Palladium??Catalyzed [2+ 2+ 1] Oxidative Annulation of 4??Hydroxycoumarins with Unactivated Internal Alkynes: Access to Spiro Cyclopentadiene??Chroman??2, 4?? …

…, S Sun, Y Peng, M Wu, H Guo, J Wang

Index: Peng, Shiyong; Gao, Tao; Sun, Shaofa; Peng, Yanhong; Wu, Minghu; Guo, Haibing; Wang, Jian Advanced Synthesis and Catalysis, 2014 , vol. 356, # 2-3 p. 319 - 324

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Citation Number: 10

Abstract

Abstract: Herein, we report our new results regarding a palladium-catalyzed [2+ 2+ 1] oxidative annulation of 4-hydroxycoumarins with unactivated internal alkynes, which affords a new class of compounds: the spiro cyclopentadiene-chroman-2, 4-diones. Keywords: CÀH activation; palladium-catalyzed oxidative annulations; ACHTUNGTRENNUNG [2+ 2+ 1] reactions; spiro complexes

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