Azzindani/Open_Reaction_Data huggingface dataset:
Reaction SMILES: O1CCCC1.[C:6]([C:10]1[C:11]([C:22]([OH:24])=O)=[N:12][C:13]2[C:18]([C:19]=1[OH:20])=[CH:17][CH:16]=[C:15]([Cl:21])[CH:14]=2)([O:8][CH3:9])=[O:7].S(Cl)([Cl:27])=O>>[C:6]([C:10]1[C:11]([C:22]([Cl:27])=[O:24])=[N:12][C:13]2[C:18]([C:19]=1[OH:20])=[CH:17][CH:16]=[C:15]([Cl:21])[CH:14]=2)([O:8][CH3:9])=[O:7]
Reactant: COC(=O)c1c(C(=O)O)nc2cc(Cl)ccc2c1O
Reactant: O=S(Cl)Cl
Solvent: C1CCOC1
Product: COC(=O)c1c(C(=O)Cl)nc2cc(Cl)ccc2c1O
Temperature: 0 °C

Procedure:
The free base of 4-(trifluoromethoxy)phenyl hydrazine was prepared from the hydrochloride salt by treatment of the suspended salt (400 mg, 1.75 mM) in ethyl acetate (50 mL) with 2N sodium hydroxide(50 mL). The organic layer was separated, dried over magnesium sulfate and concentrated in vacuo to provide the free base of 4-(trifluoromethoxy)phenyl hydrazine (325 mg, 1.69 mM). This material was placed into anhydrous tetrahydrofuran (5 mL) and cooled to 0° C. under a nitrogen atmosphere. Concurrently, 3-carbomethoxy-7-chloro-4-hydroxyquinoline-2-carbonyl chloride was prepared from 3-carbomethoxy-7-chloro-4-hydroxyquinoline-2-carboxylic acid (121 mg, 0.43 mM) by heating to 60° C. in thionyl chloride (4 mL). After 3 hours the crude acid chloride was isolated by distilling away the excess thionyl chloride. The crude3-carbomethoxy-7-chloro-4-hydroxyquinoline-2-carbonyl chloride (130 mg, 0.43 mM) was then placed in anhydrous tetrahydrofuran (3 mL) at ambient temperature and added via cannula to the 4-(trifluoromethoxy)phenyl hydrazine solution. After 30 minutes the reaction mixture was poured into 1.0N hydrochloric acid producing a precipitate. The solid was isolated to yield the title compound (185 mg, 95%) as an off-white solid, mp 346-350° C.; MS 456 (M+H).
Reaction SMILES: [C:1](Cl)(Cl)=[S:2].[NH2:5][C:6]1[C:15]2[C:10](=[CH:11][CH:12]=[CH:13][CH:14]=2)[C:9]([CH:16]2[CH2:18][CH2:17]2)=[CH:8][CH:7]=1.C(N(C(C)C)CC)(C)C.Cl>ClCCl>[CH:16]1([C:9]2[C:10]3[C:15](=[CH:14][CH:13]=[CH:12][CH:11]=3)[C:6]([N:5]=[C:1]=[S:2])=[CH:7][CH:8]=2)[CH2:18][CH2:17]1
Reactant: Nc1ccc(C2CC2)c2ccccc12
Reactant: S=C(Cl)Cl
Agent: Cl
Solvent: ClCCl
Solvent: CCN(C(C)C)C(C)C
Product: S=C=Nc1ccc(C2CC2)c2ccccc12
Temperature: 0 °C
Reaction time: 0.08 h
Yield: 86 %

Procedure:
Thiophosgene (1.1 g, 9.7 mmol) was added to a stirred solution of 1-amino-4-cyclopropylnaphthalene (1.8 g, 9.7 mmol) and diisopropylethylamine (2 eq) in dichloromethane (50 mL) at 0° C. The reaction mixture was stirred for 5 min at 0° C. and then aqueous HCl (1% solution) was added. The organic layer was separated, washed with brine, dried over sodium sulfate, filtered and the solvent removed under reduced pressure. Hexane was added, and the resulting precipitate was filtered. The solvent was evaporated to yield 1-cyclopropyl-4-isothiocyanatonaphthalene (1.88 g, 86%).
Reaction SMILES: [Cl:1][C:2]1[CH:7]=[CH:6][C:5]([CH2:8][C:9]([O:11][CH3:12])=[O:10])=[CH:4][CH:3]=1.[Br:13]N1C(=O)CCC1=O>C(Cl)(Cl)(Cl)Cl>[Cl:1][C:2]1[CH:3]=[CH:4][C:5]([CH:8]([Br:13])[C:9]([O:11][CH3:12])=[O:10])=[CH:6][CH:7]=1
Reactant: O=C1CCC(=O)N1Br
Reactant: COC(=O)Cc1ccc(Cl)cc1
Solvent: ClC(Cl)(Cl)Cl
Product: COC(=O)C(Br)c1ccc(Cl)cc1
Yield: 103.5 %

Procedure:
To a solution of 102 g (0.55 mole) of methyl (4-chlorophenyl)acetate in 100 ml of carbon tetrachloride was added 97.9 g (0.55 mole) of N-bromosuccinimide. The resulting mixture was refluxed and irradiated with a 500 W bromo lamp for 5 hours. It was then cooled, filtered, and the filtrate was evaporated to dryness to give 150 g (103% yield) of methyl (4-chlorophenyl)bromoacetate.
Reaction SMILES: Br[CH:2]([CH3:9])[C:3](=O)[C:4]([O:6][CH3:7])=[O:5].[NH2:10][C:11]1[CH:16]=[CH:15][C:14]([N+:17]([O-:19])=[O:18])=[CH:13][N:12]=1>C(OCC)(=O)C>[CH3:9][C:2]1[N:12]2[CH:13]=[C:14]([N+:17]([O-:19])=[O:18])[CH:15]=[CH:16][C:11]2=[N:10][C:3]=1[C:4]([O:6][CH3:7])=[O:5]
Reactant: Nc1ccc([N+](=O)[O-])cn1
Reactant: COC(=O)C(=O)C(C)Br
Solvent: CCOC(C)=O
Product: COC(=O)c1nc2ccc([N+](=O)[O-])cn2c1C

Procedure:
Operations similar to Production Example 1-(2) were conducted using methyl 3-bromo-2-oxobutanoate and 2-amino-5-nitropyridine. The resulting solid was suspended in ethyl acetate, washed with saturated aqueous sodium hydrogencarbonate solution and purified by silica gel column chromatography (hexane/ethyl acetate=2/1) to provide the title compound as yellow crystals.
Reaction SMILES: C([O:3][C:4](=[O:21])[CH:5]([C:12]1[CH:17]=[CH:16][C:15]([N+:18]([O-:20])=[O:19])=[CH:14][CH:13]=1)[CH2:6][CH:7]1[CH2:11][CH2:10][CH2:9][CH2:8]1)C.[OH-].[Li+]>O1CCCC1.O>[CH:7]1([CH2:6][CH:5]([C:12]2[CH:17]=[CH:16][C:15]([N+:18]([O-:20])=[O:19])=[CH:14][CH:13]=2)[C:4]([OH:21])=[O:3])[CH2:11][CH2:10][CH2:9][CH2:8]1
Reactant: CCOC(=O)C(CC1CCCC1)c1ccc([N+](=O)[O-])cc1
Agent: [Li+]
Agent: [OH-]
Solvent: C1CCOC1
Solvent: O
Product: O=C(O)C(CC1CCCC1)c1ccc([N+](=O)[O-])cc1
Temperature: 25 °C
Reaction time: 21 h
Yield: 94.6 %

Procedure:
A solution of 3-cyclopentyl-2-(4-nitro-phenyl)-propionic acid ethyl ester (14.1 g, 48.06 mmol) in tetrahydrofuran/water (300 mL, 3:1) was treated with lithium hydroxide (4.35 g, 103.67 mmol). The reaction was stirred at 25° C. for 21 h. The tetrahydrofuran was then removed in vacuo. The residue was diluted with water (75 mL) and extracted with ether (3×75 mL). The aqueous layer was acidified to pH=1 with a 3N aqueous hydrochloric acid solution and extracted into methylene chloride (3×75 mL). The organics were washed with a saturated aqueous sodium chloride solution (2×100 mL), dried over magnesium sulfate, filtered, and concentrated in vacuo to afford 3-cyclopentyl-2-(4-nitro-phenyl)-propionic acid (11.97 g, 93.6%) as a yellow solid: mp 19-125° C.; EI-HRMS m/e calcd for C14H17NO4 (M+) 263.1157, found 263.1162.
Reaction SMILES: [CH3:1][C:2]1([CH3:14])[C:6]([CH3:8])([CH3:7])[O:5][B:4]([C:9]2[CH:10]=[N:11][NH:12][CH:13]=2)[O:3]1.Br[CH2:16][C:17]([NH2:19])=[O:18].C(=O)([O-])[O-].[Cs+].[Cs+]>C(#N)C>[CH3:1][C:2]1([CH3:14])[C:6]([CH3:7])([CH3:8])[O:5][B:4]([C:9]2[CH:13]=[N:12][N:11]([CH2:16][C:17]([NH2:19])=[O:18])[CH:10]=2)[O:3]1
Reactant: CC1(C)OB(c2cn[nH]c2)OC1(C)C
Reactant: NC(=O)CBr
Agent: O=C([O-])[O-]
Agent: [Cs+]
Solvent: CC#N
Product: CC1(C)OB(c2cnn(CC(N)=O)c2)OC1(C)C

Procedure:
A mixture of 4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole (50 mg, 0.2 mmol), 2-Bromoacetamide (43 mg, 0.31 mmol, Aldrich, Cat. No. 301272), and cesium carbonate (250 mg, 0.77 mmol) in acetonitrile (1 mL) was stirred at 90° C. for 2 h. After cooling it was quenched with water, extracted with ethyl acetate. The extract was washed with water twice, brine once; dried over Na2SO4. After filtration the filtrate was concentrated to yield 45 mg of the product which was directly used in the next step reaction without further purification. LCMS (M+H)+: m/z=252.1
Reaction SMILES: O.C([O:5][C@H:6]([CH2:11]Br)[CH2:7][C:8]([OH:10])=[O:9])(=O)C.CO.[OH-].[CH2:16]([N+:20]([CH2:29][CH2:30][CH2:31][CH3:32])([CH2:25][CH2:26][CH2:27][CH3:28])[CH2:21][CH2:22][CH2:23][CH3:24])[CH2:17][CH2:18][CH3:19]>>[CH2:29]([N+:20]([CH2:16][CH2:17][CH2:18][CH3:19])([CH2:21][CH2:22][CH2:23][CH3:24])[CH2:25][CH2:26][CH2:27][CH3:28])[CH2:30][CH2:31][CH3:32].[O:5]1[CH2:11][C@@H:6]1[CH2:7][C:8]([O-:10])=[O:9]
Reactant: CC(=O)O[C@H](CBr)CC(=O)O
Agent: CCCC[N+](CCCC)(CCCC)CCCC
Agent: [OH-]
Solvent: O
Solvent: CO
Product: O=C([O-])C[C@H]1CO1
Reaction time: 2 h

Procedure:
A solution of distilled water (10 ml), (S)-3-acetoxy-4-bromobutyric acid (0.9 g, 0.004 mol) and 1.0M methanol (12 ml, 0.012 mol) in tetrabutylammonium hydroxide was charged to 100 ml flask equipped with a thermometer, pH meter and agitator, and stirred at 0˜5° C. for 2 hours to give (S)-3,4-epoxybutyric acid tetrabutylammonium salt. It was confirmed by a NMR analysis that more than 99% (S)-3,4-epoxybutyric acid tetrabutylammonium salt was converted.
Reaction SMILES: C[O:2][C:3]1[CH:8]=[CH:7][C:6]([C:9]([C:11]([C:13]2[CH:18]=[CH:17][C:16]([O:19]C)=[CH:15][CH:14]=2)=[O:12])=[O:10])=[CH:5][CH:4]=1.Br>C(O)(=O)C>[OH:2][C:3]1[CH:4]=[CH:5][C:6]([C:9]([C:11]([C:13]2[CH:14]=[CH:15][C:16]([OH:19])=[CH:17][CH:18]=2)=[O:12])=[O:10])=[CH:7][CH:8]=1
Reactant: COc1ccc(C(=O)C(=O)c2ccc(OC)cc2)cc1
Agent: Br
Solvent: CC(=O)O
Product: O=C(C(=O)c1ccc(O)cc1)c1ccc(O)cc1

Procedure:
4,4'-Dimethoxybenzil (10 g), 90 ml glacial acetic acid and 160 ml 48% HBr were heated at reflux for 4 hours. The reaction mixture was poured into ice and the product collected by filtration. Dissolution of the solid into 10% aqueous sodium hydroxide, extraction with diethyl ether and acidification of the aqueous layer gave 4,4'-dihydroxybenzil which was recrystallized from 75% ethanol. Yield 7.5 g (84%). 1H NMR (acetone-d6) δ9.53 (s,2H, OH), 7.81, 6.98 (m, 8H, aromatic).
Reaction SMILES: [Br:1]N1C(=O)CCC1=O.[CH3:9][C:10]1[CH:11]=[C:12]([OH:17])[CH:13]=[C:14]([CH3:16])[CH:15]=1>C1(C)C=CC=CC=1>[Br:1][C:11]1[C:10]([CH3:9])=[CH:15][C:14]([CH3:16])=[CH:13][C:12]=1[OH:17]
Reactant: Cc1cc(C)cc(O)c1
Reactant: O=C1CCC(=O)N1Br
Solvent: Cc1ccccc1
Product: Cc1cc(C)c(Br)c(O)c1
Temperature: 25 °C
Reaction time: 2 h
Yield: 30637.6 %

Procedure:
N-bromosuccinimide (178 g, 1.00 mmol) was slowly added to a solution of toluene (1.0 L) containing 3,5-dimethylphenol (122 g, 1.00 mol) under ice-cooling condition, and then the mixture was warmed to room temperature and stirred for 2 hours. The mixture was concentrated under reduced pressure, and then the residue was suspended in hexane (400 mL) to remove insolubles by filtration. The filtrate was concentrated, and the obtained residue was purified by silica gel column chromatography (hexane-ethyl acetate 9:1) to give 61.6 g of the title compound (yield: 31%).
Reaction SMILES: C([Li])CCC.[CH2:6]([C@H:13]1[CH2:17][O:16][C:15](=[O:18])[NH:14]1)[C:7]1[CH:12]=[CH:11][CH:10]=[CH:9][CH:8]=1.[C:19]1([CH2:25][CH2:26][C:27](Cl)=[O:28])[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=1.[Cl-].[Na+]>CCCCCC.O1CCCC1>[CH2:6]([C@H:13]1[CH2:17][O:16][C:15](=[O:18])[N:14]1[C:27](=[O:28])[CH2:26][CH2:25][C:19]1[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=1)[C:7]1[CH:8]=[CH:9][CH:10]=[CH:11][CH:12]=1
Reactant: O=C1N[C@@H](Cc2ccccc2)CO1
Reactant: O=C(Cl)CCc1ccccc1
Agent: [Cl-]
Agent: [Li]CCCC
Agent: [Na+]
Solvent: CCCCCC
Solvent: C1CCOC1
Product: O=C(CCc1ccccc1)N1C(=O)OC[C@@H]1Cc1ccccc1
Reaction time: 0.5 h
Yield: 77.6 %

Procedure:
48.1 ml (77 mmole) of butyllithium (as a 1.6M solution in hexane) were added dropwise, at -78° C. and under an atmosphere of nitrogen, to a solution of 12.41 g (70 mmole) of (4S)-(-)-4-benzyl-2-oxazolidinone in 200 ml of anhydrous tetrahydrofuran, and the mixture was stirred for 30 minutes. At the end of this time, a solution of 13.0 g (77 mmole) of 3-phenylpropionyl chloride in 100 ml of anhydrous tetrahydrofuran was slowly added dropwise to the mixture, and the mixture was stirred for 1 hour. The mixture was then mixed with a saturated aqueous solution of sodium chloride and extracted with ethyl acetate. The organic layer was dried over anhydrous magnesium sulfate and concentrated by distillation under reduced-pressure. The residue was purified by column chromatography through silica gel (using a 1:4 by volume mixture of ethyl acetate and hexane as the eluent) to afford 16.8 g (yield 78%) of the title compound as white crystals, melting at 92°-95° C.
Reaction SMILES: [CH3:1][P:2](=[O:7])([O:5][CH3:6])[O:3][CH3:4].[Li]CCCC.C[O:14][C:15](=O)[CH2:16][C:17]1[CH:22]=[CH:21][CH:20]=[C:19]([Cl:23])[CH:18]=1.C(O)(=O)C>C1COCC1>[CH3:4][O:3][P:2]([CH2:1][C:15](=[O:14])[CH2:16][C:17]1[CH:22]=[CH:21][CH:20]=[C:19]([Cl:23])[CH:18]=1)(=[O:7])[O:5][CH3:6]
Reactant: COC(=O)Cc1cccc(Cl)c1
Reactant: COP(C)(=O)OC
Agent: [Li]CCCC
Solvent: CC(=O)O
Solvent: C1CCOC1
Product: COP(=O)(CC(=O)Cc1cccc(Cl)c1)OC
Temperature: 25 °C
Reaction time: 1 h
Yield: 23.3 %

Procedure:
To a solution of dimethyl methylphosphonate (17.93 g, 144 mmol) in THF (270 mL) at −78° C. was slowly added n-BuLi (2.5M, 64.2 mL, 160.6 mmol). The reaction mixture was stirred for 1 h and (3-chloro-phenyl)-acetic acid methyl ester (26.93 g, 146 mmol) was slowly added. The reaction mixture was allowed to warm to room temperature and was stirred for 24 h. Acetic acid (15 mL) was added and the volatiles were removed in vacuo. The residue was diluted with CH2Cl2 and the organic solution was washed carefully with saturated aqueous NaHCO3 (3 times). The organic layer was dried (MgSO4), filtered and concentrated in vacuo. Purification by medium pressure chromatography (20% EtOAc in hexanes to EtOAc) provided the title compound (9.28 g).
Reaction SMILES: [H-].[Na+].N#N.[Cl:5][C:6]1[CH:11]=[CH:10][C:9]([OH:12])=[CH:8][N:7]=1.Cl[CH2:14][O:15][CH3:16]>CN(C=O)C>[Cl:5][C:6]1[CH:11]=[CH:10][C:9]([O:12][CH2:14][O:15][CH3:16])=[CH:8][N:7]=1
Reactant: Oc1ccc(Cl)nc1
Reactant: COCCl
Agent: N#N
Agent: [H-]
Agent: [Na+]
Solvent: CN(C)C=O
Product: COCOc1ccc(Cl)nc1
Reaction time: 1.5 h
Yield: 96.5 %

Procedure:
Sodium hydride (60% dispersion in oil, 1.83 g, 46.0 mmol) was suspended in anhydrous DMF (50 mL) at under N2 at room temperature with stirring. A solution of 2-chloro-5-hydroxy-pyridine (5.0 g, 38.2 mmol) in anhydrous DMF (20 mL) was added dropwise over 30 min. Stirring at room temperature was continued for 1.5 hours. Chloromethyl methylether (3.32 mL, 44.1 mmol) was next added neat over 20 min. Stirring was continued at room temperature for 12 hours. The mixture was partitioned between water and EtOAc. The organics were washed with brine, dried over Na2SO4, filtered and concentrated. The crude residue was chromatographed on silica gel, eluting with 20% EtOAc in Hexanes to provide the desired product as a clear oil (6.4 g, 96%). 1H NMR (400 MHz, CDCl3): δ 8.18 (s, 1H), 7.36 (d, J=8.6 Hz, 1H), 7.23 (d, J=8.6 Hz, 1H), 5.19 (s, 2H), 3.50 (s, 3H).
Reaction SMILES: [N:1]([O-])=O.[Na+].[CH2:5]([C:9]1[CH:15]=[CH:14][C:12]([NH2:13])=[CH:11][CH:10]=1)[CH2:6][CH2:7][CH3:8].[Sn](Cl)(Cl)(Cl)Cl>O.Cl>[CH2:5]([C:9]1[CH:10]=[CH:11][C:12]([NH:13][NH2:1])=[CH:14][CH:15]=1)[CH2:6][CH2:7][CH3:8]
Reactant: CCCCc1ccc(N)cc1
Reactant: O=N[O-]
Agent: Cl
Agent: Cl[Sn](Cl)(Cl)Cl
Agent: [Na+]
Solvent: O
Product: CCCCc1ccc(NN)cc1
Temperature: 0 °C
Reaction time: 0.25 h
Yield: 66 %

Procedure:
Sodium nitrite (11.74 g, 0.17 mol) in water (50 mL) was added over 30 min to an ice-cooled and stirred suspension of 4-n-butylaniline (24.30 g, 0.16 mol) in 6 N hydrochloric acid (190 mL). After an additional 15 min, a suspension of tin chloride dehydrate (108.3 g, 0.4 mol) in 6 N hydrochloric acid (190 mL) was added slowly, and the resulting suspension was stirred at 0° C. for 3 h. The solid was filtered and dissolved in a mixture of 40% potassium hydroxide solution (200 mL) and ethyl acetate (200 mL). The organic layer was separated and the aqueous layer was further extracted with ethyl acetate. The combined organic extracts were washed with 10% hydrochloric acid (120 mL), a solid started to develop in the organic layer. After cooled it to 0° C., the solid was filtered. The organic layer was separated, dried over Na2SO4, and the solvent was evaporated. The resulting solid was recrystallized from ethanol to afford a white solid (17.35 g, 54%). 1H NMR (300 MHz, DMSO-d6): δ 10.18 (s, 3H), 7.10 (d, 2H, J=8.4 Hz), 6.92 (d, 2H, J=8.7 Hz), 2.51 (t, 2H, J=7.5 Hz), 1.50 (pentet, 2H, J=7.5 Hz), 1.27 (sextet, 2H, J=7.8 Hz), 0.88 (t, 3H, J=7.5 Hz).
Reaction SMILES: [F:1][C:2]([F:7])([F:6])[C:3]([OH:5])=[O:4].[O:8]=[C:9]1[C:17]2[C:12](=[CH:13][CH:14]=[CH:15][CH:16]=2)[C:11](=[O:18])[N:10]1[O:19][C@H:20]1[CH2:24][CH2:23][N:22](C(OC(C)(C)C)=O)[CH2:21]1>C(Cl)Cl>[NH:22]1[CH2:23][CH2:24][C@H:20]([O:19][N:10]2[C:11](=[O:18])[C:12]3[C:17](=[CH:16][CH:15]=[CH:14][CH:13]=3)[C:9]2=[O:8])[CH2:21]1.[F:1][C:2]([F:7])([F:6])[C:3]([OH:5])=[O:4]
Reactant: CC(C)(C)OC(=O)N1CC[C@H](ON2C(=O)c3ccccc3C2=O)C1
Solvent: O=C(O)C(F)(F)F
Solvent: ClCCl
Product: O=C1c2ccccc2C(=O)N1O[C@H]1CCNC1
Temperature: 25 °C
Reaction time: 17 h

Procedure:
Trifluoroacetic acid (3.42 g, 30 mmol) was added at 0° C. to a solution of (S)-tert-butyl 3-(1,3-dioxoisoin dolin-2-yloxy)pyrrolidin-1-carboxylate (3.32 g, 10 mmol) in CH2Cl2 (25 ml), and the whole was stirred at room temperature for 17 hours. The reaction was concentrated in vacuo and the residue was triturated with diethyl ether (100 ml) to give (S)-2-(pyrrolidin-3-yloxy)isoindoline-1,3-dione) trifluoroacetic acid salt (2.77 g, 80%) as a white solid.
Reaction SMILES: [CH3:1][C:2]1[CH:3]=[CH:4][C:5]2[O:9][CH:8]=[N:7][C:6]=2[CH:10]=1.[Br:11]N1C(=O)CCC1=O.N(C(C)(C)C#N)=NC(C)(C)C#N>C(Cl)(Cl)(Cl)Cl>[Br:11][CH2:1][C:2]1[CH:3]=[CH:4][C:5]2[O:9][CH:8]=[N:7][C:6]=2[CH:10]=1
Reactant: Cc1ccc2ocnc2c1
Reactant: O=C1CCC(=O)N1Br
Agent: CC(C)(C#N)N=NC(C)(C)C#N
Solvent: ClC(Cl)(Cl)Cl
Product: BrCc1ccc2ocnc2c1
Yield: 39.6 %

Procedure:
A mixture of 5-methylbenzoxazole (200 mg, 1.50 mmol), N-bromosuccinimide (321 mg, 1.80 mmol), and 2,2′-azobisisobutyronitrile (37 mg, 0.23 mmol) in CCl4 (3 mL) was heated at reflux for 22 h. The mixture was filtered and the filtrate was concentrated under reduced pressure. Purification of the crude material on silica gel (5% EtOAc/hexanes) gave the title compound as a colourless crystals (126 mg, 39%). 1H NMR (CDCl3) δ4.64 (s, 2H), 7.46 (dd, 1H, J=8.6, 1.7 Hz), 7.57 (d, 1H, J=8.4 Hz), 7.83 (d, 1H, J=1.2 Hz), 8.12 (s, 1H).
Reaction SMILES: [C:1]([OH:7])([C:3]([F:6])([F:5])[F:4])=[O:2].[CH2:8]([O:15][N:16]1[C:22](=[O:23])[N:21]2[CH2:24][C@H:17]1[CH2:18][CH2:19][C@H:20]2[C:25]([NH:27][NH:28]C(OC(C)(C)C)=O)=[O:26])[C:9]1[CH:14]=[CH:13][CH:12]=[CH:11][CH:10]=1>C(Cl)Cl>[OH:7][C:1]([C:3]([F:6])([F:5])[F:4])=[O:2].[CH2:8]([O:15][N:16]1[C:22](=[O:23])[N:21]2[CH2:24][C@H:17]1[CH2:18][CH2:19][C@H:20]2[C:25]([NH:27][NH2:28])=[O:26])[C:9]1[CH:14]=[CH:13][CH:12]=[CH:11][CH:10]=1
Reactant: CC(C)(C)OC(=O)NNC(=O)[C@@H]1CC[C@@H]2CN1C(=O)N2OCc1ccccc1
Solvent: O=C(O)C(F)(F)F
Solvent: ClCCl
Product: NNC(=O)[C@@H]1CC[C@@H]2CN1C(=O)N2OCc1ccccc1
Temperature: 25 °C
Reaction time: 1 h
Yield: 93 %

Procedure:
TFA (15 mL) was added dropwise to a solution of tert-butyl 2-((2S,5R)-6-(benzyloxy)-7-oxo-1,6-diazabicyclo[3.2.1]octane-2-carbonyl)hydrazinecarboxylate (3 g, 7.7 mmol) in DCM (30 mL) at 0° C. The resulting mixture was stirred at rt for 1 h, and then concentrated. The residue was further dried under high vacuum and washed with Et2O (3×) to afford (2S,5R)-6-(benzyloxy)-7-oxo-1,6-diazabicyclo[3.2.1]octane-2-carbohydrazide TFA salt (3 g, 93%) as a white solid. ESI-MS (EI+, m/z): 291 [M+H]+.
Reaction SMILES: [N+:1]([C:4]1[CH:9]=[CH:8]C(C)=[CH:6][CH:5]=1)([O-:3])=[O:2].[NH4+].[Br-].[C:13]([OH:16])(=[O:15])[CH3:14]>>[N+:1]([C:4]1[CH:9]=[CH:8][C:14]([C:13]([OH:16])=[O:15])=[CH:6][CH:5]=1)([O-:3])=[O:2]
Reactant: Cc1ccc([N+](=O)[O-])cc1
Reactant: CC(=O)O
Agent: [Br-]
Agent: [NH4+]
Product: O=C(O)c1ccc([N+](=O)[O-])cc1

Procedure:
750 g of p-nitrotoluene was oxidized in 2250 ml of glacial acetic acid, after the addition of 15 g of NH4Br, 4.5 g of Co(OAc)2 . 4H2O and 4.5 g of Mn(OAc)2 . 4H2O, at a reaction temperature of 175° C. The reaction product was washed and dried as before. 795 g (87% of the theory) of brown-discolored p-nitrobenzoic acid was obtained, having a melting point of 235°-36° C. The solution of 1 g of the product in 10 g of dimethylsulfoxide has a value of 40 on the iodine color scale. After recrystallization three times from glacial acetic acid, the melting point was 237°-40° C, while the iodine number remained unchanged.
Reaction SMILES: C1(O[C:8](=[O:16])[NH:9][C:10]2[CH:11]=[N:12][CH:13]=[CH:14][CH:15]=2)C=CC=CC=1.[F:17][C:18]1([F:34])[O:22][C:21]2[CH:23]=[CH:24][C:25]([CH2:27][N:28]3[CH2:33][CH2:32][NH:31][CH2:30][CH2:29]3)=[CH:26][C:20]=2[O:19]1.O>CS(C)=O>[N:12]1[CH:13]=[CH:14][CH:15]=[C:10]([NH:9][C:8]([N:31]2[CH2:32][CH2:33][N:28]([CH2:27][C:25]3[CH:24]=[CH:23][C:21]4[O:22][C:18]([F:34])([F:17])[O:19][C:20]=4[CH:26]=3)[CH2:29][CH2:30]2)=[O:16])[CH:11]=1
Reactant: FC1(F)Oc2ccc(CN3CCNCC3)cc2O1
Reactant: O=C(Nc1cccnc1)Oc1ccccc1
Solvent: O
Solvent: CS(C)=O
Product: O=C(Nc1cccnc1)N1CCN(Cc2ccc3c(c2)OC(F)(F)O3)CC1
Temperature: 25 °C
Reaction time: 16 h
Yield: 84 %

Procedure:
To a solution of pyridine-3-yl-carbamic acid phenyl ester (9.08 g, 42.4 mmol) in DMSO (84 mL) was added 1-(2,2-difluoro-benzo[1,3]dioxol-5-ylmethyl)-piperazine (11.4 g, 44.5 mmol). The reaction mixture was stirred at room temperature for 16 h, then treated with water (130 mL). The resulting solid was isolated by filtration, rinsed with water (4×50 mL) and dried under vacuum. The solid was recrystallized (EtOH—H2O) to give 4-(2,2-difluoro-benzo[1,3]dioxol-5-ylmethyl)-piperazine-1-carboxylic acid pyridin-3-ylamide (13.4 g, 84%). MS (ESI+): calcd for C18H18F2N4O3 m/z 376.13. found 377.1 (M+H)+. 1H NMR (CDCl3): 8.46 (d, J=2.5 Hz, 1H), 8.23-8.21 (m, 1H), 7.99-7.96 (m, 1H), 7.22-7.19 (m, 2H), 7.11 (s, 1H), 6.99-6.98 (m, 2H), 3.54-3.52 (m, 4H), 3.49 (s, 2H, 2.46-2.44 (m, 4H).
Reaction SMILES: [Br:1][C:2]1[CH:7]=[CH:6][C:5]([C:8](=[O:10])[CH3:9])=[CH:4][CH:3]=1.[CH2:11](O)[CH2:12][OH:13].C1(C)C=CC(S(O)(=O)=O)=CC=1.O>C1(C)C=CC=CC=1>[CH3:9][C:8]1([C:5]2[CH:6]=[CH:7][C:2]([Br:1])=[CH:3][CH:4]=2)[O:13][CH2:12][CH2:11][O:10]1
Reactant: OCCO
Reactant: CC(=O)c1ccc(Br)cc1
Agent: Cc1ccc(S(=O)(=O)O)cc1
Solvent: Cc1ccccc1
Solvent: O
Product: CC1(c2ccc(Br)cc2)OCCO1

Procedure:
In 1200 milliliters of toluene in a flask equipped with a Dean-Stark tube are dissolved 100 grams of p-bromoacetophenone; and to this solution is added 140 grams of ethylene glycol and 5 grams of p-toluenesulphonic acid. This mixture is refluxed until no further water collects in the Dean-Stark tube. After distilling off 600 milliliters of toluene, the remaining solution is decanted off and evaporated to dryness in vacuo to obtain 2-methyl-2-(p-bromophenyl)-1,3-dioxolane.
Reaction SMILES: [C:1]([C:3]1[CH:8]=[CH:7][C:6]([OH:9])=[CH:5][CH:4]=1)#[N:2].C([O-])([O-])=O.[K+].[K+].[Br:16][CH2:17][CH2:18]Br>CC#N>[Br:16][CH2:17][CH2:18][O:9][C:6]1[CH:7]=[CH:8][C:3]([C:1]#[N:2])=[CH:4][CH:5]=1
Reactant: N#Cc1ccc(O)cc1
Reactant: BrCCBr
Agent: O=C([O-])[O-]
Agent: [K+]
Solvent: CC#N
Product: N#Cc1ccc(OCCBr)cc1
Yield: 44.5 %

Procedure:
A mixture of 4-cyanophenol (35.7 g, 0.3 mol), K2CO3 (41.4 g, 0.3 mol) and 1,2-dibromoethane (561 g, 3.0 mol) in MeCN (450 mL) was stirred under reflux overnight. The mixture was filtered and evaporated to give 30.2 g (45%) of the sub-title compound, which was used without further purification.
Reaction SMILES: [CH3:1][O:2][C:3]1[CH:8]=[CH:7][C:6]([NH2:9])=[CH:5][CH:4]=1.C(N(CC)CC)C.[C:17](OC(=O)C)(=[O:19])[CH3:18]>ClCCl>[CH3:1][O:2][C:3]1[CH:8]=[CH:7][C:6]([NH:9][C:17](=[O:19])[CH3:18])=[CH:5][CH:4]=1
Reactant: CC(=O)OC(C)=O
Reactant: COc1ccc(N)cc1
Solvent: CCN(CC)CC
Solvent: ClCCl
Product: COc1ccc(NC(C)=O)cc1
Reaction time: 1 h
Yield: 104.7 %

Procedure:
Paraanisidine (136.34 g, 1.108 mol) was dissolved in dichloromethane (500 ml), triethylamine (234 ml, 1.66 mol) and acetic anhydride (114.8 ml, 1.22 mol) were added thereto, and the resulting mixture was stirred for 1 hour. After completion of reaction, the reaction solution was concentrated. Water (800 ml) was added to the residue and the resulting mixture was stirred and filtered to give 168.0 g (1.16 mol, Yield 92%) of the title compound.
Reaction SMILES: [Br:1][C:2]1[CH:3]=[C:4]([CH:8]=[CH:9][C:10]=1[OH:11])[C:5]([OH:7])=[O:6].S(=O)(=O)(O)O.[OH-].[Na+].[CH3:19]O>>[Br:1][C:2]1[CH:3]=[C:4]([CH:8]=[CH:9][C:10]=1[OH:11])[C:5]([O:7][CH3:19])=[O:6]
Reactant: O=C(O)c1ccc(O)c(Br)c1
Reactant: CO
Agent: O=S(=O)(O)O
Agent: [Na+]
Agent: [OH-]
Product: COC(=O)c1ccc(O)c(Br)c1
Yield: 85 %

Procedure:
A solution of 3-bromo-4-hydroxybenzoic acid (50.4 g, 232 mmol) and concentrated sulfuric acid (17 mL) in methanol (330 mL) was heated under reflux for 24 hr. The reaction mixture was neutralized with aqueous sodium hydroxide solution, methanol was evaporated under reduced pressure, and the mixture was extracted with ethyl acetate. The extract was washed with aqueous sodium bicarbonate solution and saturated brine, dried over anhydrous sodium sulfate, and concentrated under reduced pressure. The obtained crystals were washed with diethyl ether/hexane to give the title compound (45.5 g, yield 85%) as pale-pink crystals.