Asymmetric Morita-Baylis-Hillman Reaction of Arylaldehydes with 2-Cyclohexen-1-one Catalyzed by Chiral Bis(Thio)urea and DABCO
作者:Min Shi、Xu-Guang Liu
DOI:10.1021/ol7028806
日期:2008.3.1
Novel bis(thio)urea organocatalysts were synthesized from axially chiral (R)-(-)-5,5',6,6',7,7',8,8'-octahydro-1,1'-binaphthyl-2,2'-diamine (H-8-BINAM), and their catalytic abilities have been examined in the Morita-Baylis-Hillman reaction of 2-cyclohexen-1-one or 2-cyclopenten-1-one with a wide range of aromatic aldehydes in combination with DABCO. The best result was achieved in the reaction of 3-fluorobenzaldehyde with 2-cyclohexen-1-one to give the desired Morita-Baylis-Hillman product in 79% yield and 88% ee.
Development of axially chiral bis(arylthiourea)-based organocatalysts and their application in the enantioselective Henry reaction
作者:Xu-Guang Liu、Jia-Jun Jiang、Min Shi
DOI:10.1016/j.tetasy.2007.11.008
日期:2007.11
Axially chiral bis(arylthiourea)-based organocatalyst 6b, prepared from (R)-(+) - 5,5', 6,6', 7,7', 8,8'-octahydro-1,1'-binaph thy) 2,2'-diamine, was found to be an effective chiral organocatalyst for the enantioselective Henry reaction of arylaldehydes with nitromethane to give the corresponding adducts in moderate enantioselectivities and good yields. (c) 2007 Elsevier Ltd. All rights reserved.