3-[2-methyl-5-(tetrahydro-pyran-2-yloxymethyl)-thiazol-4-yl]-benzoic acid methyl ester 、 Lithium Tert-butyl Acetate 以to give crude 3-oxo-3-[3-[2-methyl-5-(tetrahydro-pyran-2-yloxymethyl)-thiazol-4-yl]-phenyl]-propionic acid tert-butyl ester (5.45 g) as a pale-yellow oil的产率得到3-oxo-3-[3-[2-methyl-5-(tetrahydro-pyran-2-yloxymethyl)-thiazol-4-yl]-phenyl]-propionic acid tert-butyl ester