Dichloromethane → tert-butyl 4-(3,3,7-trimethyl-2-oxo-2,3-dihydro-1H-pyrido[2,3-b][1,4]oxazin-1-yl)piperidine-1-carboxylate

Participants

Reaction Steps

At room temperature, to a dichloromethane solution (15 ml) of tert-butyl 4-[(2-hydroxy-5-methylpyridin-3-yl)amino]piperidine-1-carboxylate (3.08 g) were added 2,6-lutidine (2.25 ml) and 2-bromoisobutyryl bromide (1.74 ml). After stirring at room temperature for 18 hours, N,N-dimethylformamide (15 ml) was added, and stirred at 70° C. for 1 hour. The reaction solution was concentrated under reduced pressure, and the residue was purified by silica gel column chromatography to afford tert-butyl 4-(3,3,7-trimethyl-2-oxo-2,3-dihydro-1H-pyrido[2,3-b][1,4]oxazin-1-yl)piperidine-1-carboxylate (1.04 g).

Provenance & Evidence