An expedient one-pot synthesis of carbocyclic spiro[5.5]undeca-1,4-dien-3-ones via 1,6-conjugate addition initiated formal [4+2] annulation sequences by employing p-quinone methides and sulfonyl allenols is presented. Furthermore, this synthetic protocol tolerates a wide variety of p-quinone methides and sulfonyl allenols and affords the corresponding structurally unique spiro[5.5]undeca-1,4-dien-3-ones in good yield under mild reaction conditions.

中文翻译：

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1,6-缀合物的添加引发了对苯醌甲基化物与磺酰基烯丙醇的正式[4 + 2]环空：螺旋[5.5] undeca-1,4-dien-3-one支架的独特获得。

提出了一种方便的一锅合成碳环螺[5.5] undeca-1,4-dien-3-one的方法，方法是通过对醌甲基化物和磺酰基烯丙醇通过1,6-缀合物加成引发的正式[4 + 2]环化序列进行。此外，该合成方案可耐受多种对醌甲基化物和磺酰基烯丙醇，并在温和的反应条件下以良好的收率提供相应的结构独特的螺[5.5] undeca-1,4-二烯-3-酮。