反应详情

2′-Chloro-9′-cyclopentyl-5′-methyl-8′,9′-dihydrospiro[cyclobutane-1,7′-pyrimido[4,5-b][1,4]diazepin]-6′(5′H)-one (Intermediate 4) (1.02 g, 3.18 mmol, 1 eq), 4-amino-3-methoxybenzoic acid (1.6 g, 9.5 mmol, 3 eq) and TFA (1.2 mL, 15.9 mmol, 5 eq) were heated to reflux in TFE (40 mL) for 24 hours. Solvent was evaporated in vacuo and the resulting residue was triturated with EtOAc to give 4-(9′-cyclopentyl-5′-methyl-6′-oxo-5′,6′,8′,9′-tetrahydrospiro[cyclobutane-1,7′-pyrimido[4,5-b][1,4]diazepine]-2′-ylamino)-3-methoxybenzoic acid (1.08 g, 75%).

1. temperatureto reflux in TFE (40 mL) for 24 hours
2. customSolvent was evaporated in vacuo
3. customthe resulting residue was triturated with EtOAc