ASYMMETRIC-SYNTHESIS OF UNUSUAL AMINO-ACIDS - SYNTHESIS OF THE OPTICALLY PURE ISOMERS OF INDOLE-PROTECTED BETA-METHYLTRYPTOPHAN SUITABLE FOR PEPTIDE-SYNTHESIS
The four isomers of N-indole-(2-mesitylenesulfonyl)-beta-methyltryptophan have been synthesized in high optical purity using in part, asymmetric conjugate 1, 4-additions followed by chiral imide enolate azidation and reduction.