Benzoic acid (2R,3R,4S,6R)-6-(1-hydroxy-6,8-dimethoxy-3-methyl-7,12-dioxo-7,12-dihydro-benzo[a]anthracen-2-yl)-4-methanesulfonyloxy-2-methyl-tetrahydro-pyran-3-yl ester 在
sodium azide 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
以13%的产率得到Benzoic acid (2R,3S,4R,6R)-4-azido-6-(1-hydroxy-6,8-dimethoxy-3-methyl-7,12-dioxo-7,12-dihydro-benzo[a]anthracen-2-yl)-2-methyl-tetrahydro-pyran-3-yl ester