ethyl 3-chlorosulfonylpropanoate

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

Procedure: To 200 mg (0.512 mmol) tert-butyl 3-amino-5-(3,5-dicyano-2,6-dimethyl-1,4-dihydropyridin-4-yl)-1H-indazole-1-carboxylate (Example 3A) in dichloromethane (4 ml) were added 309 mg (1.54 mmol) ethyl 3-(chlorosulfonyl)propanoate and 0.21 ml (1.54 mmol) triethylamine. The mixture was stirred at room temperature for 12 h and then concentrated under reduced pressure. The residue was dissolved in ethyl acetate, and the solution was washed with saturated aqueous sodium hydrogencarbonate solution, dried over sodium sulfate, filtered, and concentrated under reduced pressure. The crude product was purified by preparative RP-HPLC (acetonitrile/water gradient) to yield 41 mg (14% of th.) of the title compound. concentrated under reduced pressure The residue was dissolved in ethyl acetate the solution was washed with saturated aqueous sodium hydrogencarbonate solution dried over sodium sulfate filtered concentrated under reduced pressure The crude product was purified by preparative RP-HPLC (acetonitrile/water gradient)

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

Procedure: To 200 mg (0.512 mmol) tert-butyl 3-amino-5-(3,5-dicyano-2,6-dimethyl-1,4-dihydropyridin-4-yl)-1H-indazole-1-carboxylate (Example 3A) in dichloromethane (4 ml) were added 309 mg (1.54 mmol) ethyl 3-(chlorosulfonyl)propanoate and 0.21 ml (1.54 mmol) triethylamine. The mixture was stirred at room temperature for 12 h and then concentrated under reduced pressure. The residue was dissolved in ethyl acetate, and the solution was washed with saturated aqueous sodium hydrogencarbonate solution, dried over sodium sulfate, filtered, and concentrated under reduced pressure. The crude product was purified by preparative RP-HPLC (acetonitrile/water gradient) to yield 41 mg (14% of th.) of the title compound. concentrated under reduced pressure The residue was dissolved in ethyl acetate the solution was washed with saturated aqueous sodium hydrogencarbonate solution dried over sodium sulfate filtered concentrated under reduced pressure The crude product was purified by preparative RP-HPLC (acetonitrile/water gradient)

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

Procedure: To a stirred mixture of 90.5 g (0.44 moles) sodium 2-carboethoxyethyl sulfonate (the product of Example 26) in 300 ml chloroform, 92 g (0.44 moles) phosphorus pentachloride was added in small portions, maintaining the temperature of the reaction mixture below 40° C. during the addition. The reaction mixture was refluxed for about 6 hours, and then filtered. Nitrogen was bubbled through the solution to remove excess hydrogen chloride gas. Stripping of the solvent gave 28.4 g of the above-identified product. maintaining the temperature of the reaction mixture below 40° C. during the addition The reaction mixture was refluxed for about 6 hours filtered Nitrogen was bubbled through the solution to remove excess hydrogen chloride gas

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

Procedure: To 200 mg (0.512 mmol) tert-butyl 3-amino-5-(3,5-dicyano-2,6-dimethyl-1,4-dihydropyridin-4-yl)-1H-indazole-1-carboxylate (Example 3A) in dichloromethane (4 ml) were added 309 mg (1.54 mmol) ethyl 3-(chlorosulfonyl)propanoate and 0.21 ml (1.54 mmol) triethylamine. The mixture was stirred at room temperature for 12 h and then concentrated under reduced pressure. The residue was dissolved in ethyl acetate, and the solution was washed with saturated aqueous sodium hydrogencarbonate solution, dried over sodium sulfate, filtered, and concentrated under reduced pressure. The crude product was purified by preparative RP-HPLC (acetonitrile/water gradient) to yield 41 mg (14% of th.) of the title compound. concentrated under reduced pressure The residue was dissolved in ethyl acetate the solution was washed with saturated aqueous sodium hydrogencarbonate solution dried over sodium sulfate filtered concentrated under reduced pressure The crude product was purified by preparative RP-HPLC (acetonitrile/water gradient)