Scope of carbamates 4 for the manganese-catalyzed transfer hydrogenation^a.

^aReaction conditions: substrates 4b–4q (0.5 mmol), Mn–IV (2 mol%), KOtBu (6 mol%), toluene (1 mL), iPrOH (1 mL), 120 °C, 16 h. Yield was determined by GC using mesitylene as the internal standard.

^b50 mmol 4b, 30 h.

^cIsolated yield.

^d140 °C, 16 h.