Metal-free Hydrogenation of Imines Catalyzed by B(C6F5)3
Typical Procedure: In a glovebox, B(C6F5)3 (18.2 mg, 0.0355 mmol, 20 mol%) is dissolved in dry diisopropylamine (2.5 mL, 1.8 g, 17 mmol) and the solution is added to N-benzylidene-tert-butylamine (28.7 mg, 0.177 mmol, 1 eq.). The resulting solution is transferred to a 25 mL bomb with a sealable Teflon tape and magnetic stirbar. The reaction vessel is sealed, removed from the glovebox and stirred at 100ºC for 24 h after which it is cooled to room temperature. The reaction mixture is quenched by the addition of silica followed by elution through a short silica column. The filtrate is concentrated in vacuo to give the desired product.
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