S. Matsumoto et K. Mikami, PHOTOCHEMICAL CARBON SKELETAL REARRANGEMENT OF THE BAYLIS-HILLMAN PRODUCTS - BETA-C-H ACTIVATION LEADING TO FURANS, Synlett, (5), 1998, pp. 469
Furan ring formation was found in photochemical reaction of the methyl
ether of the Baylis-Hillman products. This reaction proceeds via beta
-C-H activation of the photo-excited carbonyl compounds.