N. Monteiro et G. Balme, PALLADIUM-CATALYZED ALLYLATING HETEROANNULATION OF O-ALKYNYL-ALLYLOXYBENZENES - A ROUTE TO 2-SUBSTITUTED-3-ALLYLBENZO[B]FURANS, Synlett, (7), 1998, pp. 746-747
In the presence of palladium(0), o-alkynyl allyloxybenzenes produce 2-
substituted 3-allylbenzo[b]furans in fair yields. This heteroannulatio
n is promoted by the eta(3)-allyl palladium species issued from early
reaction of the catalyst with the starting allyl aryl ether.