Pd(II)-Catalyzed Tandem Cycloannulative-Alkenylation of o-Alkynyl-Phenols/Anilines with (E)-β-Iodovinyl Sulfones: A Direct Strategy To Construct 3-(Vinyl sulfonyl)benzoheterole Derivatives,The Journal of Organic Chemistry

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Pd(II)-Catalyzed Tandem Cycloannulative-Alkenylation of o-Alkynyl-Phenols/Anilines with (E)-β-Iodovinyl Sulfones: A Direct Strategy To Construct 3-(Vinyl sulfonyl)benzoheterole Derivatives
The Journal of Organic Chemistry ( IF 3.3 ) Pub Date : 2023-06-07 , DOI: 10.1021/acs.joc.3c00671
Raju Jannapu Reddy ₁ , Nunavath Sharadha ₁ , Gamidi Rama Krishna ₂

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Benzoheteroles and vinyl sulfones are the most promising pharmaceutical relevance motifs, yet the hybrid analogues of these scaffolds still need to be explored. We report herein a general and highly efficient Pd(OAc)₂-catalyzed intramolecular cyclization and vinylation of o-alkynylphenols/o-alkynylanilines with (E)-β-iodovinyl sulfones under mild reaction conditions. A direct C(sp²)–C(sp²) cross-coupling is enabled for the diversity-oriented synthesis of vinyl sulfone-tethered benzofurans and indoles in good to high yields with excellent stereoselectivity. Notably, this tandem process was consistent at the gram scale, and in situ, generation of 2-(phenylethynyl)phenol has also been utilized in a scalable synthesis. Late-stage synthetic transformations were also further explored, including isomerization and desulfonylative-sulfenylation. Moreover, several control experiments were accomplished, and we proposed a plausible mechanism based on existing experimental results.

中文翻译：

Pd(II) 催化的邻炔基苯酚/苯胺与 (E)-β-碘乙烯基砜的串联环环烯基化：构建 3-(乙烯基磺酰基)苯并杂环衍生物的直接策略

苯并杂环和乙烯基砜是最有前途的药物相关基序，但这些支架的混合类似物仍需要探索。我们在此报道了在温和反应条件下，Pd(OAc) _2催化的邻炔基酚/邻炔基苯胺与( E )-β-碘乙烯基砜的通用且高效的分子内环化和乙烯基化。直接 C(sp ² )–C(sp ²) 交叉偶联可实现乙烯基砜系苯并呋喃和吲哚的多样性导向合成，收率良好至高，且具有优异的立体选择性。值得注意的是，这种串联过程在克规模上是一致的，并且原位生成 2-(苯基乙炔基)苯酚也已用于可扩展的合成中。还进一步探索了后期合成转化，包括异构化和脱磺酰化-磺酰化。此外，还完成了一些控制实验，并根据现有实验结果提出了一种合理的机制。

更新日期：2023-06-07

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