Potassium Hydroxide → HCID 136027629, compound

Participants

Reaction Steps

Aqueous 1M KOH (3.8 mL, 3.8 mmol) was added to a 3:2 mixture of 1-(7-dimethylamino-4-oxo-3,4-dihydro-quinazolin-2-yl)-1H-pyrazole-4-carboxylic acid ethyl ester and 1-(5-dimethylamino-4-oxo-3,4-dihydro-quinazolin-2-yl)-1H-pyrazole-4-carboxylic acid ethyl ester (0.415 g, 1.27 mmol) in THF (3.8 mL). The reaction mixture was allowed to stir at room temperature for 18 h and was then concentrated. The residue was re-dissolved in water (10 mL) and acidified with aqueous HCl (1 M, 3 mL). The resulting precipitate was collected by filtration to yield a mixture of the titled compound and 1-(7-dimethylamino-4-oxo-3,4-dihydro-quinazolin-2-yl)-1H-pyrazole-4-carboxylic acid. The collected precipitate was triturated from DMSO and rinsed with ethanol to yield pure 1-(7-dimethylamino-4-oxo-3,4-dihydro-quinazolin-2-yl)-1H-pyrazole-4-carboxylic acid. The filtrate from the trituration was purified by reverse-phase HPLC to yield the titled compound (49.7 mg, 13% yield). MS (ESI/Cl): mass calcd. for C14H13N5O3, 299.1; m/z found, 300.1 [M+H]+. 1H NMR (400 MHz, DMSO-d6): 12.99 (s, 2H), 8.96 (d, J=0.6 Hz, 1H), 8.25 (s, 1H), 7.84 (t, J=8.1 Hz, 1H), 7.67-7.48 (m, 2H), 3.12 (s, 6H).

Provenance & Evidence