反应详情

A solution of boron tribromide (25.0 ml, 61.5 g, 0.25 mol) in dry dichloromethane (140 ml) was added dropwise to a stirred, cooled (-78° C.) solution of compound 8 (12.22 g, 0.05 mol) in dry dichloromethane (250 ml) under dry nitrogen. The stirred mixture was allowed to warm to room temperature over 9 h (i.e., until glc analysis revealed absence of starting material). The mixture was cooled to -10° C., water was added slowly (exothermic) and cooled to 2° C. The product was filtered off, washed with water and dried (CaCl2) in vacuo to give a pale-yellow powder.

1. temperatureThe mixture was cooled to -10° C.
2. temperaturecooled to 2° C
3. filtrationThe product was filtered off
4. washwashed with water
5. dry with materialdried (CaCl2) in vacuo
6. customto give a pale-yellow powder