1,2-dimethylhydrazine;dihydrochloride

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Under ice cooling, 4,5-bis(bromomethyl)thiazole (600 mg) and 1,2-dimethylhydrazine dihydrochloride (294 mg) were suspended in ethanol (20 ml). Triethylamine (1.23 ml) was added in one portion to the reaction mixture, followed by stirring at room temperature for 30 minutes and then, at 50° C. for 30 minutes. The solvent was distilled off and the residue was purified by chromatography on a silica gel column (5% methanol—methylene chloride), whereby the title compound (90 mg, 24%) was obtained. at 50° C. for 30 minutes The solvent was distilled off the residue was purified by chromatography on a silica gel column (5% methanol—methylene chloride), whereby the title compound (90 mg, 24%) was obtained

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a mixture of 0.42 g of N,N′-dimethylhydrazine dihydrochloride, five drops of water, 0.87 g of potassium carbonate and 10 ml of tetrahydrofuran was added 0.59 g of 6,8-dibromo-2-[4-bromo-1-(3-chloro-2-pyridinyl)-1H-pyrrol-2-yl]-4H-3,1-benzoxazine-4-one. The resulting mixture was stirred at room temperature for 2 hours. Water was poured into the reaction mixture, and the mixture was extracted with ethyl acetate. The organic layer was washed successively with water and an aqueous saturated sodium chloride solution, dried over anhydrous magnesium sulfate, and concentrated under reduced pressure. The resulting residue was subjected to silica gel chromatography to obtain 0.52 g of 4-bromo-N-[4,6-dibromo-2-(N,N′-dimethylhydrazinocarbonyl)phenyl]-1-(3-chloro-2-pyridinyl)-1H-pyrrole-2-carboxamide of the formula: the mixture was extracted with ethyl acetate The organic layer was washed successively with water an aqueous saturated sodium chloride solution, dried over anhydrous magnesium sulfate concentrated under reduced pressure

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a mixture of 0.42 g of N,N′-dimethylhydrazine dihydrochloride, five drops of water, 0.87 g of potassium carbonate and 10 ml of tetrahydrofuran was added 0.59 g of 6,8-dibromo-2-[4-bromo-1-(3-chloro-2-pyridinyl)-1H-pyrrol-2-yl]-4H-3,1-benzoxazine-4-one. The resulting mixture was stirred at room temperature for 2 hours. Water was poured into the reaction mixture, and the mixture was extracted with ethyl acetate. The organic layer was washed successively with water and an aqueous saturated sodium chloride solution, dried over anhydrous magnesium sulfate, and concentrated under reduced pressure. The resulting residue was subjected to silica gel chromatography to obtain 0.52 g of 4-bromo-N-[4,6-dibromo-2-(N,N′-dimethylhydrazinocarbonyl)phenyl]-1-(3-chloro-2-pyridinyl)-1H-pyrrole-2-carboxamide of the formula: the mixture was extracted with ethyl acetate The organic layer was washed successively with water an aqueous saturated sodium chloride solution, dried over anhydrous magnesium sulfate concentrated under reduced pressure

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a mixture of 0.42 g of N,N′-dimethylhydrazine dihydrochloride, five drops of water, 0.87 g of potassium carbonate and 10 ml of tetrahydrofuran was added 0.60 g of 2-[3-bromo-1-(3-chloro-2-pyridinyl)-1H-pyrazol-5-yl]-6,8-dibromo-4H-3,1-benzoxazine-4-one. The resulting mixture was stirred at room temperature for 19 hours. Water was poured into the reaction mixture, and the mixture was extracted with ethyl acetate. The organic layer was washed successively with water and an aqueous saturated sodium chloride solution, dried over anhydrous magnesium sulfate, and concentrated under reduced pressure. The resulting residue was subjected to silica gel chromatography to obtain 0.51 g of 3-bromo-N-[4,6-dibromo-2-(N,N′-dimethylhydrazinocarbonyl)phenyl]-1-(3-chloro-2-pyridinyl)-1H-pyrazole-5-carboxamide of the formula: the mixture was extracted with ethyl acetate The organic layer was washed successively with water an aqueous saturated sodium chloride solution, dried over anhydrous magnesium sulfate concentrated under reduced pressure

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a mixture of 0.42 g of N,N′-dimethylhydrazine dihydrochloride, five drops of water, 0.87 g of potassium carbonate and 10 ml of tetrahydrofuran was added 0.60 g of 2-[3-bromo-1-(3-chloro-2-pyridinyl)-1H-pyrazol-5-yl]-6,8-dibromo-4H-3,1-benzoxazine-4-one. The resulting mixture was stirred at room temperature for 19 hours. Water was poured into the reaction mixture, and the mixture was extracted with ethyl acetate. The organic layer was washed successively with water and an aqueous saturated sodium chloride solution, dried over anhydrous magnesium sulfate, and concentrated under reduced pressure. The resulting residue was subjected to silica gel chromatography to obtain 0.51 g of 3-bromo-N-[4,6-dibromo-2-(N,N′-dimethylhydrazinocarbonyl)phenyl]-1-(3-chloro-2-pyridinyl)-1H-pyrazole-5-carboxamide of the formula: the mixture was extracted with ethyl acetate The organic layer was washed successively with water an aqueous saturated sodium chloride solution, dried over anhydrous magnesium sulfate concentrated under reduced pressure

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a mixture of 0.29 g of N,N′-dimethylhydrazine dihydrochloride, 1 ml of water, 0.31 g of potassium carbonate and 10 ml of N,N-dimethylformamide was added 1.0 g of 2-[4-bromo-1-(3-chloro-2-pyridinyl)-1H-pyrrol-2-yl]-6-chloro-8-methyl-4H-3,1-benzoxazine-4-one. The resulting mixture was stirred at room temperature for 6 hours. Water was poured into the reaction mixture, and the mixture was extracted with ethyl acetate three times. The organic layers were combined, dried over anhydrous sodium sulfate, and concentrated under reduced pressure. The resulting residue was subjected to silica gel chromatography to obtain 0.26 g of 4-bromo-N-[4-chloro-2-(N,N′-dimethylhydrazinocarbonyl)-6-methylphenyl]-1-(3-chloro-2-pyridinyl)-1H-pyrrole-2-carboxamide of the formula: the mixture was extracted with ethyl acetate three times dried over anhydrous sodium sulfate concentrated under reduced pressure

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a mixture of 0.29 g of N,N′-dimethylhydrazine dihydrochloride, 1 ml of water, 0.31 g of potassium carbonate and 10 ml of N,N-dimethylformamide was added 1.0 g of 2-[4-bromo-1-(3-chloro-2-pyridinyl)-1H-pyrrol-2-yl]-6-chloro-8-methyl-4H-3,1-benzoxazine-4-one. The resulting mixture was stirred at room temperature for 6 hours. Water was poured into the reaction mixture, and the mixture was extracted with ethyl acetate three times. The organic layers were combined, dried over anhydrous sodium sulfate, and concentrated under reduced pressure. The resulting residue was subjected to silica gel chromatography to obtain 0.26 g of 4-bromo-N-[4-chloro-2-(N,N′-dimethylhydrazinocarbonyl)-6-methylphenyl]-1-(3-chloro-2-pyridinyl)-1H-pyrrole-2-carboxamide of the formula: the mixture was extracted with ethyl acetate three times dried over anhydrous sodium sulfate concentrated under reduced pressure

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a mixture of 0.13 g of N,N′-dimethylhydrazine dihydrochloride, 1 ml of water, 0.14 g of potassium carbonate and 10 ml of tetrahydrofuran was added 0.23 g of 2-[3-bromo-1-(3-chloro-2-pyridinyl)-1H-pyrazol-5-yl]-6-chloro-8-methyl-4H-3,1-benzoxazine-4-one, and the resulting mixture was stirred at room temperature for 3 hours. The reaction mixture was poured into 30 ml of water, and the mixture was extracted with ethyl acetate three times. The organic layers were combined, dried over anhydrous sodium sulfate, and concentrated under reduced pressure. The residue was washed with ethyl acetate to obtain 0.35 g of 3-bromo-N-[4-chloro-2-(N,N′-dimethylhydrazinocarbonyl)-6-methylphenyl]-1-(3-chloro-2-pyridinyl)-1H-pyrazole-5-carboxamide of the formula: the mixture was extracted with ethyl acetate three times dried over anhydrous sodium sulfate concentrated under reduced pressure The residue was washed with ethyl acetate

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a mixture of 0.13 g of N,N′-dimethylhydrazine dihydrochloride, 1 ml of water, 0.14 g of potassium carbonate and 10 ml of tetrahydrofuran was added 0.23 g of 2-[3-bromo-1-(3-chloro-2-pyridinyl)-1H-pyrazol-5-yl]-6-chloro-8-methyl-4H-3,1-benzoxazine-4-one, and the resulting mixture was stirred at room temperature for 3 hours. The reaction mixture was poured into 30 ml of water, and the mixture was extracted with ethyl acetate three times. The organic layers were combined, dried over anhydrous sodium sulfate, and concentrated under reduced pressure. The residue was washed with ethyl acetate to obtain 0.35 g of 3-bromo-N-[4-chloro-2-(N,N′-dimethylhydrazinocarbonyl)-6-methylphenyl]-1-(3-chloro-2-pyridinyl)-1H-pyrazole-5-carboxamide of the formula: the mixture was extracted with ethyl acetate three times dried over anhydrous sodium sulfate concentrated under reduced pressure The residue was washed with ethyl acetate

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a mixture of 0.26 g of N,N′-dimethylhydrazine dihydrochloride, 2 ml of water, 0.5 g of potassium carbonate and 10 ml of N,N-dimethylformamide was added 0.20 g of 2-[3-bromo-1-(3-chloro-2-pyridinyl)-1H-pyrazol-5-yl]-8-methyl-6-nitro-4H-3,1-benzoxazine-4-one. The resulting mixture was stirred at room temperature for 2 hours. The reaction mixture was poured into water, and extracted with ethyl acetate three times. The organic layers were combined, washed successively with water and an aqueous saturated sodium chloride solution, dried over anhydrous sodium sulfate, and concentrated under reduced pressure to obtain 3-bromo-1-(3-chloro-2-pyridinyl)-N-[2-(N,N′-dimethylhydrazinocarbonyl)-6-methyl-4-nitrophenyl]-1H-pyrazole-5-carboxamide of the formula: extracted with ethyl acetate three times washed successively with water an aqueous saturated sodium chloride solution, dried over anhydrous sodium sulfate concentrated under reduced pressure

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a mixture of 0.26 g of N,N′-dimethylhydrazine dihydrochloride, 2 ml of water, 0.5 g of potassium carbonate and 10 ml of N,N-dimethylformamide was added 0.20 g of 2-[3-bromo-1-(3-chloro-2-pyridinyl)-1H-pyrazol-5-yl]-8-methyl-6-nitro-4H-3,1-benzoxazine-4-one. The resulting mixture was stirred at room temperature for 2 hours. The reaction mixture was poured into water, and extracted with ethyl acetate three times. The organic layers were combined, washed successively with water and an aqueous saturated sodium chloride solution, dried over anhydrous sodium sulfate, and concentrated under reduced pressure to obtain 3-bromo-1-(3-chloro-2-pyridinyl)-N-[2-(N,N′-dimethylhydrazinocarbonyl)-6-methyl-4-nitrophenyl]-1H-pyrazole-5-carboxamide of the formula: extracted with ethyl acetate three times washed successively with water an aqueous saturated sodium chloride solution, dried over anhydrous sodium sulfate concentrated under reduced pressure

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 1,2-Dimethylhydrazine dihydrochloride (2.6 g, 0.02 mol) was suspended in ice-cold dry pyridine (6 ml) and the mixture was stirred for 10 minutes. Methanesulfonyl chloride (5.0 g, 0.043 mol) was added in portions to this mixture, while maintaining the temperature between 0° and 10° C. After an additional 1 hour of stirring at 0° to 5° C., the reaction mixture was left in a freezer (-10° C.) overnight. The pH of the reaction mixture was adjusted to pH 1 with cold dilute hydrochloric acid. The solid that separated was filtered and recrystallized from ethanol (Norit A) to give 1.4 g (32%) of the title compound: m.p. 168°-169° C.; anal. (C4H12N2O4S2) C,H,N; 1H NMR (CDCl3) δ 3.1 [2s, 12H, 2(CH3SO2NCH3)]. while maintaining the temperature between 0° and 10° C After an additional 1 hour of stirring at 0° to 5° C. the reaction mixture was left in a freezer (-10° C.) overnight The solid that separated was filtered recrystallized from ethanol (Norit A)