L-Tyrosine 1,1-dimethylethyl ester → N-(4-ethoxy-1-oxo-1,2,5-thiadiazol-3-yl)-L-tyrosine tert-butyl ester

Participants

Reaction Steps

A solution of 3,4-diethoxy—1-oxo—1,2,5-thiadiazole (1 g, 0.52 mmol) and L-tyrosine t-butyl ester (1.25 g, 0.52 mmol) in ethanol (25 mL) was stirred at room temperature for 60 hr. Solvent was removed under reduced pressure and the residue purified by flash column chromatography (silica, hexane:EtOAc 1:1 to give the title intermediate (1.75 g, 88%).

Provenance & Evidence