The enantioselective [3+2] cycloaddition reaction of dimethyl maleate with Schiff bases as the precursor of azomethine ylide was developed using axially chiral guanidine catalysts to provide optically active pyrrolidine derivatives. Acid-base dual-functional catalysis by an axially chiral guanidine through double hydrogen-bonding interaction is proposed to give the cycloaddition products in good yields.
利用轴向手性
胍催化剂,开发了
马来酸二甲酯与作为
氮丙啶亚甲基前体的席夫碱的[3+2]手性环加成反应,以提供具有光学活性的
吡咯烷衍
生物。通过双氢键相互作用,轴向手性
胍的酸碱双功能催化可提高环加成产物的收率。