Methylamine → Ammonia

Participants

Reaction Conditions

Reaction Steps

Liquid methylamine (20 mL) was added to a cooled (−70° C.) solution of 6-benzyl-2-chloro-5,6,7,8-tetrahydro[1,6]naphthyridine (WO 9830560) (5.5 g, 21.25 mmol) in methanol (30 mL). The mixture was heated to 140° C. in a sealed vessel for 72 hours, then cooled. The reaction mixture was evaporated under reduced pressure and the residual brown oil purified by column chromatography on silica gel using an elution gradient of dichloromethane:methanol:0.88 ammonia (97:3:0 to 96:4:0.5) to afford the title compound as a white solid, 2.97 g

Provenance & Evidence