Origin of and a Solution for Uneven Efficiency by Cinchona Alkaloid-Derived, Pseudoenantiomeric Catalysts for Asymmetric Reactions
作者:Bin Hu、Mark W. Bezpalko、Chao Fei、Diane A. Dickie、Bruce M. Foxman、Li Deng
DOI:10.1021/jacs.8b09010
日期:2018.10.24
other hand, the subtle structural difference between pseudoenantiomeric cinchona alkaloids could also lead to uneven efficiency that severely limits the applicability of some cinchona alkaloid-catalyzed reactions. We describe here the elucidation of the origin of and the consequent development of novel modified cinchona alkaloids to address such a problem in asymmetric imine umpolung reactions by cinchonium
金鸡纳生物碱衍生的手性催化剂是应用最广泛的有机催化剂之一,已成功用于促进各种不对称反应。金鸡纳生物碱在自然界中以假对映体的形式存在,这使得金鸡纳生物碱催化的反应能够在许多反应中对感兴趣的两种对映体提供高对映选择性和产率。另一方面,假对映体金鸡纳生物碱之间的细微结构差异也可能导致效率不均匀,严重限制了一些金鸡纳生物碱催化反应的适用性。我们在此描述了新型改性金鸡纳生物碱的起源和随后的开发,以解决金鸡铵盐不对称亚胺极化反应中的此类问题。