Water → tert-Butyl-(1S,3R)-3-(6-tosyl-6H-pyrrolo[2,3-e][1, 2, 4]triazolo[4,3-a]pyrazin-1-yl)cyclopentylcarbamate

Participants

Reaction Conditions

Reaction Steps

To a solution of tert-butyl (1S,3R)-3-(2-(5-tosyl-5H-pyrrolo[2,3-b]pyrazin-2-yl)hydrazinecarbonyl)cyclopentylcarbamate (9.30 g, 18.1 mmol) in 1,4-dioxane (100 mL) was added TEA (10.0 mL, 72.3 mmol) and SOCl2 (2.11 mL, 28.9 mmol). The mixture was heated at about 80° C. for about 1.5 h. The reaction mixture was cooled to ambient temperature, EtOAc and water were added, and the layers were separated. The aqueous solution was extracted with EtOAc (2×100 mL) and the combined organic layers were washed with saturated aqueous NaHCO3 and brine (100 mL each). The organic extracts were dried over anhydrous Na2SO4, filtered, and concentrated under reduced pressure. The crude material was purified by silica gel chromatography eluting with a gradient of 25-100% EtOAc in DCM to give tert-butyl-(1S,3R)-3-(6-tosyl-6H-pyrrolo[2,3-e][1,2,4]triazolo[4,3-a]pyrazin-1-yl)cyclopentylcarbamate (7.65 g, 85%): LC/MS (Table 2, Method a) Rt=2.37 min; MS m/z: 497 (M+H)+.

Provenance & Evidence