一系列酰胺基乙缩醛与布朗斯台德超酸CF 3 SO 3 H反应,通过环化级联反应提供吲哚并咪唑衍生物。提出了一种机理,该机理涉及形成乙烯基的烯醇,该乙烯基的烯醇与相邻的N-酰基亚胺离子基团进行6π-电环化反应。在具有芳基取代基的情况下,N-酰基亚氨基鎓离子基团具有与芳基基团一起进行Friedel-Crafts型环化的强烈趋势。合成方法用于制备生物碱天然产物ipalbidine。
Synthetic Applications of Sulfur-Substituted Indolizidines and Quinolizidines
摘要:
Starting from the sulfur-substituted indolizidines and quinolizidines, a few useful synthetic transformations have been developed and the synthesis of some natural products including indolizidine 209D, epimyrtine, lasubine II, 8a-epi-dendroprimine, and 5-epi-cermizine C has been accomplished.
New synthesis and reactions of indolizidine 167E and indolizidine derivatives
作者:Shang-Shing P. Chou、Shan-Lun Chiang、Guan-Lin Huang、Bi-Shan Chiang、Ya-Chien Yu
DOI:10.1016/j.tet.2012.10.026
日期:2013.1
Two new methods of synthesizing indolizidines via ring-closing metathesis (RCM) have been developed. One method utilizes an alkene-isomerization, and the other method uses N-vinylation of an amide as the key step. Indolizidine 167E and many derivatives have also been synthesized. (C) 2012 Elsevier Ltd. All rights reserved.