Ethyl 4-[7-(3-ethoxy-3-oxopropanoyl)-1,4-dioxa-7-azaspiro[4.4]nonan-6-yl]-2-ethyl-3-oxobutanoate 在
sodium ethanolate 作用下,
以
乙醇 为溶剂,
反应 1.0h,
以71%的产率得到ethyl 7'-(1-ethoxy-1-oxobutan-2-yl)-5'-oxo-3',5',8',8a'-tetrahydro-2'H-spiro[[1,3]dioxolane-2,1'-indolizine]-6'-carboxylate