反应详情

To a solution of (S)-tert-butyl 1-(tert-butyldimethylsilyloxy)-3-cyclopropylbut-3-en-2-ylcarbamate (Intermediate 233, 6.77 g, 19.82 mmol) in DCM (100 mL) at room temperature was added zinc bromide (17.86 g, 79.28 mmol). The reaction mixture was stirred overnight at room temperature. Another 1 eq of zinc bromide was added. After several hours the reaction mixture was filtered and washed with saturated sodium bicarbonate. The resulting emulsion was filtered through a nylon filter and the layers were separated. The organics were dried over magnesium sulfate, filtered and concentrated to afford the title compound as a yellow oil (4.61 g, 96%).

1. filtrationAfter several hours the reaction mixture was filtered
2. washwashed with saturated sodium bicarbonate
3. filtrationThe resulting emulsion was filtered through a nylon
4. filtrationfilter
5. customthe layers were separated
6. dry with materialThe organics were dried over magnesium sulfate
7. filtrationfiltered
8. concentrationconcentrated