Cyclohexanone → Isopropyl 8-amino-2,3-dimethylimidazo[1,2-a]pyridine-6-carboxylate

Participants

Reaction Conditions

Reaction Steps

To a suspension of 5,6-diamino-nicotinic acid isopropyl ester (1 eq., 5.1 g) in cyclohexanone (50 ml) bromobutanone (1.2 equiv., 3.4 ml) was added over 10 min. The dark brown mixture was heated to 100° C. (inner temperature) and stirred 1.5 h at this temperature. The suspension was cooled to room temperature and the pale yellow solid was filtered off and was washed with TBME (3×10 ml). Drying under reduced pressure at 45° C. Yield: 6.0 g (74%).

Provenance & Evidence