An Efficient Sequential Reaction Process to Polysubstituted Indolizidines and Quinolizidines and Its Application to the Total Synthesis of Indolizidine 223A
作者:Wei Zhu、Dapeng Dong、Xiaotao Pu、Dawei Ma
DOI:10.1021/ol047476y
日期:2005.2.1
The reaction of iodides 1 with delta-chloropropylamines 5 in MeCN assisted with K2CO3 undergoes a sequential S(N)2/Michael addition/SN2/SN2 reactionprocess to give polysubstituted indolizidines and quinolizidines. Using this method, indolizidine 223A is synthesized from 2-ethyl-2-hexenoic acid in 12 linear steps and 14.5% overall yield. [Reaction: see text]
A sequential reaction process to assemble polysubstituted indolizidines, quinolizidines and quinolizidine analogues
作者:Guorong Cai、Wei Zhu、Dawei Ma
DOI:10.1016/j.tet.2006.03.068
日期:2006.6
The omega-iodo-alpha,beta-alkynoates and their ketone, sulfone or phosphonate analogues react with delta-chloropropylamines in MeCN assisted with K2CO3 to undergo a sequential S(N)2/Michael addition/S(N)2/S(N)2 reaction process, giving polysubstituted indolizidines or quinolizidines in good to excellent yields. This sequential reaction process is also compatible with three other substituted alpha,beta-alkynoates, affording quinolizidine analogues in moderate to good yields. (c) 2006 Elsevier Ltd. All rights reserved.
Preparation and reductive transformations of vinylogous sulfonamides (β-sulfonyl enamines), and application to the synthesis of indolizidines
作者:Joseph P. Michael、Charles B. de Koning、Tshepo J. Malefetse、Ibrahim Yillah
DOI:10.1039/b413379j
日期:——
Condensation between the methiodide salts of 1-alkylpyrrolidine-2-thiones and ethyl [(4-methylphenyl)sulfonyl]acetate or 1-[(4-methylphenyl)sulfonyl]propan-2-one afforded several 2-[[(4-methylphenyl)sulfonyl]methylene]pyrrolidines in good yield. These beta-sulfonyl enamines are sufficiently nucleophilic for cyclisation with internal electrophiles to give sulfone-substituted indolizines, potentially