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PPh3-Catalyzed (3 + 3) Annulations of 5-Acetoxypenta-2,3-dienoate with 1C,3O-Bisnucleophiles: Facile Entry to Stable Monocyclic 2H-Pyrans

Jian Hu, Wei Dong, Xin-Yan Wu and Xiaofeng Tong*

*Key Laboratory for Advanced Materials and Institute of Fine Chemicals, East China University of Science and Technology, Meilong Road No. 130, Shanghai, 200237, P. R. China, Email:

J. Hu, W. Dong, X.-Y. Wu, X. Tong, Org. Lett., 2012, 14, 5530-5533.

DOI: 10.1021/ol302634p (free Supporting Information)

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Phosphine-catalyzed (3 + 3) annulations between allenoates and 1C,3O-bisnucleophiles provide a facile entry to stable 2H-pyrans which are greatly challenging targets in organic synthesis. (3 + 2) Annulations can be achieved with the assistance of base to yield furans.

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ID: J54-Y2012-3570