The preferred [3+2] cycloaddition before hetero-Diels–Alder reaction of 2-hydroxymethylene indanones derivatives with α-nitrosostyrene is described. New fused spiro-pyrroles-1′-oxide and spiro-1′,2′-oxazines structures are reported. The stereospecificity and regiospecificity of the cycloadditions are discussed.
                                    描述了在2-
羟基亚甲基茚满酮衍
生物与α-
亚硝基苯乙烯进行异狄尔斯-阿尔德反应之前优选的[3 + 2]环加成反应。报道了新的稠合螺-
吡咯-1'-氧化物和螺-1',2'-恶嗪结构。讨论了环加成的立体特异性和区域特异性。