Cyclopropanesulfonyl chloride → N-((1S,3R)-3-(6H-pyrrolo[2,3-e][1,2,4]triazolo[4,3-a]pyrazin-1-yl)cyclopentyl)cyclopropanesulfonamide

Participants

Reaction Steps

To a mixture of (1S,3R)-3-(6H-pyrrolo[2,3-e][1,2,4]triazolo[4,3-a]pyrazin-1-yl)cyclopentanamine hydrochloride (0.300 g, 0.952 mmol, Example #6, Step C) in DMF (9 mL) was added TEA (0.462 mL, 3.33 mmol) and cyclopropanesulfonyl chloride (0.097 mL, 0.95 mmol). After about 1.5 h at ambient temperature, the reaction was diluted with water (10 mL) and extracted with DCM (3×15 mL). The combined organic layers were washed with brine, dried over anhydrous Na2SO4, filtered, and concentrated under reduced pressure. To the crude material was added MeOH (˜50 mL) and a small amount of insoluble material (<0.01 g) was removed by filtration. Silica gel (2 g) was added to the filtrate and the mixture was concentrated under reduced pressure. The mixture was purified by silica gel chromatography eluting with a step-wise gradient of DCM/MeOH/NH4OH 990:9:1 to 980:18:2 to give an off-white solid that was dried in a vacuum oven at about 70° C. The solid was dissolved in hot MeOH, filtered while hot to remove particulates and then the filtrate was sonicated while cooling to provide a fine suspension which was concentrated under reduced pressure and dried in a vacuum oven at about 100° C. to give N-((1S,3R)-3-(6H-pyrrolo[2,3-e][1,2,4]triazolo[4,3-a]pyrazin-1-yl)cyclopentyl)cyclopropane-sulfonamide (0.21 g, 64%): LC/MS (Table 2, Method a) Rt=1.51 min; MS m/z: 347 (M+H)+.

Provenance & Evidence