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手性铜(Ⅱ)-席夫碱配合物催化苯乙烯不对称环丙烷化反应

仇敏;刘国生;姚小泉;郭明彦;潘桂芝;郑卓

  Twelve chiral copper(Ⅱ)Schiff base complexes, derived from (R)(+)2amino1,1diaryl1propanol with substituted salicylaldehydes, were examined as a catalyst for asymmetric cyclopropanation of styrene with ethyl diazoacetate. It was found that the substituents at 3and 5positions of salicylaldehyde in the ligands had great effects on catalytic activity and enantioselectivity of the catalyst. The complex with strong electronwithdrawing group (NO2) at 5position and the smallest stereohinder (H) at 3position of salicylaldehyde showed highly catalytic activity and enantioselectivity, up toee=874% fortransandee=828% forcisisomers respectively, and the ratio 39/61 ofcistotransisomers was obtained at 40 ℃ with 1,2dichloroethane as solvent.……   
[关键词]:手性铜(Ⅱ)席夫碱;配合物;不对称催化;苯乙烯;环丙烷化
[文献类型]:期刊
[文献出处]: 《催化学报2001年01期
[格式]:PDF原版; EPUB自适应版(需下载客户端)