Scope of the N-Boc deprotection by manganese-catalyzed transfer hydrogenation^a.

^aReaction conditions: substrates 4r–4v (0.5 mmol), Mn–IV (2 mol%), KOtBu (6 mol%), toluene (1 mL), iPrOH (1 mL), 140 °C, 16 h. The yield was determined by GC using mesitylene as the internal standard.

^bThe yield was determined by ¹H-NMR using mesitylene as the internal standard.

^cIsolated yield.