The new domino process disclosed here involves PBu3 as both a nucleophilic and a reducing agent. The process combines suitable electron-poor dienes, N-tosylimines, tri-n-butylphosphane and water. The final products formally result from reduction of vinylogous aza-Morita–Baylis–Hillman adducts. The reaction proceeds with an excellent stereochemical control of the relative configurations of the newly