Tert-butyl 4-cyano-4-(5-methylisoxazol-3-yl)piperidine-1-carboxylate → Tert-butyl 4-(aminomethyl)-4-(5-methylisoxazol-3-yl)piperidine-1-carboxylate

Participants

Reaction Steps

470 mg tert-butyl 4-cyano-4-(5-methylisoxazol-3-yl)piperidine-1-carboxylate and 1.24 g Bu4NBH4 were dissolved in 10 ml dichloromethane in a sealed tube and heated in a microwave reactor to 80 C for 1 hour. The reaction mixture was cooled to room temperature, the vial opened and the excess borohydride was quenched by slow addition of 5 ml MeOH. After stirring for 1 hour the vial was re-sealed and heated to 100 C. for 20 minutes (to hydrolyse the boron complex of the product). The reaction mixture was poured into sat. aq. NaHCO3 solution and extracted with dichloromethane. The organic layer was washed with brine, dryed over MgSO4, filtered and concentrated. The crude title amine (0.51 g, quant. yield) was used “as is”.

Provenance & Evidence