Cu(I)-Binaphthyldiimine Catalyzed Asymmetric Cyclopropanation of Olefin with Diazoacetate
作者:Hiroyuki Suga、Tomomi Fudo、Toshikazu Ibata
DOI:10.1055/s-1998-1824
日期:1998.8
Chiral 1,1′-binaphthyl-N,N′-bis(2,6-dichloro-benzy-lidene)-2,2′-diamine (1) was found to be an effective ligand for the copper-catalyzed enantioselective cyclopropanation of olefin with l-menthyl diazoacetate. For example, the reaction of 1,1-diphenylethylene with l-menthyl diazoacetate in the presence of CuOTf-1 complex in CH2Cl2 at -40 °C gave the corresponding cyclopropanecarboxylate in 98% ee.
研究发现,手性 1,1′-联萘-N,N′-双(2,6-二氯-苄基亚甲基)-2,2′-二胺(1)是铜催化的烯烃与重氮乙酸对映体选择性环丙烷化反应的有效配体。例如,在 CuOTf-1 复合物存在下,1,1-二苯基乙烯与重氮乙酸 l-薄荷酯在 CH2Cl2 中于 -40 °C 发生反应,生成相应的环丙烷羧酸酯,ee 为 98%。