“contra-Michael” Addition of Alkyllithiums to Silicon- and Phenyl-substituted α,β-Unsaturated Amides in the Presence of<i>t</i>-BuOK
作者:Tomoko Hinago、Nana Teshima、Satoko Kenmoku、Tiyako Kamata、Nahoko Terauchi、Nao Chiba、Chikako Satoh、Aya Nakamura、Morio Asaoka
DOI:10.1246/cl.2007.54
日期:2007.1
Carbolithiation of 3-(trimethylsilyl)acrylamide and cinnamamide derivatives gave the corresponding 3-substituted (Michael) and/or 2-substituted (contra-Michael) adducts. The regioselectivity depends on the nature of alkyllithium reagents. In the carbolithiation with n-alkyllithiums, the presence of t-BuOK caused dramatic change of the addition mode and the contra-Michael adducts were obtained exclusively.
3-(三甲基硅基)丙烯酰胺和肉桂酰胺衍生物的碳锂化反应产生了相应的3-取代物(迈克尔加成物)和/或2-取代物(反迈克尔加成物)。区域选择性依赖于烃锂试剂的性质。在与正烷基锂的碳锂化反应中,存在t-BuOK导致了加成模式的显著变化,反迈克尔加成物被独占性地获得。