Seleno‐Michael Reaction of Stable Functionalised Alkyl Selenols: A Versatile Tool for the Synthesis of Acyclic and Cyclic Unsymmetrical Alkyl and Vinyl Selenides
作者:Damiano Tanini、Simone Scarpelli、Elena Ermini、Antonella Capperucci
DOI:10.1002/adsc.201900168
日期:2019.5.14
be converted into the corresponding synthetically valuable seleno‐Michael adducts, demonstrating high selectivity and excellent functional group tolerance. Hydroxy‐ and mercapto‐substituted vinyl selenides were efficiently employed for the synthesis of functionalised 1,3‐oxaselenolanes, 1,3‐thiaselenolanes, and 1,4‐thiaselenanes through intramolecular oxa‐ and thia‐Michael additions. Furthermore, a NaH‐promoted
描述了稳定的功能化伯烷基硒醇在活化烯烃和炔烃中的Seleno-Michael加成反应。在Al 2 O 3存在下,β-羟基,β-氨基和β-巯基硒醇与贫电子的烯烃和炔烃反应平稳,从而以良好的收率得到相应的不对称官能化的二烷基和烷基乙烯基硒化物。在非常温和的条件下,各种硒醇和迈克尔受体都可以转化为相应的具有合成价值的硒-迈克尔加合物,显示出很高的选择性和出色的官能团耐受性。羟基和巯基取代的乙烯基硒化物被有效地用于通过分子内的氧杂和硫杂迈克尔加成反应合成官能化的1,3-氧杂硒酸,1,3-硫杂硒酸和1,4-硫杂硒酸。此外,NaH促进的内酯化作用可以从羟基-乙烯基硒化物合成各种取代的2-氧代-1,4-氧杂aselenanes。