Iodotrimethylsilane-Promoted 1,4-Addition of Copper Acetylides to α,β-Unsaturated Ketones and Aldehydes
作者:Magnus Eriksson、Tommy Iliefski、Martin Nilsson、Thomas Olsson
DOI:10.1021/jo960393d
日期:1997.1.1
enones present as s-trans conformers to provide good yields of the silyl enol ethers of beta-acetylido carbonyl compounds. Typically good substrates are 2-cyclopentenone, 2-cyclohexenone, alpha,beta-unsaturated aldehydes, and beta-alkoxy-alpha-enones. Copper acetylide reagents prepared from CuI and an alkynyllithium give considerably higher yields than those prepared from CuBr or CuCN. Iodotrimethylsilane
在四氢呋喃中存在碘代三甲基硅烷(TMSI)和碘化锂的情况下,原本没有反应的乙炔化铜会加成以s-反式构象形式存在的烯酮,以提供高产率的β-乙酰基羰基化合物的甲硅烷基烯醇醚。通常,好的底物是2-环戊烯酮,2-环己烯酮,α,β-不饱和醛和β-烷氧基-α-烯酮。由CuI和炔基锂制得的乙炔铜试剂比由CuBr或CuCN制得的乙炔铜试剂的产率高得多。碘代三甲基硅烷是迄今为止最有效的硅烷,尽管在某些情况下三氟甲磺酸三甲基甲硅烷基是有用的。