Asymmetric synthesis using catalysts containing multiple stereogenic centres and a trans-1,2-diaminocyclohexane core; reversal of predominant enantioselectivity upon N-alkylation
作者:Alexander J.A. Cobb、Charles M. Marson
DOI:10.1016/j.tet.2004.11.030
日期:2005.1
N-Methylation of ligands containing a trans-1,2-diaminocyclohexane core and multiple stereogeniccentres is shown to provide the product of the opposite configuration in significant enantiomeric excess, in the addition of diethylzinc to aldehydes. Some of the ligands were effective in an asymmetric Michael addition.