Diethyl azodicarboxylate (793 mg, 4.56 mmol) was added portionwise at room temperature to a stirred suspension of 4-chloro-7-methoxyquinazolin-6-ol (800 mg, 3.80 mmol), 1-methylpyrrolidin-3-ol (422 mg, 4.18 mmol) and triphenylphosphine (1.3 g, 4.96 mmol) in dichloromethane (16 ml). The reaction mixture was stirred for 1 hour and then a further portion of diethyl azodicarboxylate (360 ul) and triphenylphosphine (0.65 mg) were added. The mixture was stirred for 1 hour and the resulting orange solution was purified directly by silica gel chromatography eluting with a 0-10% mixture of methanol in dichloromethane to 4-chloro-7-methoxy-6-[(1-methylpyrrolidin-3-yl)oxy]quinazoline (330 mg, 28% yield) as a tan coloured solid:
