Cesium carbonate → 4(Indol-6-yloxy)-6-methoxy-7-(3-piperidinopropoxy)quinazoline

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A solution of 4-chloro-6-methoxy-7-(3-piperidinopropoxy)quinazoline (200 mg, 0.59 mmol), (prepared as described for the starting material in Example 67), 6-hydroxyindole (96 mg, 0.715 mmol) in DMF (3 ml) containing cesium carbonate (291 mg, 0.894 mmol) was heated at 90° C. for 4 hours. After cooling, the mixture was diluted with water, the precipitate was filtered, washed with water and dried under vacuum. The solid was purified by column chromatography eluting with methylene chloride/methanol (90/10 increasing to 50/50) to give 4-(indol-6-yloxy)-6-methoxy-7-(3-piperidinopropoxy)quinazoline (240 mg, 93%).

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