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 semisynthetic approach 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。