L. Dechoux et al., TANDEM ADDITION BROMOFUNCTIONALIZATION OF GAMMA,DELTA-UNSATURATED GRIGNARD-REAGENTS TO BENZONITRILES, Synthesis, (3), 1995, pp. 242-244
The tandem addition of but-3-enylmagnesium bromide to benzonitriles fo
llowed by electrophilic (Br+) trapping of the intermediate, afforded 2
-aryl-5-bromomethyl-3,4-dihydro-2H-pyrroles in one step.