ethyl 2-(1-benzoyl-4-(2-(methylsulfonyloxy)ethoxy)piperidin-4-yl)-5-hydroxy-1-(methylsulfonyl)-6-oxo-1,6-dihydropyrimidine-4-carboxylate 在
potassium carbonate 作用下,
以
四氢呋喃 、
乙醇 为溶剂,
反应 18.0h,
以36%的产率得到ethyl 1-benzoyl-3'-hydroxy-4'-oxo-6',7'-dihydro-4'H-spiro[piperidine-4,9'-pyrimido[2,1-c][1,4]oxazine]-2'-carboxylate