A Chiral Bis(betaine) Catalyst for the Mannich Reaction of Azlactones and Aliphatic Imines
作者:Wen-Quan Zhang、Ling-Feng Cheng、Jie Yu、Liu-Zhu Gong
DOI:10.1002/anie.201107741
日期:2012.4.23
By design: New chiralbis(betaine)s, for example 1, containing two catalytically active centers have been designed. They have proven to be promising organocatalysts for the direct Mannich‐type reaction of azlactones with a broad spectrum of aliphaticimines, thus affording α‐tetrasubstituted α,β‐diamino acid surrogates with excellent enantioselectivities.