Synthesis and Diels−Alder Reactions of 4-Vinylimidazoles
作者:Carl J. Lovely、Hongwang Du、H. V. Rasika Dias
DOI:10.1021/ol015687m
日期:2001.5.1
[GRAPHICS]The synthesis of several 4-vinylimidazoles via Stille cross-coupling reactions of the corresponding protected 4-iodoimidazoles with tributylvinylstannane is described, These heterocyclic dienes are shown to be effective partners in the Diels-Alder reaction, providing adducts in good yield acid exhibiting useful levels of isomer selectivity and stereoselectivity (endo/exo).
Preparation and Diels−Alder Chemistry of 4-Vinylimidazoles
作者:Carl J. Lovely、Hongwang Du、Rasapalli Sivappa、Manojkumar R. Bhandari、Yong He、H. V. Rasika Dias
DOI:10.1021/jo0626008
日期:2007.5.1
circumvented to a large extent by the choice of reaction conditions. Limited reactions were observed with other dienophiles, providing the expected cycloadducts in most cases, although an abnormal adduct was obtained in one case with dimethyl acetylene dicarboxylate. These substrates also participate in regioselective Diels−Alder reactions with monoactivated dienophiles, but require fairly forcing conditions