A Convenient Asymmetric Synthesis of the Unnatural Amino Acid 2,6-Dimethyl-L-tyrosine
作者:John H. Dygos、Edward E. Yonan、Mike G. Scaros、Owen J. Goodmonson、Daniel P. Getman、Roy A. Periana、Gary R. Beck
DOI:10.1055/s-1992-26212
日期:——
The title compound was prepared in high optical purity by a five-step synthesis from 3,5-dimethylphenol on a kilogram scale. The key steps were a modified palladium-catalyzed coupling of an aryl iodide with methyl 2-acetamidoacrylate and hydrogenation of the resulting sterically hindered dehydroamino acid 4 using [Rh(1,5-COD)- (R,R-DIPAMP)]BF4 as catalyst.