重氮甲烷 、
2,5-Di-O-acetyl-3-O-benzyl-6-(benzyloxycarbonylamino)-1,6-didesoxy-1-<3,4-dihydro-2,4-dioxo-1(2H)-pyrimidinyl>-L-glycero-α-L-ido-heptofuranuronsaeure-methylester 以
甲醇 、
乙醚 为溶剂,
以97%的产率得到2,5-Di-O-acetyl-3-O-benzyl-6-(benzyloxycarbonylamino)-1,6-didesoxy-1-<3,4-dihydro-3-methyl-2,4-dioxo-1(2H)-pyrimidinyl>-L-glycero-α-L-ido-heptofuranuronsaeure-methylester