4-(Morpholin-4-yl)-5,6,7,8-tetrahydropyrido[3,4-d]pyrimidine → 6,7-Dimethoxy-2-(4-morpholino-5,6-dihydropyrido[3,4-d]pyrimidin-7(8H)-yl)quinazolin-4(3H)-one

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A mixture of 2-chloro-6,7-dimethoxy-3H-quinazolin-4-one 1b (0.28 g, 1.18 mmol) and 4-morpholin-4-yl-5,6,7,8-tetrahydro-pyrido[3,4-d]pyrimidine 6a (0.26 g, 1.20 mmol) in methoxyethanol (10 mL) was heated to 100° C. with stirring for 18 h. After cooling to room temperature, the precipitated solid was separated by filtration, washed with methoxyethanol and dried to give 0.31 g of 6,7-dimethoxy-2-(4-morpholin-4-yl-5,8-dihydro-6H-pyrido[3,4-d]pyrimidin-7-yl)-3H-quinazolin-4-one 201, mp. 287.7–290.4° C.

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