Triethylamine → N-(6-(5-cyanopyrazin-2-ylamino)-4-(1-Boc-piperidin-4-ylmethylamino)pyridin-3-yl)ethanesulfonamide

Participants

Reaction Steps

Triethylamine (15 μL, 0.11 mmol) and ethylsulfonylchloride (8 μL, 0.78 mmol) were added to a stirred solution of tert-butyl 4-((5-amino-2-(5-cyanopyrazin-2-ylamino)-pyridin-4-ylamino)-methyl)-piperidine-1-carboxylate (30.3 mg, 0.071 mmol) in DMF (1 mL) at 0° C. After 1.5 hours at room temperature, further ethylsulfonylchloride (5.5 μL, 0.53 mmol) and triethylamine (7.5 μL, 0.53 mmol) were added. After 1 hour the reaction mixture was partitioned between dichloromethane and water. The aqueous phase was extracted with dichloromethane. The combined organic phases were dried (Na2SO4) and concentrated. Preparative HPLC gave N-(6-(5-cyanopyrazin-2-ylamino)-4-(1-Boc-piperidin-4-ylmethylamino)pyridin-3-yl)ethanesulfonamide as a solid. The material was dissolved in 20% trifluoroacetic acid in dichloromethane. After 20 minutes the mixture was loaded onto a MP-TsOH SPE cartridge and eluted with 2M ammonia in methanol. The basic fractions were combined to give N-(6-(5-cyanopyrazin-2-ylamino)-4-(piperidin-4-ylmethylamino)pyridin-3-yl)ethanesulfonamide (2.28 mg, 8%).

Provenance & Evidence