3-[5-(tetrahydro-pyran-2-yloxymethyl)-[1,3,4]thiadiazol-2-yl]-benzoic acid methyl ester 、 Lithium Tert-butyl Acetate 以to give crude 3-oxo-3-{3-[5-(tetrahydro-pyran-2-yloxymethyl)-[1,3,4]thiadiazol-2-yl]-phenyl}-propionic acid tert-butyl ester (8.9 g) as a pale-yellow oil的产率得到3-Oxo-3-{3-[5-(tetrahydro-pyran-2-yloxymethyl)-[1,3,4]thiadiazol-2-yl]-phenyl}-propionic acid tert-butyl ester