Chiral Bis(oxazolinyl)phenyl RuII Catalysts for Highly Enantioselective Cyclopropanation
作者:Jun-ichi Ito、Satoshi Ujiie、Hisao Nishiyama
DOI:10.1002/chem.200903514
日期:——
derivatives were achieved in the cyclopropanation of alkenes with tert‐butyl α‐diazoacetate by using 0.5 mol % of a mononuclear chiral ruthenium aqua complex containing the chiral bis(oxazolinyl)phenyl ligand, which was obtained via CH activation by RuCl3⋅3 H2O in the presence of Mg and cyclooctadiene (cod). Intramolecular cyclopropanation reactions using the new Ru complex also proceed with high
通过使用0.5 mol%的含有手性双(恶唑啉基)苯基的单核手性钌水合络合物,在用α-重氮乙酸叔丁酯对烯烃进行环丙烷化反应中,实现了反式-环丙烷衍生物的良好至优异的对映选择性(高达99%ee)配体,其通过C中得到通过的RuClħ活化3 ħ⋅3 2 ö在Mg和环辛二烯(COD)的存在。使用新型Ru配合物的分子内环丙烷化反应也以高收率和优异的对映选择性进行。