反应详情

1-Chloro-6,7-dimethoxyphthalazine (4.5 g), N-(piperid-4-yl)-N-methyltrifluoracetamide hydrochloride (9.9 g) and triethylamine (5.5 ml) were heated together for 5 hours at 100° in iso-amylalcohol (100 ml). The solution was cooled to room temperature and the excess iso-amylalcohol was removed by distillation in vacuo. The residue was dissolved in dilute hydrochloric acid to pH 2, extracted with chloroform (2×100 ml), the chloroform extract shaken with dilute sodium hydroxide, and then quickly separated. The organic phase was washed with water (150 ml), dried over magnesium sulphate, and taken to dryness in vacuo. The resultant brown oil was triturated with ether, filtered, and the filtrate was left standing at room temperature for two hours, during which time a yellow solid precipitated from solution. This solid was collected and crystallized from iso-propylalcohol, yielding 6,7-dimethoxy-1-[4-(N-methyltrifluoracetamido)piperidino]phthalazine (2.9 g), m.p. 150°-152°.

1. customthe excess iso-amylalcohol was removed by distillation in vacuo
2. dissolutionThe residue was dissolved in dilute hydrochloric acid to pH 2
3. extractionextracted with chloroform (2×100 ml)
4. extractionthe chloroform extract
5. customquickly separated
6. washThe organic phase was washed with water (150 ml)
7. dry with materialdried over magnesium sulphate
8. customThe resultant brown oil was triturated with ether
9. filtrationfiltered
10. waitthe filtrate was left
11. customa yellow solid precipitated from solution
12. customThis solid was collected
13. customcrystallized from iso-propylalcohol