Asymmetric Michael addition reactions of aldehydes to β-nitrostyrenes catalyzed by (S)–N-(D-prolyl-L-prolyl)-1 -triflicamido-3 -phenylpropan-2-amine
作者:Amol B. Gorde、Anas Ansari、Ramesh Ramapanicker
DOI:10.1016/j.tet.2021.132095
日期:2021.5
pan-2-amine, a catalyst previously reported by us for the asymmetric Michael addition of aldehydes to β-nitrostyrenes, 4 new molecules were designed and synthesized by increasing the distance between the triflicamide group and the secondary amino group in the catalyst. Under the optimized reaction conditions (S)–N-(D-prolyl-L-prolyl)-1-triflicamido-3-phenylpropan-2-amine exhibited high and improved
为了提高(S)– N-(D-脯氨酰基)-1-三酰胺基-3-苯基丙烷-2-胺的催化能力,以前我们曾报道过一种将醛不对称地迈克尔加成到β-硝基苯乙烯中的催化剂通过增加三氟甲酰胺基团和催化剂中仲氨基之间的距离,设计并合成了4个新分子。在优化的反应条件下(S)– N-(D-脯氨酰基-L-脯氨酰基)-1-三氟酰胺基-3-苯基丙烷-2-胺在较低的催化剂负载量(3mol%)下表现出高的和改善的催化活性和立体选择性。在对大量醛和β-硝基苯乙烯进行的研究中,迈克尔加合物的收率高(高达94%),具有出色的对映选择性(高达98%ee)和良好的至优异的非对映选择性(高达98) :2博士)。