反应详情

0.82 g (3.8 mmol) of 7,8-dihydro-6,6-dimethyl-7,8-epoxy-6H-pyrano[2,3-f]benzo-2,1,3-oxadiazole were dissolved in 25 ml of 16.7% NH3 -EtOH and reacted for at 60° C. for 48 hours in a pressure glass tube. The solvent was distilled off, and the residue was subjected to silica gel column chromatography (eluent: ethyl acetate-methanol=5:1) to obtain 0.77 g of the intended compound as a brown solid. (yield: 87%) A part of the product was recrystallized from ethanol to obtain pure colorless crystals of the intended compound.

1. customreacted for at 60° C. for 48 hours in a pressure glass tube
2. distillationThe solvent was distilled off