5-Brom-S-(methyl-2,3,4-tri-O-acetyl-β-D-glucuronopyranosyl)-4-thiouracil 在
mercury dibromide 作用下,
以
苯 为溶剂,
反应 1.0h,
以5%的产率得到(2S,3S,4S,5R,6R)-3,4,5-Triacetoxy-6-(5-bromo-2-oxo-4-thioxo-3,4-dihydro-2H-pyrimidin-1-yl)-tetrahydro-pyran-2-carboxylic acid methyl ester