ethyl 5-benzyloxy-2-{1-(2-(dimethylsulfonium)ethoxy)ethyl}-6-oxo-1,6-dihydropyrimidine-4-carboxylate iodide 在
potassium carbonate 作用下,
以
DMF (N,N-dimethyl-formamide) 为溶剂,
反应 40.0h,
以70%的产率得到ethyl 3-(benzyloxy)-9-methyl-4-oxo-4,6,7,9-tetrahydropyrimido[2,1-c][1,4]oxazine-2-carboxylate