Bentonitic earth catalyzed rearrangement of aryl 1, 1??dimethylpropargyl ethers. Synthesis of 2, 2??dimethyl??2H??1??benzopyrans

R Cruz??Almanza, F Pérez??Flores…

Index: Cruz-Almanza, Raymundo; Perez-Flores, Francisco; Brena, Leonardo; Tapia, Eva; Ojeda, Reyna; Fuentes, Aidee Journal of Heterocyclic Chemistry, 1995 , vol. 32, # 1 p. 219 - 222

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Citation Number: 8

Abstract

Abstract Mexican Bentonitic earth (Tonsil) catalyzed the Claisen rearrangement of aryl 1, 1- dimethylpropargyl ethers under mild conditions to provide 2, 2-dimethyl-2H-1-benzopyrans. The synthesis of encecalin 2f and desmethoxyencecalin 2i, two biologically active products among other natural products (2b, 2e) was performed by this procedure.

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