tert-butyl (3S)-3-aminopiperidine-1-carboxylate → (S)-tert-Butyl 3-(1-(4-Methoxybenzyl)-1H-indazol-5-ylamino)piperidine-1-carboxylate

Participants

Reaction Conditions

Reaction Steps

To a solution of 5-bromo-1-(4-methoxybenzyl)-1H-indazole (870 mg, 2.75 mmol) in toluene (10 mL) was added in succession (S)-tert-butyl3-aminopiperidine-1-carboxylate (660 mg, 3.3 mmol), sodium tert-butoxide (475 mg, 5 mmol), and rac-(±)-BINAP (180 mg, 0.29 mmol). The flask was evacuated and refilled with nitrogen three times, after which Pd2 dba3 (83 mg, 1.5 mol %) was added. The flask was again purged with nitrogen three times, and was then heated to 80° C. overnight. The solution was cooled to room temperature and then filtered through a pad of celite, washing with additional toluene. The toluene solution was then loaded directly onto a silica gel column that had been packed with heptane. The column was flushed with 2 column volumes of heptane, and then eluted with 40/60-EtOAc/heptane to afford the title compound (1.00 g 82%).

Provenance & Evidence