An efficient B(C₆F₅)₃ catalyzed protocol for the synthesis of oxindole fused 1,3-oxazepanes from pyrrolidine-substituted aryl alkynones has been developed. A ring expansion of pyrrolidine and dual hydride transfer were involved in the cascade reactions. Transition metal-free conditions, good functional group tolerance and operational simplicity make this C(sp³)–H functionalization methodology attractive.

中文翻译：

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通过氢化物转移引发吡咯烷扩环合成羟吲哚稠合 1,3-氧杂氮杂环庚烷

开发了一种有效的 B(C ₆ F ₅ ) ₃催化方案，用于从吡咯烷取代的芳基炔酮合成羟吲哚稠合 1,3-氧氮杂环庚烷。级联反应涉及吡咯烷的扩环和双氢化物转移。无过渡金属的条件、良好的官能团耐受性和操作简单性使得这种 C(sp ³ )–H 官能化方法具有吸引力。