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Synthesis of Allenyl Sulfones via a TBHP/TBAI-Mediated Reaction of Propargyl Alcohols with Sulfonyl Hydrazides

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journal contribution
posted on 18.09.2015, 00:00 by Zheng Yang, Wen-Juan Hao, Shu-Liang Wang, Jin-Peng Zhang, Bo Jiang, Guigen Li, Shu-Jiang Tu
A new TBHP/TBAI-mediated reaction of propargyl alcohols with sulfonyl hydrazides in the presence of HOAc has been established, in which a wide variety of allenyl sulfones were obtained in moderate to excellent yields. Mechanistic studies indicate that this transformation involves HOAc-promoted sulfonohydrazide intermediate formation, sequential C–O, C–N, and N–S bond cleavage, and C–S bond formation. Significantly, this sulfonohylation proceeds in a radical process and shows highly functional group compatibility and excellent regioselectivity, with a short reaction time and inexpensive reagents.

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