Multi-Step Application of Immobilized Reagents and Scavengers: A Total Synthesis of Epothilone C
作者:R. Ian Storer、Toshiyasu Takemoto、Philip S. Jackson、Dearg S. Brown、Ian R. Baxendale、Steven V. Ley
DOI:10.1002/chem.200305669
日期:2004.5.17
The totalsynthesis of the cytotoxic antitumour natural product epothilone C has provided a stage for the exploitation and further development of immobilized reagent methods. A stereoselective convergent synthetic strategy was applied, incorporating polymer-supported reagents, catalysts, scavengers and catch-and-release techniques to avoid frequent aqueous work-up and chromatographic purification.
A Novel Application of a Pd(0)-Catalyzed Nucleophilic Substitution Reaction to the Regio- and Stereoselective Synthesis of Lactam Analogues of the Epothilone Natural Products
作者:Robert M. Borzilleri、Xiaoping Zheng、Robert J. Schmidt、James A. Johnson、Soong-Hoon Kim、John D. DiMarco、Craig R. Fairchild、Jack Z. Gougoutas、Francis Y. F. Lee、Byron H. Long、Gregory D. Vite
DOI:10.1021/ja001899n
日期:2000.9.1
Several lactam analogues of the epothilones were prepared using a concise semisyntheticapproach starting with the unprotected natural products. Highlighted in this strategy is a novel regio- and stereoselective Pd(0)-catalyzed azidation reaction of a macrocyclic lactone. Subsequent reduction and macrolactamization of the resulting azide acid intermediates provided the desired macrolactams in satisfactory
从未受保护的天然产物开始,使用简洁的半合成方法制备了埃坡霉素的几种内酰胺类似物。该策略中的重点是大环内酯的新型区域选择性和立体选择性 Pd(0) 催化叠氮化反应。所得叠氮酸中间体的随后还原和大环内酰胺化以令人满意的总产率提供了所需的大环内酰胺。整个三步序列被简化为埃坡霉素 B-内酰胺 BMS-247550 的“一锅”工艺,目前正在进行 I 期临床试验。完成了制备埃坡霉素 C 的内酰胺类似物的初始全合成路线,并与更直接的半合成方法进行了比较。所有内酰胺类似物都在体外进行了评估,并讨论了结果。
Stereoselective Syntheses of Epothilones A and B via Nitrile Oxide Cycloadditions and Related Studies
作者:Jeffrey W. Bode、Erick M. Carreira
DOI:10.1021/jo015791h
日期:2001.9.1
epothilones A and B are described. The routes described make extensive study of nitrileoxide cycloadditions as surrogates for aldoladdition reactions and have led to the realization of a highly convergent synthesis based on the Kanemasa hydroxyl-directed nitrileoxide cycloaddition. As well, our synthetic efforts have led to the development of new reaction methodologies and served as the proving ground for
Stereochemical elucidation of the 1,4 polyketide amphidinoketide I
作者:Louise M Walsh、Jonathan M Goodman
DOI:10.1039/b309104j
日期:——
The relative and absolute stereochemistry of amphidinoketide I has been determined by the total synthesis of all the diastereoisomers. Molecular modelling suggests that the natural product is not the thermodynamically preferred diastereoisomer.
Synthesis of the C7-C17 Segment of Epothilones by a 10-membered Ring Closing Metathesis Reaction
作者:Kai Gerlach、Monika Quitschalle、Markus Kalesse
DOI:10.1055/s-1998-1870
日期:1998.10
The synthesis of the C7-C17 segment of epothilones employing a ring closing metathesis is described. Our approach utilizes the stereoselective methylation of the 10-membered lactone, generated by ring closing metathesis, for introducing the methyl group at C8 and provides an efficient access to strained epothilone derivatives, as well as to the C7-C17 segment of epothilones.