Three Component Coupling of α-Iminoesters via Umpolung Addition of Organometals: Synthesis of α,α-Disubstituted α-Amino Acids
作者:Joshua S. Dickstein、Michael W. Fennie、Amber L. Norman、Betty J. Paulose、Marisa C. Kozlowski
DOI:10.1021/ja8073006
日期:2008.11.26
The synthesis of alpha,alpha-disubstituted alpha-amino acids by means of a three component coupling is reported. The coupling occurs through umpolung addition of organometallic reagents to the nitrogen of alpha-iminoesters. The resulting enolate intermediates subsequently react with electrophiles (aldehydes, imines, alpha,beta-unsaturated nitro, alkyl halides, acyl cyanides) to form a quaternary center
报道了通过三组分偶联合成 α,α-二取代 α-氨基酸。偶联通过有机金属试剂向α-亚氨基酯的氮原子加成而发生。所得烯醇中间体随后与亲电子试剂(醛、亚胺、α,β-不饱和硝基、卤代烷、酰基氰)反应以形成季中心。亲电试剂和亲核试剂组分的束缚提供环状α,α-二取代的α-氨基酸衍生物。