to the compound of formula (III-11);characterized in that R16 is C1-8 alkyl, particularly R16=methyl; X is S, SO, SO2 or O, and particularly X=S or SO2. (Compound 59)
Another embodiment of the present invention relates to the compound of formula (III-11);characterized in that R16=—C1-8 alkyl-NH2, particularly R16=—(CH2)2—NH2; X is S, SO, SO2 or O, and particularly X=S or SO2. (compound 78, 79)
Another embodiment of the present invention relates to the compound of formula (III-11);characterized in that R16=—C1-8 alkyl-OH, particularly R16=—(CH2)2—OH; X is S, SO, SO2 or O, and particularly X=S or SO2. (compound 80, 81)
Another embodiment of the present invention relates to the compound of formula (III-11);characterized in that R16=—C1-8 alkyl-halogen, particularly R16=—(CH2)2—Br; X is S, SO, SO2 or O, and particularly X=S or SO2. (compound 64)
Another embodiment of the present invention relates to the compound of formula (III-11); characterized in that R16 is




particularly n=1. (compound 82)

Another embodiment of the present invention relates to the compound of formula (III-11);characterized in that R15 and R16 are independently selected from the group consisting of: C1-8 alkyl, and particularly R15═R16=methyl; X is S, SO, SO2 or O, and particularly X=S or SO2. (compound 58)
Another embodiment of the present invention relates to the compound of formula (III), characterized in that X=S, structural format is as follows:




Wherein:

R1 is H, NO2, NR15R16 or CF3; R15 and R16 are independently selected from the group consisting of: H, CH3 or ethanoyl;
R2 is H, NO2, NR15R16 or CF3; R15 and R16 are independently selected from the group consisting of: H, CH3 or ethanoyl; R1 and R2 cannot be H at same time;
R5 is H, NH2, C1-8 alkyl or C1-8 alkoxy;
R6 is H, NO2, NH2 or C1-8 alkoxy.
Another embodiment of the present invention relates to the compound of formula (III), characterized in that R1=H, structural format is as follows:




Wherein:

R2 is H, NO2, NR15R16 or CF3; R15 and R16 are independently selected from the group consisting of: H, CH3 or ethanoyl;
R5 is H, NH2, C1-8 alkyl or C1-8 alkoxy;
R6 is H, NO2, NH2 or C1-8 alkoxy.
Another embodiment of the present invention relates to the compound of formula (III-21), structural format is as follows:




Another embodiment of the present invention relates to the compound of formula (III-21-1), characterized in that R2 is NR15R16; R15 and R16 are independently selected from the group consisting of: H, CH3 or ethanoyl; and particularly R2=NH2, R5=methoxyl, R6=NO2. (compound 24, 27, 28, 29)
Another embodiment of the present invention relates to the compound of formula (III-2), characterized in that R1=NO2, R2=H, structural format is as follows:




Wherein:

R5 is H, NH2 or C1-8 alkoxy;
R6 is H, NO2, NH2 or C1-8 alkoxy.
Another embodiment of the present invention relates to the compound of formula (III-2), characterized in that R5 is 2-substituted or 4-substituted NH2 or C1-8 alkoxy, R6 is 4-substituted NO2, structural format is as follows:




Another embodiment of the present invention relates to the compound of formula (III-2-1), characterized in that R5 is 2-substituted, structural format is as follows:




wherein R5 is C1-8 alkoxy; and particularly R5=methoxyl (compound 52) or R5=NH2. (compound 53)
Another embodiment of the present invention relates to the compound of formula (III-2), characterized in that R6=NO2, R5=COOH. (compound 54) structural format is as follows:




Another embodiment of the present invention relates to the compound of formula (III-2), characterized in that R6=NO2, R5=NH2. (compound 55) structural format is as follows:




Another embodiment of the present invention relates to the compound of formula (III), characterized in that R1=NH2, R2-R4=H; R5 is H, C1-8 alkoxy, C1-8 alkyl or NH2; R6 is H, NO2, NH2 or C1-8 alkoxy.
Another embodiment of the present invention relates to the compound of formula (III); characterized when X=S; R1 is H,




R5=methoxyl; (compound 62, 63)

when X is O═S═O; R6=4-NO2; R5=methoxyl.
Examples of formula compounds are shown below.




























The present invention also provides for processes of making the pharmaceutically acceptable salts. The term “salts” as used herein refers to hydrochloride, sulfate, phosphate or nitrate and particularly hydrochloride.
The present invention also provides for compound's application as anti-HIV drug, antitumor drug or anti-HBV drug.
Moreover, the present invention also provides for compound's application as HIV-1 or HIV-2 inhibitor.
Formula I compounds of the present invention are prepared using the method described below:




Wherein X=S, SO, SO2 or O;
Y=CONR7, NR7CO, SO2NR7 or NR7SO2;
Z=COOH, COCl,




or NR7H;

U=COOH, COCl,




or NR7H;

When Z=COOH, COCl,




U=NR7H; when U=COOH, COCl,





Z=NR7H;

V=Cl, Br or I; W=SH or OH.
When X=S, the synthesis route are described below:




Wherein Y=CONR7, NR7CO, SO2NR7 or NR7SO2.
The beneficial effect of the invention:
The compounds have anti-HIV-1 and anti-HIV-2 virus activity, and have a C8166 therapeutic index as high as 2081.59 and an H9 therapeutic index as high as 303.03. Furthermore, the compounds have high solubility (1290-2845.5 μg/ml in an aqueous solution), and can be formulated into an oral formulation.



BRIEF DESCRIPTION OF THE DRAWINGS
The following detailed description, given by way of example, but not intended to limit the invention solely to the specific embodiments described, may best be understood in conjunction with the accompanying drawings, in which:
FIG. 1 shows a plasma concentration image of compound 67 at 100 mg/Kg by gavage.
FIG. 2 shows a plasma concentration image of compound 67 at 50 mg/Kg by intravenous.
FIG. 3 shows a degradation image of compound 67 in weak acid solution.
FIG. 4 shows a degradation image of compound 67 under mild alkaline conditions.
FIG. 5 shows a possible binding mode between Vif and compound 46.



EXPERIMENTAL EXAMPLES
Example 1
General Procedure for 2-amino-N-(2-methoxyphenyl)-6-(4-nitrophenylthi-o)benzamide (Compound 25)




Synthesis of 2-amino-6-bromo-N-(2-methoxyphenyl)benzamide




A mixture of 2-methoxyaniline (1.0 equiv.), 2-amino-6-bromobenzoic acid (1.0 equiv.), EDCI (1.2 equiv.) in THF (10 ml) was stirred at room temperature for 5 hrs. After the reaction was completed, the THF was removed by vacuum distillation. The resulting reaction mixture was extracted with EtOAc (3×20 mL). The combined organic extracts were washed with water (20 mL), brine (20 mL), dried over MgSO4 and concentrated in vacuo. The residue was purified over silica gel using EtOAc:Hexanes (1:4) as the eluent to afford intermediate 25 (yield 85%) as a brown crystalline solid.
1H NMR (400 MHz, DMSO) δ=3.80 (s, 3H), 5.33 (s, 2H), 6.72 (d, J=8 Hz, 1H), 6.78 (d, J=8 Hz, 1H), 6.99 (m, 2H), 6.07 (d, J=8.4 Hz, 1H), 7.18 (t, J=7.6 Hz, 1H), 7.85 (t, J=7.2 Hz, 1H), 9.43 (s, 1H).
ESI-MS: [M+Na]+ m/z 346.
Synthesis of 2-amino-N-(2-methoxyphenyl)-6-(4-nitrophenylthi-o)benzamide




A mixture of 2-amino-6-bromo-N-(2-methoxyphenyl)benzamide (1.0 equiv.), 4-nitrobenzenethiol (2.0 equiv.), nanometer copper powder (0.5 equiv.) and anhydrous potassium carbonate (3.0 equiv.) were mixed in DMF (40 mL) at RT. Then the reaction flask was heated in an oil bath at 65° C. After 8 h, the heating bath was removed and the reaction flask was allowed to cool to room temperature. The reaction mixture was filtered and the liquid layer was diluted with water (40 mL), extracted with ethyl acetate (3×20 mL), washed with water (6×15 mL), dried over anhydrous Na2SO4, filtered, and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (1:3 v/v ethyl acetate/petroleum ether) to provide the product compound 6 as a yellow amorphous solid (yield 75%).
1H NMR (400 MHz, CDCl3) δ=3.69 (s, 3H), 4.54 (br, 2H), 6.84 (d, J=8 Hz, 2H), 6.95 (m, 2H), 7.06 (t, J=8 Hz, 1H), 7.22 (m, 3H), 8.03 (d, J=7.6 Hz, 2H), 8.23 (s, 1H), 8.32 (d, J=7.6 Hz, 1H).
ESI-MS: [M+H]+ m/z 396.
Example 2
General Procedure for N-(2-methoxyphenyl)-2-((4-nitrophenyl)thio)-5-(trifluoromethyl)benzamide (Compound 22)




Prepared by proceeding in similar manner to example 1, staring from N-(2-methoxyphenyl)-2-((4-nitrophenyl)thio)-5-(trifluoromethyl)benzamide. Yellow solid; 77.9% yield;
1H NMR (400 MHz, CDCl3) δ=3.85 (s, 3H), 6.90 (d, J=8.1 Hz, 1H), 6.99 (t, J=7.6 Hz, 1H), 7.11 (td, J=8.0, 1.5, 1H), 7.44 (d, J=8.8, 2H), 7.52 (d, J=8.3 Hz, 1H), 7.67 (dd, J=8.3, 1.5, 1H), 7.97 (s, 1H), 8.14 (t, J=5.7, 2H), 8.39 (d, J=6.2, 2H).
ESI-MS: [M+H]+ m/z 449.
Example 3
General Procedure for N-(2-methoxyphenyl)-5-nitro-2-(4-nitrophenylthio)benzamide (Compound 23)




Prepared by proceeding in similar manner to example 1, staring from 2-bromo-5-nitrobenzoic acid. Yellow solid; 82.5% yield;
1H NMR (400 MHz, CDCl3) δ=3.80 (s, 3H), 6.88 (d, J=8 Hz, 1H), 6.92 (t, J=8 Hz, 1H), 7.03 (t, J=7.2 Hz, 1H), 7.16 (m, 2H), 7.34 (d, J=7.2 Hz, 1H), 7.68 (d, J=8 Hz, 1H), 7.89 (d, J=7.2 Hz, 1H), 8.12 (d, J=8 Hz, 2H), 8.43 (s, 1H), 8.57 (s, 1H) ppm.
ESI-MS: [M+Na]+ m/z 448.
Example 4
General Procedure for 2-amino-N-(2-methoxyphenyl)-6-(4-nitrophenyl-thio)benzamide hydrochloride




2-amino-N-(2-methoxyphenyl)-6-(4-nitrophenyl-thio)benzamide dissolved in EA, stirred at room temperature, while HCl is inlet till occurred to white solid. The reaction mixture was filtered to get White solid; 94.2% yield;
1H NMR (400 MHz, DMSO) δ=3.69 (s, 3H), 5.33 (br, 3H), 6.81 (d, J=7.6 Hz, 1H), 6.92 (m, 2H), 7.01 (d, J=8 Hz, 1H), 7.12 (t, J=7.6 Hz, 1H), 7.25 (t, J=8 Hz, 1H), 7.31 (d, J=8.8 Hz, 2H), 7.758 (d, J=8 Hz, 1H), 8.098 (d, J=8.4 Hz, 2H), 9.397 (br, 1H) ppm.
ESI-MS: [M+Na]+ m/z 403.
Example 5
General Procedure for 2-amino-N-(2-methoxyphenyl)-6-(4-nitrophenyl-thio)benzamide sulfate




2-amino-N-(2-methoxyphenyl)-6-(4-nitrophenyl-thio)benzamide dissolved in EA, stirred at room temperature, while dropped H2SO4 into mixture till occurred to white solid. The reaction mixture was filtered to get White solid; 72% yield;
1H NMR (400 MHz, DMSO) δ=3.69 (s, 3H), 4.02 (br, 3H), 6.78 (d, J=8.4 Hz, 1H), 6.90 (m, 2H), 7.01 (d, J=7.6 Hz, 1H), 7.10 (t, J=7.6 Hz, 1H), 7.236 (t, J=8 Hz, 1H), 7.305 (d, J=8.8 Hz, 2H), 7.753 (d, J=7.6 Hz, 1H), 8.097 (d, J=8.8 Hz, 2H), 9.379 (br, 1H) ppm.
ESI-MS: [M+Na]+ m/z 448.
Example 6
General Procedure for 2-amino-N-(2-methoxyphenyl)-6-((4-nitrophen-yl)sulfinyl)benzamide




Compound 25 (1.0 equiv.) was dissolved in CH3OH (30 mL) with a magnetic stirrer at RT, and 35% H2O2 (3.0 equiv.) was added slowly to this solution. This reaction mixture was heated in an oil bath at 66° C. and monitored using TLC. The reaction was quenched with MnO2 at RT. The mixture was filtered and the residue was washed with ethyl acetate (3×5 mL). The liquid layer was concentrated under reduced pressure and the oily residue was purified by silica gel column chromatography (1:4 v/v ethyl acetate/petroleum ether) to provide a yellow solid; 44.3% yield;
1H NMR (400 MHz, CDCl3) δ=3.90 (s, 3H), 4.46 (brs, 2H), 6.88 (d, J=8.0 Hz, 1H), 6.96 (d, J=8.0 Hz, 1H), 7.04 (t, J=7.6 Hz, 1H), 7.17 (t, J=8.0 Hz, 1H), 7.41 (t, J=8.0 Hz, 1H), 7.47 (d, J=7.2 Hz, 1H), 7.91 (d, J=8.8 Hz, 2H), 8.21 (d, J=8.8 Hz, 2H), 8.28 (d, J=7.2 Hz, 1H), 8.75 (brs, 1H).
ESI-MS: [M+Na]+ m/z 434.
Example 7
General Procedure for 2-amino-N-(2-methoxyphenyl)-6-((4-nitroph-enyl)sulfonyl)benzamide (Compound 46)




Compound 25 (1.0 equiv.) was dissolved in acetic acid (30 mL) with a magnetic stirrer at RT, and H2O2 (3.0 equiv.) was added to this solution. This reaction mixture was heated in an oil bath at 65° C. and the reaction was monitored using TLC. The reaction was quenched with MnO2 (3.5 equiv.) at RT. The mixture was filtered and the residue was washed with ethyl acetate (3×10 mL). The liquid layer was concentrated under reduced pressure and the oily residue was purified by silica gel column chromatography (1:2 v/v ethyl acetate/petroleum ether) to provide the product as a yellow amorphous solid (162.4 mg, 38% yield).
1H NMR (400 MHz, DMSO) δ=3.79 (s, 3H), 5.57 (s, 2H), 7.01 (t, J=7.6 Hz, 1H), 7.08 (m, 2H), 7.22 (t, J=7.6 Hz, 1H), 7.29 (d, J=7.6 Hz, 1H), 7.36 (t, J=7.6 Hz, 1H), 7.76 (d, J=7.6 Hz, 1H), 8.16 (d, J=8.8 Hz, 2H), 8.36 (d, J=8.8 Hz, 2H), 9.71 (s, 1H).
ESI-MS: [M+H]+ m/z 428.
Example 8
General Procedure for 5-amino-N-(2-methoxyphenyl)-2-((4-nitrophenyl)thio)benzamide (Compound 24)




Intermediate 8a
Synthesis of 2-bromo-5-(tert-butoxycarbonylamino)benzoic acid
A mixture of 2-bromo-5-aminobenzoate (1.0 equiv.), BOC anhydride (1 equiv.) was dissolved in 15 mL THF, and stirring at room temperature, and DMAP (0.5 equiv.) was added to this solution, then dropped triethylamine (2.0 equiv.) to the mixture. The reaction stirring continued for 5 hours at room temperature. After the reaction was complete, the reaction solution was concentrated under reduced pressure, concentrate was dissolved in ethyl acetate, the organic layer was washed once with saturated brine, dried over anhydrous Na2SO4, purified by column chromatography (petroleum ether:ethyl acetate) to give a yellow solid 8a, in 95% yield.
Intermediate 8b
Synthesis of 5-(tert-butoxycarbonylamino)-2-(4-nitrophenyl-thio)benzoic acid
A mixture of intermediate 8a (1.0 equiv.), 4-nitrobenzenethiol (2.0 equiv.), nanometer copper powder (0.5 equiv.) and anhydrous potassium carbonate (3.0 equiv.) were mixed in DMF (40 mL) at RT. Then the reaction flask was heated in an oil bath at 55° C. After 8 h, the heating bath was removed and the reaction flask was allowed to cool to room temperature. The reaction mixture was filtered and the liquid layer was diluted with water (40 mL), extracted with ethyl acetate (3×20 mL), washed with water (6×15 mL), dried over anhydrous Na2SO4, filtered, and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (1:3 v/v ethyl acetate/petroleum ether) to provide the product intermediate 8b as a yellow amorphous solid; 77% yield.
Intermediate 8c
Synthesis of tert-butyl 3-(2-methoxyphenylcarbamoyl)-4-(4-nitrophenylthio)phenylcarbamate
A mixture of 2-methoxyaniline(1.0 equiv.), intermediate 8b (1.0 equiv.), EDCI (1.2 equiv.) in DCM (10 ml) was stirred at room temperature for 5 hrs. After the reaction was completed, the DCM was removed by vacuum distillation. The resulting reaction mixture was extracted with EtOAc (3×20 mL). The combined organic extracts were washed with water (20 mL), brine (20 mL), dried over MgSO4 and concentrated in vacuo. The residue was purified over silica gel using EtOAc:Hexanes (1:4) as the eluent to afford intermediate 8c (yield 79%) as a white solid.
Synthesis of 5-amino-N-(2-methoxyphenyl)-2-(4-nitrophenylthio)benzamide
The 8c (1.0 equiv.) was dissolved in DCM, stirring at room temperature, dropwise trifluoroacetic acid (TFA 5 mmol) into the mixture, then stirred for 2 hours at room temperature. After completion of the reaction, the reaction solution was concentrated under reduced pressure, concentrate was dissolved in ethyl acetate, the organic layer was washed once with saturated brine, dried over anhydrous sodium sulfate and then was added, and finally the organic layer was concentrated under reduced pressure, purified by column chromatography (petroleum ether:ethyl acetate) to give a yellow solid, yield 84%.
1H NMR (400 MHz, CDCl3) δ=3.71 (s, 3H), 4.20 (brs, 2H), 6.82 (m, 2H), 6.95 (t, J=7.6 Hz, 1H), 7.04 (t, J=8.0 Hz, 1H), 7.14 (m, 3H), 7.42 (d, J=8.0 Hz, 1H), 8.03 (d, J=9.2 Hz, 2H), 8.40 (d, J=8.0 Hz, 1H), 8.45 (brs, 1H).
ESI-MS: [M+H]+ m/z 396.
Example 9
General Procedure for N-(2-methoxyphenyl)-5-(methylamino)-2-((4-nitrophenyl)thio)benzamide (Compound 27)




Compound 24 (1.0 equiv.) was dissolved in DMF (40 mL) and treated with anhydrous potassium carbonate (2.0 equiv.) at room temperature. To this mixture was added iodomethane (0.9 equiv.) via a micro syringe. After being stirred for 10 h at 50° C., the reaction mixture was poured into ice-cold water (200 mL) to get crude product. The crude solid was filtered and washed several times with water and purified by silica gel column chromatography (1:6 v/v ethyl acetate/petroleum ether) to provide a yellow solid (43% yield).
1H NMR (400 MHz, CDCl3) δ=2.93 (s, 3H), 3.69 (s, 3H), 4.24 (brs, 1H), 7.72 (d, J=8.4 Hz, 1H), 6.82 (d, J=8.0 Hz, 1H), 6.94 (t, J=6.4 Hz, 1H), 7.03 (m, 2H), 7.13 (d, J=8.8 Hz, 2H), 7.43 (d, J=8.4 Hz, 1H), 8.02 (d, J=8.8 Hz, 2H), 8.41 (d, J=8.0 Hz, 1H), 8.45 (brs, 1H).
ESI-MS: [M+H]+ m/z 410.
Example 10
General Procedure for 5-(dimethylamino)-N-(2-methoxyphenyl)-2-((4-nitrophenyl)thio)benzamide (Compound 28)




Compound 24 (1.0 equiv.) was dissolved in DMF (40 mL) and treated with anhydrous potassium carbonate (4.0 equiv.) at room temperature. To this mixture was added iodomethane (2.5 equiv.) via a micro syringe. After being stirred for 10 Hours at 60° C., the reaction mixture was poured into ice-cold water (200 mL) to get crude product. The crude solid was filtered and washed several times with water and purified by silica gel column chromatography (1:8 v/v ethyl acetate/petroleum ether) to provide a yellow solid (78.1% yield).
1H NMR (400 MHz, CDCl3) δ=3.09 (s, 6H), 3.69 (s, 3H), 6.83 (m, 2H), 6.95 (t, J=6.8 Hz, 1H), 7.04 (t, J=7.6 Hz, 1H), 7.13 (m, 3H), 7.47 (d, J=8.4 Hz, 1H), 8.03 (d, J=9.2 Hz, 2H), 8.43 (dd, J=8.0, 1.2 Hz, 1H), 8.48 (brs, 1H).
ESI-MS: [M+H]+ m/z 424.
Example 11
General Procedure for 5-acetamido-N-(2-methoxyphenyl)-2-((4-nitrophenyl)thio)benzamide (Compound 29)




Compound 24 (1.0 equiv.) was dissolved in DCM (30 mL) at room temperature. To this mixture was added acetic anhydride (1.2 equiv.), followed by the addition of DMAP (0.5 equiv.). After being stirred for 5 hours at room temperature, the reaction mixture was concentrated under reduced pressure. The crude residue was diluted ethyl acetate (60 mL), washed with water (2×15 mL), dried over anhydrous Na2SO4, filtered, and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (1:6 v/v ethyl acetate/petroleum ether) to provide a yellow solid; 96% yield;
1H NMR (400 MHz, CDCl3) δ=2.18 (s, 3H), 3.73 (s, 3H), 6.85 (d, J=8.4 Hz, 1H), 6.95 (t, J=7.6 Hz, 1H), 7.07 (t, J=8.0 Hz, 1H), 7.19 (d, J=8.8 Hz, 2H), 7.56 (d, J=8.8 Hz, 1H), 7.83 (d, J=1.6 Hz, 1H), 7.94 (d, J=8.0 Hz, 1H), 7.98 (br, 1H), 8.04 (d, J=9.2 Hz, 2H), 8.35 (d, J=7.6 Hz, 1H), 8.51 (br, 1H) ppm.
ESI-MS: [M+H]+ m/z 438.
Example 12
General Procedure for 2-amino-N-(2-methoxyphenyl)-6-(4-nitrop-henoxy)benzamide (Compound 48)




Prepared by proceeding in similar manner to example 1, use 4-Nitrophenol instead of 4-nitrothiophenol. Yellow solid; 38% yield;
1H NMR (400 MHz, CDCl3) δ=3.77 (s, 3 H), 5.88 (br, 2 H), 6.28 (d, J=8 Hz, 1 H), 6.60 (d, J=8 Hz, 1 H), 6.90 (m, 2 H), 7.67 (t, J=8 Hz, 1 H), 7.00 (d, J=8 Hz, 2 H), 7.18 (t, J=8 Hz, 1 H), 8.21 (d, J=8.8 Hz, 2 H), 8.42 (d, J=8 Hz, 1 H), 9.49 (s, 1 H) ppm.
ESI-MS: [M+Na]− m/z 402.
Example 13
General Procedure for 2-amino-N-(3-aminophenyl)-6-(4-nitroph-enylthio)benzamide (Compound 49)




Prepared by proceeding in similar manner to example 1, use m-phenylenediamine instead of o-anisidine. Yellow solid; 38% yield;
1H NMR (400 MHz, CDCl3) δ=3.62 (br, 2 H), 5.78 (br, 2 H), 6.31 (d, J=8.4 Hz, 1 H), 6.62 (d, J=7.6 Hz, 1 H), 7.01 (m, 1 H), 7.45 (d, J=8 Hz, 2 H), 7.48 (m, 2 H), 7.82 (d, J=8 Hz, 1 H), 7.93 (d, J=8.8 Hz, 2 H), 8.01 (d, J=7.2 Hz, 1 H), 8.52 (s, 1H) ppm.
ESI-MS: [M+K]+ m/z 418.
Example 14
General Procedure for 2-amino-N-(4-amino-2-methoxyphenyl)-6-(4-nitrophenylthio)benzamide (Compound 50)




Prepared by proceeding in similar manner to example 1, use 2-methoxybenzene-1,4-diamine instead of o-anisidine. Yellow solid; 69.8% yield;
1H NMR (400 MHz, CDCl3) δ=3.82 (s, 3 H), 5.66 (br, 2 H), 6.42 (d, J=8 Hz, 2 H), 6.67 (t, J=7.2 Hz, 2 H), 7.12 (t, J=8 Hz, 1 H), 7.56 (m, 4 H), 8.00 (s, 1 H), 8.33 (d, J=8 Hz, 1 H), 8.92 (br, 2 H) ppm.
ESI-MS: [M+H]+ m/z 411.
Example 15
General Procedure for 2-amino-N-(2,4-dimethoxyphenyl)-6-(4-nitrophenylthio)benzamide (Compound 51)




Prepared by proceeding in similar manner to example 1, use 2,4-dimethoxyaniline instead of o-anisidine. 61% yield;
1H NMR (400 MHz, CDCl3) δ=3.82 (s, 3 H), 3.84 (s, 3 H), 6.52 (d, J=9.6 Hz, 2 H), 6.69 (t, J=9.2 Hz, 2 H), 7.08 (t, J=8 Hz, 1 H), 7.65 (m, 4 H), 8.15 (s, 1 H), 8.29 (d, J=8.8 Hz, 1 H), 9.05 (br, 2 H) ppm.
ESI-MS: [M+K]− m/z 474.
Example 16
General Procedure for N-(2-methoxyphenyl)-2-nitro-6-(4-nitrophenylthio)benzamide (Compound 52)




Prepared by proceeding in similar manner to example 1, use 2-bromo-6-nitrobenzoic acid instead of 2-amino-6-bromobenzoic acid. 77% yield;
1H NMR (400 MHz, CDCl3) δ=3.73 (s, 3 H), 6.85 (d, J=7.2 Hz, 1 H), 7.00 (t, J=8 Hz, 1 H), 7.10 (t, J=8.8 Hz, 1 H), 7.30 (d, J=8.8 Hz, 2 H), 7.66 (t, J=8 Hz, 1 H), 7.85 (d, J=8.8 Hz, 2 H), 8.09 (d, J=9.2 Hz, 2 H), 8.28 (d, J=7.2 Hz, 1 H), 6.85 (d, J=7.2 Hz, 1 H) ppm.
ESI-MS: [M+K]− m/z 474.
Example 17
General Procedure for N-(2-aminophenyl)-2-nitro-6-(4-nitrophenylthio)benzamide (Compound 53)




Prepared by proceeding in similar manner to example 16, use o-Phenylenediamine instead of o-anisidine. 68.5% yield;
1H NMR (400 MHz, CDCl3) δ=3.57 (br, 2 H), 6.83 (d, J=8 Hz, 2 H), 7.14 (t, J=7.2 Hz, 1 H), 7.22 (d, J=8 Hz, 2 H), 7.40 (d, J=8 Hz, 2 H), 7.68 (t, J=7.6 Hz, 1 H), 7.85 (d, J=8 Hz, 1 H), 7.09 (d, J=8 Hz, 2 H), 8.31 (d, J=8 Hz, 1 H) ppm.
ESI-MS: [M+H] m/z 411.
Example 18
General Procedure for 3-(2-nitro-6-(4-nitrophenylthio)benzamildo)benzoic acid (Compound 54)




Prepared by proceeding in similar manner to example 16, use 3-aminobenzoic acid instead of o-anisidine. 43.1% yield;
1H NMR (400 MHz, DMSO) δ=7.43 (d, J=8.8 Hz, 2 H), 7.48 (d, J=8 Hz, 1 H), 7.71 (m, 2 H), 7.84 (t, J=8 Hz, 1 H), 8.03 (d, J=8 Hz, 1 H), 8.15 (d, J=8.8 Hz, 2 H), 8.21 (s, 1 H), 8.39 (d, J=8 Hz, 1 H), 10.89 (s, 1 H), 13.04 (br, 1 H) ppm.
ESI-MS: [M−H]− m/z 438.
Example 19
General Procedure for N-(4-aminophenyl)-2-nitro-6-(4-nitrophenylthio)benzamide (Compound 58)




Prepared by proceeding in similar manner to example 16, use p-phenylenediamine instead of o-anisidine. 43.1% yield;
1H NMR (400 MHz, CDCl3) δ=3.72 (br, 2 H), 6.66 (d, J=8 Hz, 1 H), 6.71 (d, J=8.4 Hz, 2 H), 7.25 (m, 1 H), 7.37 (d, J=8.8 Hz, 2 H), 7.47 (t, J=8 Hz, 1 H), 7.61 (t, J=8.8 Hz, 1 H), 7.80 (d, J=8 Hz, 1 H), 7.94 (d, J=8 Hz, 1 H), 7.11 (d, J=9.2 Hz, 1 H), 8.17 (d, J=8 Hz, 1 H) ppm.
ESI-MS: [M+H]+ m/z 411.
Example 20
General Procedure for N-(2-methoxyphenyl)-2-(4-nitrophenylthio)-6-(phenylsulfonamido)benzamide (Compound 56)




Compound 25 (1.0 equiv.) was dissolved in azabenzene (40 mL) at room temperature. To this mixture was added benzenesulfonyl chloride (1.2 equiv.). After being stirred for 10 Hours at room temperature, the reaction mixture was concentrated under reduced pressure. The crude residue was diluted ethyl acetate (50 mL), washed with water (3×20 mL), dried over anhydrous Na2SO4, filtered, and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (1:4 v/v ethyl acetate/petroleum ether) to provide a white solid. 67% yield;
1H NMR (400 MHz, CDCl3) δ=3.65 (s, 3H), 6.74 (d, J=8.0 Hz, 1H), 6.85 (t, J=7.6 Hz, 1H), 6.91 (d, J=8.0 Hz, 1H), 7.02 (t, J=7.6 Hz, 1H), 7.28 (m, 1H), 7.37 (t, J=8.0 Hz, 1H), 7.47 (t, J=7.6 Hz, 3H), 7.64 (m, 3H), 8.01 (m, 5H), 8.93 (s, 1H) ppm.
ESI-MS: [M+K]+ m/z 558.
Example 21
General Procedure for N-(2-methoxyphenyl)-2-(4-methylphenylsulfonamido)-6-((4-nitrophenyl)thio)benzamide (Compound 57)




Prepared by proceeding in similar manner to example 20, using Methyl-benzenesulfonyl chloride instead of benzenesulfonyl chloride. White solid; 83.8% yield;
1H NMR (400 MHz, CDCl3) δ=2.17 (s, 3H), 3.69 (s, 3H), 6.8 (d, J=8 Hz, 1H), 6.95 (d, J=8.8 Hz, 3H), 7.09 (m, 3H), 7.38 (d, J=8.0 Hz, 1H), 7.47 (t, J=8.0 Hz, 1H), 7.54 (d, J=8.0 Hz, 2H), 7.81 (d, J=8.0 Hz, 1H), 7.95 (s, 1H), 8.01 (d, J=8.8 Hz, 2H), 8.16 (d, J=8.0 Hz, 1H), 8.42 (s, 1H);
ESI-MS: [M+Na]+ m/z 572.09
Example 22
General Procedure for 2-(dimethylamino)-N-(2-methoxyphenyl)-6-((4-nitrophenyl)sulfonyl)benzamide (Compound 58)




Prepared by proceeding in similar manner to example 7, using compound 28 instead of compound 25. Yellow solid; 77.2% yield;
1H NMR (400MHz, CDCl3) δ=2.76 (s, 3H), 3.28 (s, 3H), 4.08 (s, 3H), 6.61 (d, J=8.0 Hz, 1H), 7.09 (t, J=7.6 Hz, 1H), 7.13 (d, J=8.0 Hz, 1H), 7.21 (d, J=7.6 Hz, 2H), 7.36 (m, 2H), 7.43 (t, J=6.4 Hz, 1H), 7.60 (d, J=9.2 Hz, 2H), 7.91 (d, J=8.0 Hz, 2H);
ESI-MS: [M+Na]+ m/z 478.10
Example 23
General Procedure for N-(2-methoxyphenyl)-2-(methylamino)-6-((4-nitrophenyl)sulfonyl)benzamide (Compound 59)




Prepared by proceeding in similar manner to example 7, using compound 27 instead of compound 25. White solid; 85.2% yield;
1H NMR (400 MHz, CDCl3) δ=3.29 (s, 3H), 4.03 (s, 3H), 4.73 (brs, 1H), 7.21 (dd, J=8.0, 0.8 Hz, 1H), 7.04 (td, J=8.0, 1.2 Hz, 1H), 7.15 (dd, J=8.0, 1.2 Hz, 1H), 7.24 (m, 3H), 7.41 (m, 2H), 7.57 (m, 2H), 7.95 (d, J=12.0 Hz, 2H);
ESI-MS: [M+Na]+ m/z 464.08
Example 24
General Procedure for N-(2-methoxyphenyl)-2-(4-methylphenyls-ulfonamido)-6-((4-nitrophenyl)sulfonyl)benzamide (Compound 60)




Prepared by proceeding in similar manner to example 7, using compound 57 instead of compound 25, White solid; 55% yield;
1H NMR (400 MHz, CDCl3) δ=2.17 (s, 3H), 3.64 (s, 3H), 6.77 (d, J=8.0 Hz, 1H), 6.95 (m, 2H), 7.09 (t, J=7.2 Hz, 1H), 7.19 (d, J=8.0 Hz, 1H), 7.42 (t, J=7.2 Hz, 2H), 7.61 (t, J=7.2 Hz, 1H), 7.81 (d, J=7.6 Hz, 1H), 7.95 (d, J=7.6 Hz, 2H), 8.10 (d, J=8.0 Hz, 1H), 8.26 (d, J=8.4 Hz, 2H), 8.33 (d, J=8.4 Hz, 2H), 9.18 (s, 1H);
ESI-MS: [M+Na]+ m/z 604.08
Example 25
General Procedure for N-(2-methoxyphenyl)-2-((4-nitrophenyl)sulfonyl)-6-(phenylsulfonamido)benzamide (Compound 61)




Prepared by proceeding in similar manner to example 7, using compound 56 instead of compound 25, White solid; 62% yield;
1H NMR (400 MHz, CDCl3) δ=3.64 (s, 3H), 6.77 (d, J=7.2 Hz, 1H), 6.95 (m, 2H), 7.09 (t, J=8.0 Hz, 1H), 7.44 (t, J=8.0 Hz, 2H), 7.49 (t, J=7.2 Hz, 1H), 7.61 (t, J=7.2 Hz, 2H), 7.95 (d, J=7.2 Hz, 3H), 8.10 (d, J=9.2 Hz, 1H), 8.27 (d, J=7.2 Hz, 2H), 8.32 (d, J=7.2 Hz, 2H), 9.18 (s, 1H);
ESI-MS: [M+Na]+ m/z 590.06
Example 26
General Procedure for N-(2-methoxyphenyl)-2-((4-nitrophenyl)thio)-6-(piperazinyl)benzamide (Compound 62)




Compound 25 (1.0 equiv.) was dissolved in DMF (40 mL) at room temperature. To this mixture bis(2-bromoethyl)amine (1.0 equiv.) was added, following the addition of NaOH (2.0 equiv.). After being stirred for 2 Hours at room temperature, the reaction mixture was poured into ice-cold water (200 mL) to get crude product. The crude solid was filtered and washed several times with water and purified by silica gel column chromatography (1:3 v/v ethyl acetate/petroleum ether) to provide a yellow solid (380.9 mg, 82% yield).
1H NMR (400 MHz, CDCl3) δ=1.11 (s, 2H), 1.60 (s, 2H), 2.48 (t, J=4.8 Hz, 2H), 3.13 (t, J=6.0 Hz, 2H), 3.81 (s, 3H), 5.30 (s, 1H), 6.91 (d, J=8.0 Hz, 1H), 7.02 (d, J=8.0 Hz, 3H), 7.13 (t, J=7.6 Hz, 1H), 7.32 (m, 2H), 7.88 (s, 1H), 8.11 (d, J=8.8 Hz, 2H), 8.36 (d, J=8.0 Hz, 1H), 9.46 (s, 1H);
ESI-MS: [M+H]+ m/z 465.16
Example 27
General Procedure for N-(2-methoxyphenyl)-2-morpholino-6-((4-nitrophenyl)thio)benzamide (Compound 63)




Prepared by proceeding in similar manner to example 26, using 2,2′-dibromodi-ethyl ether instead of bis(2-bromoethyl)amine, Yellow solid; 67% yield;
1H NMR (400 MHz, CDCl3) δ=1.33 (s, 2H), 1.74 (s, 2H), 2.55 (t, J=4.8 Hz, 2H), 3.21 (t, J=6.0 Hz, 2H), 3.82 (s, 3H), 7.02 (d, J=7.2 Hz, 1H), 7.12 (d, J=8.8 Hz, 3H), 7.23 (t, J=7.2 Hz, 1H), 7.32 (m, 2H), 7.91 (s, 1H), 8.22 (d, J=8.0 Hz, 2H), 8.32 (d, J=8.0 Hz, 1H), 9.46 (s, 1H);
ESI-MS: [M+H]+ m/z 466.14
Example 28
General Procedure for 2-((2-bromoethyl)amino)-N-(2-methoxyp-henyl)-6-((4-nitrophenyl)thio)benzamide (Compound 64)




Prepared by proceeding in similar manner to example 9, Yellow solid; 59.5% yield;
1H NMR (400 MHz, CDCl3) δ=3.27 (t, J=7.2 Hz, 2H), 3.45 (m, 2H), 3.87 (s, 3H), 4.14 (brs, 1H), 6.49 (d, J=9.2 Hz, 1H), 6.68 (d, J=4.0 Hz, 1H), 7.04 (m, 3H), 7.37 (m, 3H), 7.53 (t, J=4.0 Hz, 1H), 7.96 (d, J=8.0 Hz, 2H), 8.20 (s, 1H);
ESI-MS: [M+H]+ m/z 502.04
Example 29
General Procedure for diisopropyl(((2-((2-methoxyphenyl)carbamoyl)-3-((4-nitro-phenyl)thio)phenyl)amino)methyl)phosphonate (Compound 65)




Compound 25 (1.0 equiv.) was dissolved in MeCN (40 mL) and treated with anhydrous potassium carbonate (2.0 equiv.) at room temperature. To this mixture diisopropyl(bromomethyl)phosphonate (1.2 equiv.) was added via a micro syringe. After being stirred for 4 Hours at 60° C., the reaction mixture was concentrated under reduced pressure. The crude residue was diluted by ethyl acetate (50 mL), and washed with water (2×10 mL). Then it was dried over anhydrous Na2SO4, filtered, and concentrated under reduced pressure. The residue was purified by silica gel column chromatography (1:4 v/v ethyl acetate/petroleum ether) to provide a yellow solid (235.2 mg, 41% yield).
1H NMR (400 MHz, DMSO) δ=1.28 (m, 12H), 3.33 (s, 3H), 3.83 (m, 2H), 5.31 (brs, 1H), 6.39 (d, J=8.0 Hz, 1H), 6.71 (t, J=7.6 Hz, 2H), 7.04 (t, J=7.6 Hz, 1H), 7.42 (m, 3H), 7.55 (d, J=8.0 Hz, 1H), 7.88 (d, J=8.0 Hz, 2H), 8.03 (d, J=8.0 Hz, 1H), 8.56 (s, 1H);
ESI-MS: [M+H]+ m/z 574.18
Example 30
General Procedure for 2-(2-aminoacetamido)-N-(2-methoxyphenyl)-6-(4-nitrophenylthio)benzamide hydrochloride (Compound 66)




The compound 25 (1.0 equiv.), HOBt (1.2 equiv.) and EDCI (1.2 equiv.) were dissolved in DCM, stirring at room temperature. After that, glycine (1.0 equiv.) was slowly added into the mixture, stirring for 5 h. Then the reaction solution was concentrated under reduced pressure, and the concentrate was dissolved in ethyl acetate. The organic layer was once washed with brine, and dried over anhydrous Na2SO4. Then the organic layer was concentrated under reduced pressure. The concentrate with an appropriate amount of HCl was stirred for 2 hours, and filtered. The filter cake was washed with ethanol once and then washed with DCM to give a white solid; yield 45%;
1H NMR (400 MHz, DMSO): 3.244 (s, 2 H), 3.684 (s, 3 H), 4.941 (br, 2 H), 6.915 (t, J=7.6 Hz, 1 H), 7.015 (d, J=8 Hz, 1 H), 7.131 (t, J=7.2 Hz, 1 H), 7.343 (m, 3 H), 7.548 (t, J=8 Hz, 1 H), 7.875 (d, J=8 Hz, 1 H), 8.111 (d, J=8.8 Hz, 2 H), 8.412 (d, J=8 Hz, 1 H), 9.904 (s, 1 H) ppm.
ESI-MS: [M+H]− m/z 453.1.
Example 31
General Procedure for 2-(2-aminoacetamido)-N-(2-methoxyphenyl)-6-((4-nitrophenyl)sulfonyl)benzamide hydrochloride hydrochloride (Compound 67)




Prepared by proceeding in similar manner to example 30, use compound 46 instead of compound 25. White solid; 51% yield;
1H NMR (400 MHz, DMSO) δ=3.73 (S, 2H), 3.82 (S, 3H), 7.02 (t, J=6.8 Hz, 1H), 7.09 (d, J=7.6 Hz, 1H), 7.19 (t, J=7.2 Hz, 1H), 7.77 (t, J=6.8 Hz, 1H), 8.01 (t, J=7.6 Hz, 2H), 8.08 (d, J=7.6 Hz, 1H), 8.23 (d, J=8.4 Hz, 2H), 8.39 (m, 4H), 9.89 (S, 1H), 10.00 (br, 2H) ppm.
ESI-MS: [M+H]+ m/z 485.
Example 32
General Procedure for 2-(2,6-diaminohexanamido)-N-(2-methoxyphenyl)-6-((4-nitrophenyl)thio)benzamide hydrochloride (Compound 68)




Prepared by proceeding in similar manner to example 30, use lysine of glycine. white solid; 39% yield;
1H NMR (400 MHz, DMSO) δ=1.39 (m, 8H), 1.68 (S, 1H), 3.68 (S, 3H), 6.49 (S, 1H), 6.92 (t, J=7.6 Hz, 1H), 7.01 (d, J=8.0 Hz, 1H), 7.12 (t, J=7.6 Hz, 1H), 7.34 (m, 3H), 7.54 (t, J=7.6 Hz, 1H), 7.88 (d, J=7.6 Hz, 1H), 8.11 (d, J=8.0 Hz, 2H), 8.34 (d, J=8.0 Hz, 1H), 9.89 (S, 1H) ppm.
ESI-MS: [M+H]+ m/z 524.
Example 33
General Procedure for 2-amino-N-(2-iodophenyl)-6-((4-nitrophenyl)thio)benzamide (Compound 71)




Prepared by proceeding in similar manner to example 1, Yellow solid; 79% yield;
1H NMR (400 MHz, CDCl3) δ=4.61 (br, 2H), 6.86 (t, J=7.6 Hz, 2H), 6.99 (d, J=7.6 Hz, 1H), 7.28 (m, 4H), 7.78 (d, J=7.6 Hz, 1H), 8.03 (d, J=7.2 Hz, 3H), 8.11 (d, J=8.0 Hz, 1H) ppm.
ESI-MS: [M+Na]+ m/z 514.
Example 34
General Procedure for 2-amino-N-(2-iodophenyl)-6-((4-nitrophenyl)sulfonyl)benzamide (Compound 72)




Prepared by proceeding in similar manner to example 7, White solid; 51.4% yield;
1H NMR (400 MHz, CDCl3) δ=4.36 (br, 2H), 6.99 (m, 2H), 7.40 (t, J=8.0 Hz, 1H), 7.46 (t, J=7.2 Hz, 1H), 7.53 (d, J=7.6 Hz, 1H), 7.78 (s, 1H), 7.86 (d, J=7.6 Hz, 1H), 8.13 (d, J=7.6 Hz, 2H), 8.20 (d, J=8.0 Hz, 1H), 8.30 (d, J=8.0 Hz, 2H) ppm.
ESI-MS: [M+Na]+ m/z 546.
Example 35
General Procedure for 2-(2-amino-6-((4-nitrophenyl)thio)benzamildo)phenyl methanesulfonate (Compound 73)




Prepared by proceeding in similar manner to example 1, Yellow solid; 56% yield;
1H NMR (400 MHz, CDCl3) δ=3.13 (S, 3H), 3.22 (S, 3H), 4.48 (br, 2H), 6.83 (d, J=8.0 Hz, 1H), 6.97 (d, J=2.8 Hz, 1H), 7.19 (t, J=7.2 Hz, 1H), 7.23 (m, 4H), 7.31 (t, J=8.0 Hz, 1H), 8.05 (m, 1H), 8.35 (S, 1H) ppm.
ESI-MS: [M+Na]+ m/z 482.
Example 36
General Procedure for 2-amino-6-((3,5-dimethylphenyl)thio)-N-(2-methoxyphenyl)benzamide (Compound 74)




Prepared by proceeding in similar manner to example 1, White solid; 87.1% yield;
1H NMR (400 MHz, CDCl3) δ=2.20 (S, 6H), 3.78 (s, 3H), 4.54 (br, 2H), 6.63 (d, J=8.0 Hz, 1H), 7.69 (d, J=8.0 Hz, 1H), 6.87 (m, 2H), 6.89 (S, 2H), 6.97 (t, J=8.0 Hz, 1H), 7.08 (m, 2H), 8.42 (d, J=8.0 Hz, 1H), 8.48 (s, 1H) ppm.
ESI-MS: [M+Na]+ m/z 401.
Example 37
General Procedure for 2-amino-6-((3,5-dimethylphenyl)sulfonyl)-N-(2-methoxyphenyl)benzamide (Compound 75)




Prepared by proceeding in similar manner to example 7, Yellow solid; 62.8% yield;
1H NMR (400 MHz, CDCl3) δ=2.19 (S, 6H), 3.84 (S, 3H), 4.31 (br, 2H), 6.92 (t, J=8.0 Hz, 2H), 7.00 (t, J=8.0 Hz, 1H), 7.13 (m, 2H), 7.36 (m, 3H), 7.60 (d, J=8.0 Hz, 1H), 8.31 (d, J=8.0 Hz, 1H), 8.37 (S, 1H) ppm.
ESI-MS: [M+Na]+ m/z 438.
Example 38
General Procedure for 4-((3-amino-2-((2-methoxyphenyl)carbamoyl)phenyl)thio)benzoic acid (Compound 76)




Prepared by proceeding in similar manner to example 1, Yellow solid; 36% yield;
1H NMR (400 MHz, DMSO) δ=3.82 (S, 3H), 5.36 (br, 2H), 6.91 (t, J=8.0 Hz, 1H), 7.01 (d, J=8.0 Hz, 1H), 7.15 (m, 2H), 7.24 (d, J=8.0 Hz, 2H), 7.43 (d, J=8.0 Hz, 1H), 7.60 (d, J=8.0 Hz, 1H), 7.80 (d, J=8.0 Hz, 2H), 8.21 (S, 2H) ppm.
ESI-MS: [M+Na]+ m/z 417.
Example 39
General Procedure for 4-((3-amino-2-((2-methoxyphenyl)carbamoyl)phenyl)sulfonyl)benzoic acid (Compound 77)




Prepared by proceeding in similar manner to example 7, Yellow solid; 22% yield;
1H NMR (400 MHz, DMSO) δ=3.78 (S, 3H), 5.55 (br, 2H), 7.03 (m, 2H), 7.09 (d, J=8.0 Hz, 1H), 7.23 (m, 2H), 7.34 (t, J=7.6 Hz, 1H), 7.77 (d, J=7.6 Hz, 1H), 8.04 (m, 4H), 9.60 (S, 1H), 13.480 (br, 1H) ppm.
ESI-MS: [M+Na]+ m/z 449.
Example 40
General Procedure for 2-((2-aminoethyl)amino)-N-(2-methoxyphenyl)-6-((4-nitrophenyl)thio)benzamide (Compound 78)




Prepared by proceeding in similar manner to example 9, Yellow solid; 51% yield;
1H NMR (400 MHz, DMSO) δ=0.82 (m, 2H), 1.18 (m, 2H), 2.00 (br, 2H), 3.78 (S, 3H), 6.35 (m, 3H), 6.67 (t, J=7.6 Hz, 2H), 6.76 (m, 2H), 7.99 (d, J=8.0 Hz, 1H), 7.16 (m, 3H), 7.44 (d, J=8.0 Hz, 1H), 7.54 (S, 1H) ppm.
ESI-MS: [M+H]+ m/z 439.
Example 41
General Procedure for 2-((2-aminoethyl)amino)-N-(2-methoxyphenyl)-6-((4-nitrophenyl)sulfonyl)benzamide (Compound 79)




Prepared by proceeding in similar manner to example 7, Yellow solid; 49% yield;
1H NMR (400 MHz, DMSO) δ=0.85 (m, 2H), 1.26 (m, 2H), 2.09 (brs, 2H), 3.72 (s, 3H), 6.88 (d, J=8.0 Hz, 1H), 7.00 (m, 3H), 7.06 (s, 1H), 7.14 (t, J=7.6 Hz, 1H), 7.61 (t, J=8.0 Hz, 1H), 7.77 (d, J=8.0 Hz, 1H), 7.83 (d, J=8.0 Hz, 1H), 8.14 (d, J=9.2 Hz, 2H), 8.24 (d, J=7.2 Hz, 1H), 8.48 (s, 1H).
ESI-MS: [M+H]+ m/z 471.
Example 42
General Procedure for 2-((2-hydroxyethyl)amino)-N-(2-methoxyphenyl)-6-((4-nitrophenyl)thio)benzamide (Compound 80)




Prepared by proceeding in similar manner to example 9, Yellow solid; 66% yield.
1H NMR (400 MHz, CDCl3) δ=3.05 (t, J=8.0 Hz, 2H), 3.66 (m, 2H), 3.90 (s, 3H), 6.44 (d, J=8.0 Hz, 1H), 6.78 (d, J=8.0 Hz, 1H), 7.02 (m, 3H), 7.37 (m, 4H), 7.57 (m, 1H), 7.97 (d, J=7.2 Hz, 2H), 8.19 (s, 1H).
ESI-MS: [M+Na]+ m/z 460
Example 43
General Procedure for 2-((2-hydroxyethyl)amino)-N-(2-methoxyphenyl)-6-((4-nitrophenyl)sulfonyl)benzamide (Compound 81)




Prepared by proceeding in similar manner to example 7, yellow solid; 43% yield;
1H NMR (400 MHz, CDCl3) δ=3.68 (m, 2H), 3.96 (t, J=8.4 Hz, 2H), 4.02 (s, 3H), 6.69 (d, J=8.0 Hz, 1H), 7.07 (t, J=8.0 Hz, 1H), 7.14 (d, J=8.0 Hz, 1H), 7.24 (m, 3H), 7.43 (m, 2H), 7.57 (d, J=8.0 Hz, 3H), 7.99 (d, J=7.6 Hz, 2H);
ESI-MS: [M+Na]+ m/z 494.
Example 44
General Procedure for 2-((2-amino-2-oxoethyl)amino)-N-(2-methoxyphenyl)-6-((4-nitrophenyl)thio)benzamide (Compound 82)




Prepared by proceeding in similar manner to example 9, White solid; 86.1% yield;
1H NMR (400 MHz, DMSO) δ=3.78 (s, 3H), 5.34 (brs, 2H), 5.85 (s, 2H), 6.46 (m, 2H), 6.67 (t, J=7.2 Hz, 2H), 6.76 (t, J=7.2 Hz, 2H), 6.99 (d, J=8.0 Hz, 2H), 7.16 (m, 3H), 7.43 (d, J=7.2 Hz, 1H), 7.55 (s, 1H).
ESI-MS: [M+H]+ m/z 453.
Example 45
General Procedure for 2-(2-amino-3-phenylpropanamido)-N-(2-methoxyphenyl)-6-((4-nitrophenyl)sulfonyl)benzamide (Compound 83)




Prepared by proceeding in similar manner to example 31, Yellow solid; 43% yield;
1H NMR (400 MHz, DMSO) δ=2.88 (m, 1H), 3.14 (d, J=16.0 Hz, 2H), 3.44 (d, J=8.0 Hz, 1H), 3.69 (s, 3H), 4.35 (brs, 2H), 6.99 (m, 2H), 7.12 (t, J=8.0 Hz, 1H), 7.23 (d, J=8.0 Hz, 4H), 7.77 (t, J=8.0 Hz, 1H), 7.94 (d, J=4.0 Hz, 1H), 8.10 (d, J=8.0 Hz, 1H), 8.31 (m, 7H), 9.88 (s, 1H).
ESI-MS: [M+H]+ m/z 575.
Biological Activity Tests
The anti-HIV activity was determined by the “Guiding Principles of Anti HIV Drug Unclinical Pharmacodynamics” of SFDA which is tested by technology standard assay according to International Universal Standards and Methods. The results are shown in Table 1. Where in CC50, EC50 were measured twice and took the average.
From Table 1, we can see that most of the compounds can inhibit HIV in vitro. Especially compound 25, 46, 67 and 83, which bearing high efficiency, low toxicity and high TI. Thus these compounds are suitable to be novel inhibitors of vif for anti-HIV.










FIG. 1










C8166 cells
H9 cells













compound
CC50
EC50
TI
CC50
EC50
TI
















22
107.83
>200
0.54
>200
>200
—


23
>200
>200
—
>200
>200
—


24
172.21
2.59
66.58
>200
2.62
>76.34


25
65.40
0.21
310.02
152.94
0.74
206.68


27
80.57
24.03
3.35
123.48
98.45
1.25


28
93.04
83.84
1.11
77.23
98.45
0.78


29
109.72
73.50
1.49
74.62
>200
<0.37


45
>200
0.367
385.34
117.08
1.66
70.53


46
140.59
0.096
2081.59
>200
0.66
>303.03


47
—
—
—
137.82
4.3
32.05


48
—
—
—
76.60
35.87
2.14


49
—
—
—
>200
41.50
4.82


50
—
—
—
81.06
28.29
2.87


51
—
—
—
18.09
18.84
0.96


52
—
—
—
>200
>200
—


53
—
—
—
>200
43.69
>4.58


54
—
—
—
85.79
83.93
1.02


55
>200
>200
—
>200
>200
—


56
>200
24.48
>8.17
>200
137.08
>1.46


57
37.24
14.07
2.65
>200
16.81
>11.90


58
>200
99.97
>2.00
>200
102.89
>1.94


59
>200
63.68
>3.14
88.39
122.90
0.72


60
>200
91.32
>2.19
>200
>200
—


61
>200
46.94
>4.26
>200
>200
—


62
10.25
3.43
2.99
14.22
3.83
3.71


63
>200
53.31
>3.75
>200
>200
—


64
10.424
3.17
3.28
17.83
21.01
0.85


65
18.789
105.78
0.18
25.41
>200
0.13


66
78.263
0.81
97.01
72.27
0.16
451.69


67
165.488
0.43
388.04
94.87
0.12
790.58


68
115.617
0.94
122.45
90.09
2.38
37.85


71
>200
61.44
>3.26
>200
>200
—


72
>200
16.19
>12.35
>200
192.60
1.04


73
194.07
36.73
5.28
>200
>200
—


74
68.60
7.26
9.45
>200
>200
—


75
>200
>200
—
>200
>200
—


76
>200
92.05
>2.17
>200
100.3
1.99


77
>200
>200
—
>200
>200
—


78
24.23
16.94
1.43
16.75
19.91
0.84


79
90.86
93.53
0.97
99.47
100.82
0.99


80
93.51
19.44
4.81
116.38
19.15
6.08


81
102.26
89.10
1.15
72.70
101.99
0.71


82
>200
>200
—
>200
>200
—


83
178.23
0.45
396.07
102.44
0.15
682.93





CC50, EC50 (μg/mL)






Compound 67 and 83 are prodrugs of compound 46 (In C8166 TI=2081.59, in H9 TI=303.03). It was proved that they were hydrolyzed into 46 in vivo. It should be noted that the prodrugs also have the anti-HIV activity of their own (In C8166 TI=388.04 and 291.4, in H9 TI=790.58 and 756.32).










FIG. 1: Anti-HIV-1 activities of 67 and 46










C8166
H9














CC50
EC50

CC50
EC50



compound
(μg/mL)
(μg/mL)
TI
(μg/mL)
(μg/mL)
TI
















67
165.488
0.43
388.04
94.87
0.12
790.58


46
140.59
0.096
2018.59
>200
0.66
>303.03









The anti-HIV activities of 46 against different resistant viruses were also tested and showing low toxicity toward mutant strain. 46 can inhibit the pathological changes of C8166 induced by HIV-1IIIB as well as the reproduction of viruses in H9 cells. 46 has a good inhibition on HIV-174V, HIV-1A17, and HIV-1L10R/M46I/L63P/V82T/I84V as well as Clinical isolated strain such as HIV-1KM018 and HIV-1TC-1. (Table 2).










FIG. 2: Anti-HIV-1 activities of 46 in cell culturesa











Virus
EC50 (μg/mL)
TI (CC50/EC50)















HIV-1IIIB (C8166 cells)
0.096
2081.59



HIV-1IIIB (H9 cells)
0.66
>303.03



HIV-174V
0.81
173.57



HIV-1A17
18.72
>20



HIV-1L10R/M46I/L63P/V82T/I84V
0.83
169.39



HIVKM018
6.23
>31.65



HIV-1TC-1
0.11
>1818.18







aC8166 cells and H9 cells: human T-lymphoma cell line; HIV-1IIIB and HIV-174V: NNRTI-resistant virus strains; HIV-1A17: NVP resistant virus strains; HIV-1L10R/M46I/L63P/V82T/I84V: PI-resistant virus strains; HIVKM018 and HIV-1TC-1: clinical strains.






Meanwhile these compounds have good therapeutic effect in HIV-2. Compound 25, 46, 67 and 83 bear high TI and low toxicity.







TABLE 3







the active of compound 25, 46, 67


for HIV-2 ROD and HIV-2CBL-20










HIV-2 ROD
HIV-2 CBL-20














CC50
EC50

CC50
EC50



compound
(μg/ml)
(μg/ml)
TI
(μg/ml)
(μg/ml)
TI
















25
184.61
0.59
312.90
163.77
0.82
199.72


46
>200
0.41
487.8
>200
0.45
444.44


67
126.19
0.78
161.78
106.26
1.21
87.82





HIV-2 ROD Separated and got at Senegal in 1985; HIV-2CBL-20 Separated and got at Gambia.






Solubility is an important parameter of druggability. The solubility of prodrugs 66, 67 and 68 are good. The solubility of 67 in water with pH=7 can be as good as 1730.64 μg/ml. The solubility of 66 and 68 in aqueous solution (pH=2) can reach 1290 and 2845.5 μg/ml. They are with good solubility and can be formulated into an oral formulation. The prodrugs can be hydrolyzed into 46 which is with good fat-solubility and TI as well as distribution.
In pharmacokinetics, after oral gavage of 67 by 100 mg/kg, the max blood concentration of 46 can be as high as 21.662 μg/ml and it can be released in many times in vivo, reaching a bioavailability of 161.2%. (FIG. 1 and FIG. 2)
The Metabolism of 67 to 46 Medicine Curve and Bioavailability
















Cmax
AUC(0~)9
CL
F



(mg/L)
(mg/L * h)
(L/h/kg)
(%)




















oral (100 mg/kg)
21.662
387.758
4.878
162.2


Intravenous (50 mg/kg)
326.494
120.282
0.453









In toxicity test, the acute toxicity test of 67 and 46 were tested and no abnormal phenomenon occurred.
In pharmacodynamics, results show that 46 and its prodrug 67 are very safe even at a high dose (10 g/kg).
As for the stability of the drugs, those prodrugs possess the favorable stability by experimentation. For example, compound 67 was tested in solutions with PH=4.004, 6.864 and 9.182, and its degradation rate was 0.2767, 0.4956 and 9.182, respectively. 67 possess the favorable stability in acid condition while they prone to be hydrolyzed in alkaline solution. As to the Mechanism of action of the compounds, the possible binding mode between 46 and vif was predicted by docking There are five possible hydrogen bonds between them: two hydrogen bonds between the nitro group and Arg79 and Lys178, two hydrogen bonds between the oxygen atom of methoxyl group with His141 and Arg97, one hydrogen bond between the nitrogen atom of pyridine with Gly103. (The binding mode can be seen in FIG. 4)

## Claims

1. An anti-HIV compound represented by the following formula




wherein:
R5 is a straight chain or branched C1-8 alkoxy group;
X is S or SO2; and
R16 is H or




 where R20 is at least one amino acid selected from the group consisting of Ala, Arg, Asn, Asp, Cys, Glu, Gln, Gly, His, Ile, Leu, Lys, Met, Phe, Pro, Ser, Thr, Trp, Tyr and Val, provided that the at least one amino acid that is directly connected to the carbonyl group of R16 is free of an α-C carboxyl group.

2. The compound according to claim 1, wherein R16 is H.

3. The compound according to claim 2, wherein R5 is a C1-4 alkoxy group.

4. The compound according to claim 3, wherein R5 is a C1-2 alkoxy group.

5. The compound according to claim 3, wherein R5 is methoxyl.

6. The compound according to claim 1 having a structure selected from the group consisting of:

7. A pharmaceutically acceptable salt of a compound according to claim 1, wherein the salt is a hydrochloride, sulfate, phosphate or nitrate salt.

8. The pharmaceutically acceptable salt according to claim 7, which is the hydrochloride salt.

9. A method for treating HIV, said method comprising administering to a patient a compound according to claim 1.

10. The method of claim 9, wherein the compound is effective for treating at least one of HIV-1 and HIV-2 infection.