反应详情

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 N-(4-ethoxy-1-oxo-1,2,5-thiadiazol-3-yl)-L-tyrosine tert-butyl ester (1.75 g, 88%). MS (+ESI, m/e) 382 (M+H)+.

1. customSolvent was removed under reduced pressure
2. customthe residue purified by flash column chromatography (silica, hexane:EtOAc 1:1