反应详情

A suspension of 1.2 g (5.2 mmol) of methyl 3-amino-7-methoxy-2-naphthoate in 30 mL of dimethylformamide dimethylacetal is refluxed for 2.5 hours. The mixture is cooled to room temperature. The resulting precipitate is collected by filtration and washed with ether. After drying in vacuo, this yields 1.28 g (85.9%) of methyl 3-{[(E)-(dimethylamino)methylidene]amino}-7-methoxy-2-naphthoate as a light yellow solid, mp 160–162° C.,

1. temperatureis refluxed for 2.5 hours
2. filtrationThe resulting precipitate is collected by filtration
3. washwashed with ether
4. customAfter drying in vacuo