1-Deoxy-1-<(3-acetoxy-4-methylphenyl)(1,2,3,6-tetrahydro-2,6-dioxo-4-pyrimidinyl)amino>-D-ribitol 2,3,4,5-Tetracetate 、
原甲酸三乙酯 在
对甲苯磺酸 作用下,
以
二甲基亚砜 为溶剂,
以9.1%的产率得到1-Deoxy-1-(3,4-dihydro-8-acetoxy-7-methyl-2,4-dioxopyrimido<4,5-b>quinolin-10-(2H)-yl)-D-ribitol 2,3,4,5-Tetracetate