Highly Enantioselective 1,4-Michael Additions of Nucleophiles to Unsaturated Aryl Ketones with Organocatalysis by Bifunctional Cinchona Alkaloids
作者:Cristina G. Oliva、Artur M. S. Silva、Diana I. S. P. Resende、Filipe A. A. Paz、José A. S. Cavaleiro
DOI:10.1002/ejoc.201000273
日期:——
The development of general and efficient asymmetric organocatalytic additions of malononitrile and nitromethane to 1,5-diarylpenta-2,4-dien-1-ones (cinnamylideneacetophenones) catalyzed by cinchona organocatalysts is reported. The reactions afforded excellent enantioselectivities (up to 99 %), high yields (up to 97 %), and exclusive 1,4-addition regioselectivities. The potential of these new enantioselective
报道了在金鸡纳有机催化剂的催化下,丙二腈和硝基甲烷向 1,5-diarylpenta-2,4-dien-1-ones(肉桂基苯乙酮)的通用和高效的不对称有机催化加成的发展。这些反应提供了出色的对映选择性(高达 99%)、高产率(高达 97%)和独有的 1,4-加成区域选择性。这些新的对映选择性加成的潜力在于证明带有伯氨基的有机催化剂与 TFA 结合提供了有效的催化系统,用于在温和条件下活化各种芳基酮,从而得到具有高水平对映选择性和产率的化合物。