K. Albrecht et A. Demeijere, PALLADIUM-CATALYZED MULTIPLE COUPLING REACTIONS OF BETA-BROMOSTYRENE WITH NORBORNENE AND DICYCLOPENTADIENE, Chemische Berichte, 127(12), 1994, pp. 2539-2541
(E)-beta-Bromostyrene [(E)-2] reacts with norbornene (1a) or dicyclope
ntadiene (1b) in the presence of Pd(OAc)(2), K2CO3, and nBu(4)NBr in D
MF to yield a mixture of the 2:1 coupling products 4 and 5, while (Z)-
beta-bromostyrene [(2)-2] gives exclusively 5. Under analogous conditi
ons, (Z)-3-iodoacryclic acid (6) reacts with norbornene (1a) to give t
he diene 11 with an exo,exo-2,3-disubstituted norbornane skeleton.