作者:Ashok K. Basak、Naoyuki Shimada、William F. Bow、David A. Vicic、Marcus A. Tius
DOI:10.1021/ja103028r
日期:2010.6.23
An organocatalytic asymmetric Nazarov cyclization of diketoesters that proceeds by means of a dual activation mechanism has been developed. Screening of a number of catalysts led to a new thiourea that incorporates a primary amino group. The method gives rise to cyclic products with two adjacent quaternary asymmetric carbon atoms, one of which is an all-carbon stereocenter, with complete or nearly
已经开发了通过双重活化机制进行的二酮酯的有机催化不对称 Nazarov 环化。对许多催化剂的筛选产生了一种新的硫脲,它包含一个伯氨基。该方法产生具有两个相邻季不对称碳原子的环状产物,其中一个是全碳立体中心,具有完全或几乎完全的非对映选择性和高或非常高的对映体过量。还描述了通过亲核加成到乙烯酮的无环二酮酯起始材料的简单且非常方便的合成。