A new method for the preparation of functionalized unnatural α-H-α-amino acid derivatives
作者:David J. Hyett、Mara Didonè、Thierry J.A. Milcent、Quirinus B. Broxterman、Bernard Kaptein
DOI:10.1016/j.tetlet.2006.08.096
日期:2006.10
α-H-α-amino acids is reported based on the α-alkylation of iminoacetic acid esters or amides. These imines are readily available by the reaction of glyoxylic acid esters with branched primary amines. The subsequent reaction with methanolic ammonia gave the corresponding iminoacetic acid amides. α-Alkylation of these imines with various electrophiles under basic conditions, followed by an acidic hydrolysis
据报道基于亚氨基乙酸酯或酰胺的α-烷基化制备α-H-α-氨基酸的新方法。这些亚胺可通过乙醛酸酯与支链伯胺反应而容易地获得。随后与甲醇氨的反应得到相应的亚氨基乙酸酰胺。这些亚胺在碱性条件下与各种亲电试剂的α-烷基化反应,然后进行酸性水解,以高达93%的收率得到α-氨基酸,酯或酰胺。在手性PTC条件下进行α-烷基化可得到具有90%ee的单烷基化氨基酸。