Novel photochemical transformation of 4-methyl-2′-hydroxyisoflavenes to benzofuro [3,2-b]benzofurans
Abstract
The photolysis of 4-methyl-3-(2-hydroxyphenyl)chrom-3-enes(1) in methanol at 300 nm affords 4b,9b-dihydro-4b, 9b-dimethylbenzofuro[3, 2-b]benzofurans (2), in good yield and the reaction rate is accelerated by sodium methoxide.