A conceptually new methodology to give unusual cyclization products from usual migration substrates was disclosed. The highly complex and structurally important and valuable spirocyclic compounds were produced through radical addition, intramolecular cyclization and ring opening instead of usual migration to the di-functionalization products of olefins. Furthermore, a plausible mechanism was proposed based on a series of mechanistic studies including radical trapping, radical clock, verification experiments of intermediates, isotope labeling and KIE experiments.

中文翻译：

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螺自由基的分子内捕获以从通常的迁移底物产生不寻常的环化产物

公开了一种概念上的新方法，可以从通常的迁移底物中得到不寻常的环化产物。高度复杂、结构重要且有价值的螺环化合物是通过自由基加成、分子内环化和开环而不是通常迁移到烯烃的双官能化产物而产生的。此外，基于自由基捕获、自由基时钟、中间体验证实验、同位素标记和 KIE 实验等一系列机理研究，提出了一个似是而非的机理。