Acetic acid (2R,3R,4S,5R,6R)-4,5-diacetoxy-6-acetoxymethyl-2-[5-(4-chloro-phenylazo)-3-cyano-4,6-dimethyl-2-oxo-2H-pyridin-1-yl]-tetrahydro-pyran-3-yl ester 在
氨 作用下,
以
甲醇 为溶剂,
以88%的产率得到5-[(4-chlorophenyl)diazenyl]-4,6-dimethyl-2-oxo-1-[(2R,3R,4S,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]pyridine-3-carbonitrile