An organobase‐controlled, divergent cascade reaction to construct spirocyclohexene indane‐1,3‐diones and coumarin‐fused cyclopentanes is reported. The cascade reaction is triggered by the 1,6‐addition of 3‐homoacylcoumarins to the indanedione‐derived acceptors and further regio/chemoselective reaction that preferentially resulted in spiro systems and fused cyclopentanes in a diversity‐oriented manner. The 1,6‐addition/aldol and 1,6‐addition/vinylogous Michael addition cascade processes were controlled by different base/solvent systems to the predominant formation of one of the two carbocyclic compounds.

中文翻译：

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通过有机碱控制的级联反应，以多样性为导向的螺环己烯茚-1,3-二酮和香豆素融合的环戊烷合成

据报道，通过有机碱控制的发散级联反应可构建螺环己烯茚-1,3-二酮和香豆素稠合的环戊烷。级联反应是由3-高酰基香豆素1,6加成到茚二酮衍生的受体上而引发的，进一步的区域/化学选择性反应优先导致螺系统和稠合环戊烷的融合。1,6-加成/醛醇缩合和1,6-加成/酒红色迈克尔加成的级联过程受不同的碱/溶剂体系控制，从而主要形成了两个碳环化合物之一。