Enantioselective Synthesis of the Papulacandin Ring System: Conversion of the Mannose Diastereoisomer into a Glucose Stereoisomer
作者:Devan Balachari、George A. O'Doherty
DOI:10.1021/ol006662a
日期:2000.12.1
[structure] An enantioselective synthesis of three diastereoisomers of the C-arylglycoside tricyclic spiroketal nucleus of the papulacandins has been achieved, in which the initial asymmetry was introduced via a Sharpless dihydroxylation of substituted 5-aryl-2-vinylfurans. A selective oxidation-reduction sequence converted the mannose isomer into the glucose isomer. This sequence can conveniently
[结构]已经实现了对木瓜素的C-芳基糖苷三环螺环核的三个非对映异构体的对映选择性合成,其中最初的不对称性是通过取代的5-芳基-2-乙烯基呋喃的Sharpless二羟基化引入的。选择性氧化还原序列将甘露糖异构体转化为葡萄糖异构体。该序列可以方便地从3,5-二甲氧基苄基醇以仅10-14步产生papulacandin环系统以及其对映异构体和非对映异构体,总产率为5-8%。