Chiral C2-symmetric bisferrocenyldiamines as ligands for transition metal catalyzed asymmetric cyclopropanation and aziridination
作者:Dong-Jei Cho、Sang-Jin Jeon、Hong-Seok Kim、Chan-Sik Cho、Sang-Chul Shim、Tae-Jeong Kim
DOI:10.1016/s0957-4166(99)00423-1
日期:1999.9
A new series of chiral C2-symmetric bisferrocenyldiimine 1 and bisferrocenyldiamines 2 and 3 proved to be efficient ligands for the copper(I)-catalyzed asymmetric cyclopropanation, cyclopropenation, and aziridination of alkenes and alkynes to give high diastereo- and enantioselectivity as well as high chemical yields. In some instances the enantiomeric excesses of cyclopropanated products are among
一系列新的手性C 2对称双二茂铁基二亚胺1和双二茂铁基二胺2和3被证明是铜(I)催化的烯烃和炔烃的不对称环丙烷化,环丙烷化和叠氮化的有效配体,从而提供了高非对映异构和对映选择性以及化学产率高。在某些情况下,环丙烷化产物的对映体过量是有报道以来最高的(> 97%ee)。比较研究表明,立体选择性在很大程度上取决于配体和底物的空间变化。其他过渡金属配合物,其中包含某些配体,例如Ru(3c)Cl 2,[(NBD)Rh(2)] ClO 4,[Cu(2)(MeCN)2 ] PF 6和Pd(2)Cl 2在环丙烷化反应中也显示出高对映选择性。