4-Aminothioureaprolinal Dithioacetal as a Catalyst for Highly Enantioselective Michael Additions of Ketones and Aldehydes to Nitroolefins
作者:Yong-Ming Chuan、Li-Yang Yin、Yan-Mei Zhang、Yun-Gui Peng
DOI:10.1002/ejoc.201001211
日期:2011.1
4-Aminothioureaprolinal dithioacetal 4a is a highly efficient catalyst for the asymmetric Michael addition of ketones and aldehydes to nitroolefins requiring only 3 mol-% catalyst loading. The reactions proceeded smoothly and gave syn selective adducts with excellent yields (up to 98 % yield), diastereoselectivity (up to >99:1 dr), and enantioselectivity (up to 99 % ee) under solvent free conditions
4-Aminothioureaprolinal dithioacetal 4a 是一种高效催化剂,用于酮和醛与硝基烯烃的不对称迈克尔加成反应,仅需 3 mol% 的催化剂负载。在室温下无溶剂条件下,反应顺利进行,得到顺式选择性加合物,产率高(产率高达 98%)、非对映选择性(高达 >99:1 dr)和对映选择性(高达 99% ee)。这种极其简单实用的程序增加了该反应的吸引力。