Synthesis of All Distinct α-Methyl-Substituted Isomers of Amino Bis(2,2′-Ethanoic Acid) Diethyl Ester and Ethylene Diamine Tetraacetic Acid Tetraethyl Ester Scaffolds
作者:Shabana S Insaf、Donald T Witiak
DOI:10.1016/s0040-4020(00)00103-4
日期:2000.4
The syntheses of three dialkylated and six tetraalkylated ethylene diamine tetraacetic acid tetraesters is described. The dialkylated derivatives were synthesized by a convergent non-racemizing route to yield three enantiomerically and diastereomerically pure tetraesters (SS)-, (RR)- and (R∗S∗)- in 55–57% yields from alanine ethyl ester 1. Enantiomerically and diastereomerically pure tetraalkylated