Total synthesis of (−)-diospongin A and (+)-cryptofolione via asymmetric aldol reaction
作者:Rayala Naveen Kumar、H.M. Meshram
DOI:10.1016/j.tetlet.2010.12.070
日期:2011.3
Stereoselective synthesis of two distinctive pyranone skeletons diospongin A and cryptofolione has been described based on an asymmetric aldol reaction starting from Chan’s diene. The synthetic strategy involves the enantioselective Mukaiyama aldol, diastereoselective reduction of δ-hydroxy-β-keto ester, a tandem sequence of deprotection, and intramolecular oxa-Michael reaction to obtain diospongin
基于从Chan's二烯开始的不对称醛醇缩合反应,已经描述了两个独特的吡喃酮骨架双皂甙A和隐叶酮的立体选择性合成。合成策略包括对映选择性Mukaiyama羟醛,非对映选择性还原δ-羟基-β-酮酸酯,一连串的脱保护序列以及分子内的oxa-Michael反应以获得双桥皂苷A以及使用闭环易位反应形成不对称的烯丙基化和内酯形成获得隐氟利酮。