反应详情

To a solution of calcium hypochlorite (29.4 g, 137.8 mmol) in water:acetic acid (125:9.5) was added a solution of 8-difluoromethoxychroman-4-one (7.4 g, 34.6 mmol, see step (iv) above) in acetonitrile (20 mL), whereafter the reaction mixture was stirred overnight. The mixture was diluted with water and extracted with ether (3×) and with EtOAc (1×). The combined organic layers were washed with water (3×), dried (Na2SO4) and evaporated, yielding 8.0 g (93%) of the sub-title compound.

1. extractionextracted with ether (3×) and with EtOAc (1×)
2. washThe combined organic layers were washed with water (3×)
3. dry with materialdried (Na2SO4)
4. customevaporated