Regioselective allylic alkylation and etherification catalyzed by in situ generated N-heterocyclic carbene ruthenium complexes
作者:Nevin Gürbüz、Ismail Özdemir、Bekir Çetinkaya、Jean-Luc Renaud、Bernard Demerseman、Christian Bruneau
DOI:10.1016/j.tetlet.2005.11.051
日期:2006.1
chlorides by carbon nucleophiles and phenols, respectively. After generation of diaminocarbene species upon deprotonation by tBuOK, their association with [Cp*Ru(MeCN)3]PF6 induces a very high regioselectivity in favor of the branched isomers when cinnamyl derivatives are used as starting substrates. They also provide good regioselectivities for the allylation of phenols by unsymmetrical aliphatic allylic
卤代苯并咪唑鎓盐首次用作配体前体,分别被碳亲核试剂和苯酚钌催化的烯丙基碳酸盐和氯化物取代。在通过t BuOK去质子化后生成二氨基卡宾物质后,当使用肉桂基衍生物作为起始底物时,它们与[Cp * Ru(MeCN)3 ] PF 6的缔合引起非常高的区域选择性,有利于支链异构体。它们还为苯酚通过不对称脂族烯丙基底物(如3-氯-4-苯基丁-1-烯)的烯丙基化提供了良好的区域选择性,因此可以直接获得新的烯丙基苯基醚。