反应详情

A solution of 16 grams (0.10 mole) of 1-naphthyl hydrazine, 15.1 grams (0.10 moles) of ethyl isonicotinate and 300 ml. of isopropanol are stirred and refluxed for 48 hours. The solvent is removed in vacuo and the resultant 2-(1-naphthyl)-isonicotinic acid hydrazide is added to 125 ml. of phosphorous oxychloride and stirred and refluxed for about 15 hours. The reaction mixture is then concentrated in vacuo and the resultant simi-solid dissolved in about 250 ml. methylene dichloride. The methylene dichloride layer is washed with 100 ml of cold 2N potassium hydroxide, 100 ml. of water, dried with magnesium sulfate, filtered and concentrated in vacuo. Crystallization from ethanol/ether yields 3-(4-pyridyl)-2H-naphtho[1,2-c]pyrazole, m.p. 271°-273°.

1. temperaturerefluxed for 48 hours
2. customThe solvent is removed in vacuo
3. additionthe resultant 2-(1-naphthyl)-isonicotinic acid hydrazide is added to 125 ml
4. temperaturerefluxed for about 15 hours
5. concentrationThe reaction mixture is then concentrated in vacuo
6. dissolutionthe resultant simi-solid dissolved in about 250 ml
7. washThe methylene dichloride layer is washed with 100 ml of cold 2N potassium hydroxide, 100 ml
8. dry with materialof water, dried with magnesium sulfate
9. filtrationfiltered
10. concentrationconcentrated in vacuo
11. customCrystallization from ethanol/ether