Chlorosulfonic acid → 3-Amino-8-bromo-5,6-dihydrobenzo[f]quinazolin-1(2h)-one-9-sulfonylchloride

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Chlorosulfonic acid(100 g) was added to 3-amino-8-bromo-5,6-dihydrobenzo[f]quinazolin-1(2H)-one(6.20 g, 17.8 mmole) and the solution stirred overnight at room temperature. The reaction mixture was poured over ice, the collected solid washed with water, and dried under high vacuum to give 3-amino-8-bromo-5,6-dihydrobenzo[f]quinazolin-1(2H)-one-9-sulfonyl chloride(7.25 g, 90%). 1H NMR (DMSO-d6, 200 MHz) δ: 2.67-2.75 (m, 2H, Ar CH2), 2.81-2.88 (m, 2H, Ar CH2), 7.43 (s, 1H, Ar), 8.23 (br s, 2H, NH2), 8.91(s, 1H, Ar), 9.90-10.50 (v br s, 1H, NH). Anal Calculated for C12H9BrClN3O3S 1/2 H2O.9/20 H2SO4 : C,32.48; H,2.48; N,9.47; S,10.46. Found: C,32.68; H,2.37; N,9.20; S,10.40.

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