Keywords 1,3-Dipolar cycloaddition;Spiroheterocycles;Fused pyrimidine ring;Nitrile oxide;Azomethine ylide;Crystal structure;

• 偶极环加成;螺杂环化合物;稠合嘧啶环系环合物;腈氧化物;甲亚胺叶立德;单晶结构;