Abstract

Abstract Reaction of naringenin (1) with 2-methylbut-3-en-2-ol in the presence of BF3–Et2O gives a mixture of 6-C-prenyl-(5), 8-C-prenyl-(8) and 6,8-di-C,C-prenyl-(2) derivatives. The last compound (2) with DDQ afforded 8-C-prenyl-6″,6″-dimethylpyrano(2″,3″:7,6)naringenin (11) along with its angular isomer (10) in racemic forms.

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