Synthesis of δ-(<scp>L</scp>-α-aminoadipoyl)-<scp>L</scp>-cysteinyl-<scp>D</scp>-valine and some carbon-13 and nitrogen-15 labelled isotopomers

Abstract

δ-(L-α-Aminoadipoyl)-L-cysteinyl-D-valine (7a), δ-(L-α-aminoadipoyl)-L-[3-13C]cysteinyl-D-valine (7b), δ-(L-α-aminoadipoyl)-L-[3-13C]cysteinyl-D-[3-13C]valine (7c), and δ-(L-α-aminoadipoyl)-L-[3-13C]cysteinyl-D-[3-13C, 15N]valine (7d) were prepared by conventional means using benzyl-based protective groups.