UNUSUAL AMINO-ACIDS .4. ASYMMETRIC-SYNTHESIS OF THIENYLALANINES

(Z)-2-N-Acylamino-3-thienyl-acrylic acids and their esters were prepar ed by known procedures and hydrogenated to the corresponding optically active 2-N-acetyl(or benzoyl)-3-(2- or 3-thienyl)-alanines with optic al yields up to 90 % using the rhodium complexes of ''PROPRAPHOS'' 6a, b and phino)-2-exo-hydroxy,3-endo-methylamino-norbornane 6c as chiral catalysts, Recrystallization and deacylation of the obtained amino aci d derivatives yields the optically pure hydrochlorides of the thienyla lanines and the free amino acids.