(S)-2-tert-butoxycarbonylamino-3-methyl-butyric acid, 3-{3-tert-butyl-5-[(E)-2-(4-methanesulfonylamino-phenyl)-vinyl]4-methoxy-phenyl}-5-fluoro-2-oxo-2H-pyridin-1-ylmethyl ester 在
aqueous HBr 、
溶剂黄146 作用下,
以5 mg (37%)的产率得到N-{4-[5-tert-butyl-2-hydroxy-3-(2-oxo-1,2-dihydro-pyridin-3-yl)-phenylethynyl]-3-fluoro-phenyl}-methanesulfonamide