反应详情

A solution of ethyl 1,4,4-trimethyl-7-oxo-4,5,6,7-tetrahydro-1H-indazole-3-carboxylate (4.8 g, 19.18 mmol) in anhydrous dimethylformamide (30 mL) was treated with dimethylformamide di-tert-butylacetal (9.19 mL, 38.35 mmol) at 65° C. for 2 hours. The mixture was evaporated to dryness and the crude material was crystallized from hexane to give the title compound (5.1 g, 87% yield).

1. customThe mixture was evaporated to dryness
2. customthe crude material was crystallized from hexane