NBS bromination reactions of dihydronaphthofuran quinones: a new fragmentation type reaction in the chemistry of quinones

The reactions of isomeric dilydronaphthofuran-quinones of the alfa ß type, 1 and 5, respectively, with NBS, under visible light, gave products. These reactions represent a new route to structural types represented by naphthol [1,2-b] furan and naphtho [2,3-b] furan quinones and lead to a new assessment of biosynthetic theory concerning the furan ring in plants