Sodium hydride (60%, 251 mg, 6.3 mmol) is introduced into N,N-dimethylformamide (13 ml), treated in portions with ethyl 7-hydroxy-4-(isopropylamino)quinazoline-6-carboxylate (1 g, 2.98 mmol) and subsequently stirred at room temperature for 30 minutes. After addition of a solution of 3-(methylthio)-1-(tosyloxy)propane (777 mg, 2.98 mmol) in N,N-dimethylformamide (8 ml), the mixture is stirred at 80° C. for one hour. After cooling, the batch is treated with water and ethyl acetate, and the organic phase is separated off and dried over sodium sulphate. The desired product is obtained after removing the solvents and preparative HPLC in 48% yield (548 mg).
