反应详情

To a suspension of cytosine (5.0 grams, 43 mmoles) in a mixture of 1:4 pyridine:dichloromethane (50 ml), tert-butylbenzoyl chloride (Aldrich) (10.6 ml, 56.6 mmoles) was added dropwise. The reaction mixture was stirred at room temperature for four hours and thereafter water (10 ml) and chloroform (40 ml) were added thereto with vigorous stirring. The resulting precipitates were thereafter collected and washed with water. The organic layer in the filtered solution was separated, washed with 1M HCl (30 ml×2) and brine (30 ml) and dried, immediately thereafter, over anhydrous sodium sulfate. The solution was then evaporated to remove about ⅔ of its volume. To the remaining solution (about 20 ml), hexanes (50 ml) were added and the combined precipitates were dried over P2O5, under high vacuum, for eight hours. 11.2 grams (92% yield) of Compound 25 were obtained.

1. customThe resulting precipitates
2. customwere thereafter collected
3. washwashed with water
4. customThe organic layer in the filtered solution was separated
5. washwashed with 1M HCl (30 ml×2) and brine (30 ml)
6. customdried
7. customThe solution was then evaporated
8. customto remove about ⅔ of its volume
9. additionTo the remaining solution (about 20 ml), hexanes (50 ml) were added
10. customthe combined precipitates
11. dry with materialwere dried over P2O5, under high vacuum, for eight hours