Unusual amino acids VII. Asymmetric synthesis of 3- and 4-pyridylalanines

Article abstract of DOI:10.1016/0957-4166(95)00428-9

(Z)-2-N-Acylamino-3-pyridyl-acrylic acids and their esters were prepared by partially known procedures and hydrogenated in the presence of HBF₄ to the corresponding optically active 2-N-acetyl-(or benzoyl-)-3-(3- or 4-pyridyl)-alanines or analo