Scheme 4. Versatile approach to Vorinostat® through photocatalytic conjugate addition. [a] 48 (1.0 equiv.), 47 (3.0 equiv.), Na₂CO₃ (2.0 equiv.), (Me₃Si)₃SiH (0.75 equiv.) and Ir[dF(CF₃)ppy]₂(dtbbpy)PF₆ (1 mol%) in MeOH, integrated photoreactor (reactor), 1 h.