A facile 1, 5-migration of tert-butyldimethylsilyl and tert-butyldiphenylsilyl groups in the Witting reaction and under other basic conditions was observed during synthetic studies on prostaglandins. A new method for the cleavage of these two silyl protecting groups to the parent alcohol was developed by the combined use of potassium superoxide and crown ether in dimethyl sulfoxide. Utilizing these new reactivities, an efficient synthesis of 11-epi-PGF2α from the well known Corey lactone was successfully achieved.
在
前列腺素的合成研究中,观察到了在Witting反应及其他碱性条件下,叔丁基二甲基
硅基和叔丁基二苯基
硅基团的容易1,5迁移。通过在
二甲基亚砜中联合使用过氧化
钾和
冠醚,开发了一种新的方法来裂解这两种
硅保护基团,生成母酒。利用这些新的反应性,成功实现了从著名的Corey内酯高效合成11-epi-
PGF2α。