Di-tert-butyl dicarbonate → 4-(6,7-Dimethoxy-4-quinazolinyl)-N-(3-isopropylphenyl)-1-piperazinecarboxamide

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To a solution of 2.05 g (9.39 mmol) of di-tert-butyl dicarbonate in 30 ml of dichloromethane was added 108 mg (0.88 mmol) of 4-(N,N-dimethylamino)pyridine. After the mixture was stirred at room temperature for 5 minutes, 1.26 ml (8.95 mmol) of 3-isopropylaniline was added thereto, followed by further stirring at room temperature for 30 minutes. To the reaction mixture was added 548 mg (2.00 mmol) of 6,7-dimethoxy-4-piperazinylquinazoline obtained by the method described in South African Patent No. 67 06512 (1968), followed by stirring at room temperature for 30 minutes. After the solvent was evaporated, the residue was purified by silica gel chromatography and recrystallized from ethyl acetate to give the desired compound as colorless crystals.

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