Tandem Norrish Type I reaction and intramolecular arene–alkene meta-photocycloaddition: novel photoisomerization of aryl-substituted norbornan-2-ones to triquinanes
摘要:
Irradiation of the aryl-substituted norbornan-2-ones 6 and 7 at 254 nm furnishes the triquinanes 16 and 17 (from 6) and 18 (from 7) via tandem Norrish Type I reaction and intramolecular arene-alkene meta-photocycloaddition of the intermediate unsaturated lactols 12 and 13, respectively.