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Tandem Rh-Catalyzed [4 + 2] Vinylic C–H O‑Annulation of Exocyclic Enones with Alkynes and 1,5‑H Shift

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journal contribution
posted on 29.01.2018, 00:00 by Yinsong Zhao, Chuangui Yu, Tianbao Wang, Zhijie She, Xuesong Zheng, Jingsong You, Ge Gao
Active pyrylium intermediates are in situ generated by a Rh-catalyzed vinylic C–H annulation reaction between exocyclic α,β-enones and alkynes, which undergo a base-promoted rearrangement via 1,5-H shift to form 1H-benzo­[f]­chromene derivatives.