The stereocontrolled total synthesis of altohyrtin A/spongistatin 1: the southern hemisphere EF segment
作者:Ian Paterson、Mark J. Coster、David Y.-K. Chen、José L. Aceña、Jordi Bach、Linda E. Keown、Thomas Trieselmann
DOI:10.1039/b504149j
日期:——
The fully functionalised C29-C51 southern hemisphere of altohyrtin A/spongistatin1 , incorporating the E- and F-ring tetrahydropyran rings and the unsaturated side chain, has been synthesised in a highly convergent and stereocontrolled manner. Key steps in the synthesis of this phosphonium salt include four highly diastereoselective, substrate-controlled, boron aldol reactions to establish key C-C
高度融合和立体控制的方式合成了功能完备的altohyrtin A /海绵抑素1的C29-C51南半球,其中包含E和F环四氢吡喃环和不饱和侧链。合成该salt盐的关键步骤包括四个高度非对映选择性,受底物控制的硼醇醛缩醛反应,以建立关键的CC键和相应的立体中心,其中通过利用远程异构体实现引入氯二烯侧链和带有C47羟基的中心。 F环四氢吡喃的立体诱导。
Synthesis of spongistatin 2 employing a new route to the EF fragment
An improved route to the EF fragment of the spongistatins has been developed and employed in a synthesis of spongistatin2. The C48–C51 diene side chain, which lacks the chlorine substituent present in spongistatin 1, presented some compatibility issues during target assembly. These were overcome by implementing a late stage Stille cross coupling to construct the diene portion of the natural product