Synthetic studies on bryostatins, potent antineoplastic agents: Synthesis of the C17C27 fragment of C20 oxygenated bryostatins
作者:Ken Ohmori、Shigeru Nishiyama、Shosuke Yamamura
DOI:10.1016/0040-4039(95)01310-e
日期:1995.9
Synthetic process towards the bottom half portion of C20 oxygenated series of bryostatins is described. The stereogenic center at C20 position was constructed through a hydroxyl group-directed epoxidation by using mCPBA. It was found that silver (I) salt is an effective and mild reagent for regioselective ring cleavage of α-bromoepoxides into the corresponding α-hydroxyketones via oxonium ion intermediates