For the first time the rhodium-catalyzed 1,4-addition of organoboranes to hindered Baylis−Hillman adducts, trisubstitutedalkenes, affording highly functionalized alkenes, via addition of the organoboranes and hydroxyelimination, is reported. Moreover, preliminary results have shown that, thanks to the use of a monosubstituted chiral diene ligand, enantio-enriched products were easily accessible, while