Stereoselective Synthesis of New Conformationally Restricted Analogues of a Potent CGRP Receptor Antagonist
摘要:
A stereocontrolled racemic synthesis of conformationally restricted analogues 2a and 2b of a potent CGRP receptor antagonist 1 by novel functionalization of 2-substituted octahydropyrido[1,2-a]pyrazin-6-ones is described. The new diastereoselective LDA-promoted α-nitration of intermediate lactams established the required trans-configuration in the desired products.
Stereoselective Synthesis of New Conformationally Restricted Analogues of a Potent CGRP Receptor Antagonist
摘要:
A stereocontrolled racemic synthesis of conformationally restricted analogues 2a and 2b of a potent CGRP receptor antagonist 1 by novel functionalization of 2-substituted octahydropyrido[1,2-a]pyrazin-6-ones is described. The new diastereoselective LDA-promoted α-nitration of intermediate lactams established the required trans-configuration in the desired products.
Total Synthesis of Microtubule-Stabilizing Agent Ceratamine A
作者:Qiguo Feng、Lulu Tao、Zhanzhu Liu
DOI:10.1021/jo402165n
日期:2013.12.20
The totalsynthesis of ceratamine A, a natural microtubule-stabilizing agent with unusual cellular effects, has been accomplished starting from 5-methoxybenzimidazole in 10 steps in an overall yield of 12.7%. The key steps in the synthesis involved the Schmidt rearrangement to construct the azepine ring, the alkylation of lactam to introduce the C-5 benzylic side chain, and the highly economical SNAr
ceratamine A(一种天然的微管稳定剂,具有非凡的细胞作用)的总合成已从10个步骤的5-甲氧基苯并咪唑开始,以12.7%的总收率完成。合成中的关键步骤包括施密特重排以构建氮杂环戊烷环,内酰胺的烷基化以引入C-5苄基侧链,以及非常经济的S N Ar反应以安装C-2甲胺残基。
OKAMOTO, KELVIN T.;CLARDY, JON, TETRAHEDRON LETT., 28,(1987) N 42, 4969-4972