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BF3·Et2O‑Promoted Cleavage of the Csp–Csp2 Bond of 2‑Propynolphenols/Anilines: Route to C2-Alkenylated Benzoxazoles and Benzimidazoles

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posted on 20.02.2015, 00:00 by Xian-Rong Song, Yi-Feng Qiu, Bo Song, Xin-Hua Hao, Ya-Ping Han, Pin Gao, Xue-Yuan Liu, Yong-Min Liang
A novel BF3·Et2O-promoted tandem reaction of easily prepared 2-propynolphenols/anilines and trimethylsilyl azide is developed to give C2-alkenylated benzoxazoles and benzimidazoles in moderate to good yields. Most reactions could be accomplished in 30 min at room temperature. This tandem process involves a Csp–Csp2 bond cleavage and a C–N bond formation. Moreover, both tertiary and secondary propargylic alcohols with diverse functional groups were tolerated under the mild conditions.

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