Water → 4-(2,2-Difluorovinyl)-1-{[6-methoxy-2-(trifluoromethyl)imidazo[1,2-b]pyridazin-3-yl]methyl}pyrrolidin-2-one

Participants

Reaction Steps

A solution of {[6-chloro-2-(trifluoromethyl)imidazo[1,2-b]pyridazin-3-yl]methyl}-4-(2,2-difluoro-vinyl)-pyrrolidin-2-one 33 (500 mg, 1.31 mmol, 1 eq) and sodium methoxide (142 mg, 2.63 mmol, 2 eq) in methanol (5 ml) is heated in microwave apparatus (300 W, T 150° C.) until complete conversion (0.5 h). After cooling to room temperature, water (10 ml) is added and the methanol is removed under reduced pressure. Subsequent extraction with dichloromethane (2×20 ml), drying of cumulated organic layers over MgSO4, filtration and solvent evaporation under reduced pressure affords the crude reaction mixture which is recristallized in AcOEt/iPr2O to yield 0.46 g of 4-(2,2-difluorovinyl)-1-{[6-methoxy-2-(trifluoromethyl)imidazo[1,2-b]pyridazin-3-yl]methyl}pyrrolidin-2-one 42.

Provenance & Evidence