Synthesis of 4,4-Disubstituted Piperidine-2-carbonitriles and Piperidine-2,6-dicarbonitriles as Precursors for New α-Amino Acids
作者:Klaus Wanner、Cornelia Schmaunz
DOI:10.1055/s-0030-1260186
日期:2011.10
An easy and straightforward method for the synthesis of 4,4-disubstituted pipecolic acid and piperidine-2,6-dicarboxylic acid derivatives has been developed, based on the addition of cyanide ions to 4,4-disubstituted 1,4-dihydropyridines, which are easily accessible by trapping activated N-silylpyridinium ions with diorganomagnesium reagents. Acidic hydrolysis of the resulting 4,4-disubstituted pi
基于在4,4-二取代的1,4-二氢吡啶类化合物中添加氰化物离子,已开发出一种简单而直接的合成4,4-二取代的胡椒酸和哌啶-2,6-二羧酸衍生物的方法。通过用二有机镁试剂捕获活化的N-甲硅烷基吡啶离子,可轻松获得。所得的4,4-二取代的哌啶-2-腈和哌啶-2,6-二腈的各个非对映异构体的酸性水解导致高产率的相应α-氨基酸。 哌啶-吡啶-羧酸-腈-亲核加成-还原