Synthesis of α,α-Disubstituted α-Amino Esters: Nucleophilic Addition to Iminium Salts Generated from Amino Ketene Silyl Acetals
作者:Shingo Hata、Hiroshi Koyama、Makoto Shimizu
DOI:10.1021/jo201692x
日期:2011.12.2
Alkoxycarbonyl iminium species are prepared easily by the oxidation of tetrasubstituted amino ketene silyl acetals, and subsequent nucleophilic addition of Grignard reagents to the iminium salts gives α,α-disubstituted α-amino ester derivatives in moderate to good yields, in which aryl and ethynyl substituents are readily introduced.
烷氧基羰基亚胺盐类很容易通过氧化四取代的氨基乙烯酮甲硅烷基乙缩醛来制备,随后将格氏试剂亲核加到亚胺盐中,可以中等至良好的收率得到α,α-二取代的α-氨基酯衍生物,其中芳基和乙炔基取代基容易介绍。