反应详情

To a solution of 2-(1-methyl-1-{[2-(trimethylsilyl)ethoxy]methoxy}ethyl)thiazole from Step 2 in chloroform (2 mL mmol) at room temperature was added bromine (2 molar eq) and the resulting mixture was stirred for 1 hour. Solid sodium bicarbonate (0.55 eq) was added and the mixture was stirred for 5 hours. More sodium bicarbonate was added (0.55 eq) and stirring was continued for 18 hours. After a final addition of sodium bicarbonate (0.55 eq) the mixture was stirred for a further 5 hours, diluted with chloroform and the organic phase was washed with saturated aqueous sodium bicarbonate, then with water, dried and evaporated. The crude material was chromatographed, eluting with a 3:7 mixture of ethyl acetate and hexane to afford the desired product.

1. stirringthe mixture was stirred for 5 hours
2. stirringstirring
3. waitwas continued for 18 hours
4. stirringwas stirred for a further 5 hours
5. washthe organic phase was washed with saturated aqueous sodium bicarbonate
6. dry with materialwith water, dried
7. customevaporated
8. customThe crude material was chromatographed
9. washeluting with a 3:7 mixture of ethyl acetate and hexane