A Unified Strategy for the Asymmetric Total Syntheses of Diversonol and Lachnone C
作者:Manuel C. Bröhmer、Emmanuel Bourcet、Martin Nieger、Stefan Bräse
DOI:10.1002/chem.201102192
日期:2011.12.2
A unified synthetic strategy for the asymmetric syntheses of the natural products diversonol and lachnone C was developed by using the domino vinylogous aldol–oxa‐Michael reaction as the enantioselective key step. Further transformations include dihydroxylation, lactol‐opening by a Wittig‐reaction, and lactonization. The obtained chromone lactones, a class of mycotoxins, can further be converted to
通过使用多米诺乙烯醇醛醛-氧杂-迈克尔反应作为对映选择性关键步骤,开发了天然产物曲松酚和lachnone C不对称合成的统一合成策略。进一步的转化包括二羟基化,通过维蒂希反应(Wittig-reaction)引起的内酯开放和内酯化。所获得的色酮内酯,一种霉菌毒素,可以通过狄克曼缩合进一步转化为四氢氧杂蒽酮。该通用方法首次允许对映选择性地获得这些类别的天然产物,并且应适用于四氢黄酮和色酮内酯家族的其他成员。