Triethylamine → 2-(4-(4-(2,5-Dichlorothiophene-3-carbonyl)piperazin-1-yl)phenyl)-5,7-dimethoxyquinazolin-4(3H)-one

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Reaction Steps

To a mixture of 5,7-dimethoxy-2-(4-(piperazin-1-yl)phenyl)quinazolin-4(3H)-one (0.150 g, 0.41 mmol) and 2,5-dichlorothiophene-3-carbonyl chloride (0.088 g, 0.41 mmol) in CH2Cl2 was added Et3N (0.086 mL, 0.62 mmol) and the mixture stirred at room temperature under nitrogen for 30 minutes. The mixture was concentrated and purified by silica gel chromatography, eluting with 70% CH2Cl2/(92:7:1 CHCl3/MeOH/concentrated NH4OH) to 100% (92:7:1 CHCl3/MeOH/concentrated NH4OH), to afford the title compound as a light yellow solid (0.177 g, 79%). 1H NMR (300 MHz, DMSO-d6): δ 11.80 (s, 1H), 8.12 (d, J=9.0 Hz, 2H), 7.27 (s, 1H), 7.05 (d, J=9.0 Hz, 2H), 6.69 (d, J=2.3 Hz, 1H), 6.48 (d, J=2.3 Hz, 1H), 3.88 (s, 3H), 3.84 (s, 3H), 3.73-3.82 (m, 2H), 3.38-3.44 (m, 6H). APCI MS m/z 545 [M+H]+.

Provenance & Evidence