反应详情

1.845 g of anhydrous potassium carbonate is introduced into a solution of 11.716 g of the silyl ether produced in Example 1 in 122 ml of absolute MeOH, and the mixture is agitated under argon for 3 hours. The reaction solution is then cooled in an ice bath and gently combined dropwise with 1.86 ml of concentrated hydrochloric acid. Excess methanol is extensively concentrated under vacuum at room temperature, the residue is combined with 300 ml of methylene chloride, and the solution is dried over magnesium sulfate, filtered off, and concentrated. The oily residue is made to crystallize by trituration with hexane, thus obtaining 6.562 g of the title compound, mp 60.7° C.

1. temperatureThe reaction solution is then cooled in an ice bath
2. concentrationExcess methanol is extensively concentrated under vacuum at room temperature
3. dry with materialthe solution is dried over magnesium sulfate
4. filtrationfiltered off
5. concentrationconcentrated
6. customto crystallize by trituration with hexane