The manganese-mediated regioselective chlorination of allenes in synthetic approaches towards the spongistatins and halomon natural products
摘要:
The first examples for the chlorination of allenes using manganese reagents generated from potassium permanganate and benzyl triethylammonium chloride in the presence of the chlorine donors oxalyl chloride or chlorotrimethylsilane are reported with the aim of developing useful synthetic routes to the spongistatin and halomon marine natural products. (C) 1998 Elsevier Science Ltd. All rights reserved.
作者:Steven V. Ley、Shigeru Kawahara、Matthew J. Gaunt、Alessandra Scolaro、Shigeo Yamanoi
DOI:10.1055/s-2005-871960
日期:——
The EF fragment of spongistatin 1 was prepared diastereoselectively from 3,4,5-tri-O-benzyl-D-glucal.
海绵抑素 1 的 EF 片段是从 3,4,5-tri-O-benzyl-D-glucal 非对映选择性制备的。
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。
In situ alcohol oxidation-Wittig reactions
作者:Xudong Wei、Richard J.K Taylor
DOI:10.1016/s0040-4039(98)00592-9
日期:1998.5
alcohols can be oxidised with activated manganese dioxide in the presence of stabilised Wittig reagents to generate α,β-unsaturated esters directly. This simple procedure, which can also be utilised with diols to give double homologation, is generally useful and particularly valuable if the intermediate aldehydes are difficult to isolate, toxic or prone to isomerisation.
Studies Towards the Synthesis of the C29-C51 Fragment of Altohyrtin A
作者:Eduardo Fernandez-Megia、Nelly Gourlaouen、Steven V. Ley、Gareth J. Rowlands
DOI:10.1055/s-1998-3140
日期:1998.9
The synthesis of the highly substituted E and F pyran fragment 23 of altohyrtin A 1 from tri-O-benzyl-d-glucal 5 is described. The synthesis of a model compound 31 containing the altohyrtin A triene side-chain outlines the proposed strategy for the elaboration of the F pyran.
本文介绍了从三-O-苄基-d-葡萄糖醛 5 中合成高度取代的阿尔托黄素 A 1 的 E 和 F 吡喃片段 23 的过程。含有阿托菌素 A 三烯侧链的模型化合物 31 的合成概述了拟议的 F 吡喃化合物的合成策略。
Total Synthesis of (+)-Spongistatin 1. An Effective Second-Generation Construction of an Advanced EF Wittig Salt, Fragment Union, and Final Elaboration
作者:Amos B. Smith、Wenyu Zhu、Shohei Shirakami、Chris Sfouggatakis、Victoria A. Doughty、Clay S. Bennett、Yasuharu Sakamoto
DOI:10.1021/ol034037a
日期:2003.3.1
A stereocontrolled, total synthesis of (+)-spongistatin 1 (1) has been achieved. Union of a second-generation EF Wittig salt (+)-3 with the advanced ABCD aldehyde (-)-4, followed by regioselective macrolactonization and global deprotection afforded (+)-spongistatin 1 (1). The longest linear sequence, 29 steps, proceeded in 0.5% overall yield.