Phosphorus oxychloride → 2-Chloro-4-(4-aminosulfonylbenzyl)quinazoline

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Reaction Steps

A mixture of 2,4-dichloroquinazoline [prepared from benzoyleneurea and POCl3 by the method of Butler et al., J. Chem. Soc. 1959, 1512.] (100 mg, 0.502 mmol, 1 eq), 4-aminosulfonylbenzylamine hydrochloride (117.5 mg, 0.527 mmol, 1.05 eq) and diisopropylethylamine (0.26 mL, 1.506 mmol, 3 eq) in absolute ethanol (1.6 mL) was stirred at ambient temperature for 4 h. The precipitated solid was collected by filtration, washed with water and cold ethanol, and dried to afford 154 mg (88%) of 2-chloro-4-(4-aminosulfonylbenzyl)quinazoline as a white solid. LC/MS: 349 [M+H]+; HPLC: 96% at 1.86 min (Primesphere 5 μm C18 column 4.6×30 mm, 10–90% aqueous methanol over 2 min containing 0.2% phosphoric acid, 5 mL/min, monitoring at 254 nm); 1H NMR (400 MHz, DMSO-d6): δ 9.37 (t, J=5.8 Hz, 1 H), 8.32 (d, J=8.2 Hz, 1 H), 7.85–7.53 (m, 7 H), 7.32 (s, 2 H), 4.81 (d, J=5.7 Hz, 2 H).

Provenance & Evidence