Quinine-catalyzed enantioselective tandem conjugate addition/intramolecular cyclization of malononitrile and 1,4-dien-3-ones
作者:Zhi-Peng Hu、Jian Li、Xiao-Gang Yin、Xue-Jing Zhang、Ming Yan
DOI:10.3998/ark.5550190.0014.301
日期:——
An organocatalytic tandem conjugate addition / intramolecular cyclization of malononitrile and conformationally restricted 1,4-dien-3-ones has been developed. A series of cinchona alkaloids and their derivatives were examined as the catalysts. Quinine was found to be the most efficient catalyst in the absence of any additive. The reaction gave 2-amino-4H-pyrans with high yield and excellent enantiopurity
已开发出丙二腈和构象受限的 1,4-二烯-3-酮的有机催化串联共轭加成/分子内环化。研究了一系列金鸡纳生物碱及其衍生物作为催化剂。在没有任何添加剂的情况下,奎宁被发现是最有效的催化剂。该反应仅使用 5 mol% 奎宁作为催化剂,以高收率和优异的对映纯度得到 2-氨基-4H-吡喃。