Trifluoroacetic acid → 4-(9-cyclopentyl-5-methyl-6-oxo-6,7,8,9-tetrahydro-5H-pyrimido[4,5-b][1,4]diazepin-2-ylamino)-3-methoxybenzoic acid

Participants

Reaction Steps

2-Chloro-9-cyclopentyl-5-methyl-8,9-dihydro-5H-pyrimido[4,5-b][1,4]diazepin-6(7H)-one (Intermediate 1) (0.70 g, 2.5 mmol, 1 eq), 4-amino-3-methoxybenzoic acid (1.25 g, 7.5 mmol, 3 eq) and TFA (0.93 mL, 12.5 mmol, 5 eq) were heated to reflux in TFE (25 mL) for 20 hours. Solvent was evaporated in vacuo and the resulting residue was triturated with MeOH to give 4-(9-cyclopentyl-5-methyl-6-oxo-6,7,8,9-tetrahydro-5H-pyrimido[4,5-b][1,4]diazepin-2-ylamino)-3-methoxybenzoic acid (0.66 g, 64%).

Provenance & Evidence