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
描述了向溴化他汀的C 20氧化系列的下半部分的合成过程。使用mCPBA,通过羟基定向的环氧化作用,在C 20位形成立体异构中心。已经发现,银(I)盐是通过氧离子中间体将α-溴环氧化物区域选择性环裂解为相应的α-羟基酮的有效且温和的试剂。