The synthesis of 1-chloroalkyl carbonates and their reaction with various type of amines are described. This reaction is useful for the synthesis of carbamate pesticides and for the protection of various amino groups, including amino acids.
L-aspartic acid bis(trimethylsilyl) ester: a convenient starting material for the acylation of L-aspartic acid.
作者:Ana M. Castano、Antonio M. Echavarren
DOI:10.1016/0040-4020(92)85013-5
日期:1992.1
Reaction of L-aspartic acid with excess of bis(trimethylsilyl)amine under reflux provides optically pure L-aspartic acid bis(trimethylsilyl) ester in quantitative yield. This silyl ester reacts with a variety of acylating reagens in tetrahydrofuran to give N-protected aspartic acids and dipeptides in good yields without racemization.
Functionalisation of beta or gamma carboxyl group of aspartic and glutamic acids with labile substituents was performed via the use of N-trichloroethoxycarbonyl-5-oxazolidinone as protective group.