反应详情

N-bromosuccinimide (12.5 g, 70.0 mmol) was added to a solution of acetonitrile (165 mL) containing 2,2,4,6,7-pentamethyl-2,3-dihydro-1-benzofuran (11.1 g, 58.3 mmol) synthesized in Reference Example 3 under ice-cooling condition, and the mixture was warmed to room temperature. After stirring for 5 hours, water was added to the reaction solution. The generated precipitate was collected by filtration and washed with a mixture of acetonitrile/water (1/2). The solid was dried to give 13.5 g of the title compound (yield: 86%).

1. customsynthesized in Reference Example 3 under ice-
2. temperaturecooling condition
3. filtrationThe generated precipitate was collected by filtration
4. washwashed with a mixture of acetonitrile/water (1/2)
5. customThe solid was dried