Hydrochloric 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 Conditions

Reaction Steps

2-Chloro-9-cyclopentyl-8,9-dihydro-5-methyl-5H-pyrimido[4,5-b][1,4]diazepin-6(7H)-one (150 mg, 0.536 mmol) in ethanol (2.25 ml) and water (9 ml) was treated with conc. HCl (0.088 ml) and 4-amino-3-methoxy benzoic acid (134 mg, 0.804 mmol). The mixture was stirred at 90° C. 24 hours, concentrated and the residue triturated with methanol/ether, filtered and the solid washed with ethanol then ether to give 4-(9-cyclopentyl-6,7,8,9-tetrahydro-5-methyl-6-oxo-5H-pyrimido[4,5-b][1,4]diazepin-2-ylamino)-3-methoxybenzoic acid as a buff powder (185.5 mg, 84%). NMR DMSO D6 1.51-1.79 (6H, m), 1.82-1.93 (2H, m), 2.70-2.75 (2H m), 3.18 (3H, s), 3.72-3.78 (2H, m), 3.98 (3H, s), 4.81-4.93 (1H, m), 7.57-7.64 (2H, m), 8.15-8.22 (2H, m), 9.46 (1H, br s); HPLC rt(min): 6.57.

Provenance & Evidence