ASYMMETRIC-SYNTHESIS OF TOPOGRAPHICALLY CONSTRAINED AMINO-ACIDS - SYNTHESIS OF THE OPTICALLY PURE ISOMERS OF ALPHA,BETA-DIMETHYL-PHENYLALANINE AND ALPHA,BETA-DIMETHYL-1,2,3,4-TETRAHYDROISOQUINOLINE-3-CARBOXYLIC ACID
All four isomers of alpha,beta-dimethylphenylalanine and alpha,beta-dimethyl-1,2,3,4-tetrahydroisoquinoline-3-carboxylic acid have been synthesized in high optical purity for use in the design of topographically constrained peptides.