تفاعل #2286297

معادلة التفاعل

2,6-dibromo-4-(3-hydroxy-propyl)-phenol

2,6-Dibromo-4-(3-hydroxy-propyl)-phenol

potassium tert-butoxide

3,6-Dichloro-4-isopropyl pyridazine

3,6-dichloro-4-isopropyl pyridazine

→

3-[3,5-dibromo-4-(6-chloro-5-isopropyl-pyridazin-3-yloxy)-phenyl]-propan-1-ol

المردود 24.7%

3-[3,5-Dibromo-4-(6-chloro-5-isopropyl-pyridazin-3-yloxy)-phenyl]-propan-1-ol

المردود 24.7%

المذيبات

N,N-dimethyl acetamide

water

ظروف التفاعل

المعالجة

1. 1
   درجة الحرارةThe reaction was cooled to room temperature
2. 2
   استخلاصextracted with ethyl acetate (3×100 mL)
3. 3
   غسيلwere washed with a 1N aqueous sodium hydroxide solution (1×150 mL)
4. 4
   تجفيفThe organic layer was dried with sodium sulfate
5. 5
   ترشيحfiltered
6. 6
   تركيزconcentrated
7. 7
   أخرىThe resulting residue was purified by flash chromatography (Biotage 40M)
8. 8
   غسيلeluted with 15% ethyl acetate in hexanes
9. 9
   أخرىThe desired fractions were collected
10. 10
    تركيزconcentrated under vacuum
11. 11
    ترشيحfiltered
12. 12
    workup.ADDITIONThe solid was then diluted with a 1:1 mixture of isopropyl acetate
13. 13
    درجة الحرارةThe mixture was heated
14. 14
    درجة الحرارةto reflux
15. 15
    درجة الحرارةcooled to room temperature
16. 16
    أخرىThe solvent was decanted
17. 17
    ترشيحfiltered
18. 18
    أخرىdried under high vacuum overnight
19. 19
    تركيزThe filtrate was concentrated
20. 20
    workup.ADDITIONThe resulting solid was then diluted with a 1:1 mixture of isopropyl acetate
21. 21
    درجة الحرارةThe mixture was heated
22. 22
    درجة الحرارةto reflux
23. 23
    درجة الحرارةcooled to room temperature
24. 24
    أخرىThe solvent was decanted
25. 25
    ترشيحfiltered
26. 26
    أخرىto afford a second crop of solid which
27. 27
    أخرىwas dried under high vacuum overnight

الإجراء التجريبي

A mixture of 2,6-dibromo-4-(3-hydroxy-propyl)-phenol (20) (5.0 g, 16.3 mmol) in N,N-dimethyl acetamide (8 mL) was treated with potassium tert-butoxide (1.74 g, 15.48 mmol) under nitrogen at room temperature. The suspension was heated to 100° C. for 15 min and turned brown in color. 3,6-Dichloro-4-isopropyl pyridazine (7) (2.47 g, 12.9 mmol) was added to the suspension and the reaction was stirred at 140° C. for 24 h. The reaction was cooled to room temperature, diluted with water (180 mL) and extracted with ethyl acetate (3×100 mL). The organic layers were combined and were washed with a 1N aqueous sodium hydroxide solution (1×150 mL), followed by a saturated aqueous sodium chloride solution (1×150 mL). The organic layer was dried with sodium sulfate, filtered and concentrated. The resulting residue was purified by flash chromatography (Biotage 40M) eluted with 15% ethyl acetate in hexanes, followed by 25% ethyl acetate in hexanes, followed by 50% ethyl acetate in hexanes. The desired fractions were collected and concentrated under vacuum. The resulting solid was slurried in cold acetonitrile and filtered. The solid was then diluted with a 1:1 mixture of isopropyl acetate:methyl tert-butyl ether (20 mL). The mixture was heated to reflux and then cooled to room temperature. The solvent was decanted. The solid was slurried in heptane, filtered and dried under high vacuum overnight. The filtrate was concentrated. The resulting solid was then diluted with a 1:1 mixture of isopropyl acetate: methyl tert-butyl ether (20 mL). The mixture was heated to reflux and then cooled to room temperature. The solvent was decanted and the solid was slurried in heptane and filtered to afford a second crop of solid which was dried under high vacuum overnight. The solids were combined to afford 3-[3,5-dibromo-4-(6-chloro-5-isopropyl-pyridazin-3-yloxy)-phenyl]-propan-1-ol (21) (1.48 g, 20%) as a white solid; LRMS for C16H17Br2ClN2O2 (M+H) m/z=465. Molecular Weight=464.5871; Exact Mass=461.9345

المصدر