2,6-dioxo-5-phenoxy-1,2,3,6-tetrahydro-pyrimidine-4-carboxylic acid 、
硫酸 、
氯化亚砜 、
乙醇 在
silica gel 作用下,
反应 12.0h,
以There are obtained 520 mg of ethyl 2,6-dioxo-5-phenoxy-1,2,3,6-tetrahydro-pyrimidine-4-carboxylate as a solid的产率得到2,6-dioxo-5-phenoxy-1,2,3,6-tetrahydro-pyrimidine-4-carboxylic acid ethyl ester