作者:Ronald Grigg、James Kemp、John F. Malone、Shuleewan Rajviroongit、Tangthongkum Anant
DOI:10.1016/s0040-4020(01)86043-9
日期:1988.1
Imines of α-amino acid esters undergo regiospecific Michael addition to methyl acrylate or acrylonitrile in good yield in benzene at 25°C catalysed by benzyItrimethyl ammonium methoxide (BTAM). The Michael adducts cyclise to a mixture of two stereoisomeric polysubstituted proline ester derivatives in the presence of 1 mol. of BTAM. Mechanistic studies, involving chiral intermediates, show this cyclisation
α-氨基酸酯的亚胺在苄基甲基三甲基甲醇铵(BTAM)催化下于25°C在苯中以良好的产率向丙烯酸甲酯或丙烯腈中进行区域特异性的迈克尔加成反应。在1mol的存在下,迈克尔加合物环化成两种立体异构的多取代的脯氨酸酯衍生物的混合物。BTAM。涉及手性中间体的机理研究表明,这种环化反应是不利的5-(enolexo)-endo-trig过程的一个实例。