Reaktion #473668

Reaktionsgleichung

lithium hydroxide

Pyridine

3-(4-chloro-benzylamino)-phenol

1-methylpyrazole-3-sulfonyl chloride

→

solid

Ausbeute 77.6%

1-Methyl-1H-pyrazole-3-sulfonic acid (4-chloro-benzyl)-(3-hydroxy-phenyl)-amide

Ausbeute 77.6%

Lösungsmittel

dichloromethane

Reaktionsbedingungen

Aufarbeitung

1. 1
   Sonstigequenched with water (50 ml)
2. 2
   ExtraktionThe reaction was extracted with dichloromethane (3×25 ml)
3. 3
   Waschenwashed with water (50 ml) and brine (50 ml)
4. 4
   Trocknendried over anhydrous sodium sulphate
5. 5
   Einengenconcentrated in vacuo
6. 6
   workup.DISSOLUTIONThe crude product was dissolved in a solution of tetrahydrofuran/methanol/water (1:1:1) (25 ml)
7. 7
   workup.STIRRINGthe mixture was stirred at 85° C. for 2 hours
8. 8
   TemperaturThe reaction was cooled
9. 9
   Sonstigequenched with 2M hydrochloric acid (aq) until slightly acidic and
10. 10
    Extraktionextracted with ethyl acetate (2×50 ml)
11. 11
    Waschenwashed with water (100 ml)
12. 12
    Trocknendried over anhydrous sodium sulphate
13. 13
    Einengenconcentrated in vacuo

Vorschrift

Pyridine (520 μl, 6.4 mmol) was added to a stirred solution of 3-(4-chloro-benzylamino)-phenol (500 mg, 2.2 mmol) and 1-methylpyrazole-3-sulfonyl chloride (181 mg, 4.5 mmol) in anhydrous dichloromethane (22 ml). The reaction was stirred under nitrogen at 50° C. for 48 hours and then quenched with water (50 ml). The reaction was extracted with dichloromethane (3×25 ml), and the organics combined, washed with water (50 ml) and brine (50 ml), dried over anhydrous sodium sulphate and then concentrated in vacuo. The crude product was dissolved in a solution of tetrahydrofuran/methanol/water (1:1:1) (25 ml), treated with lithium hydroxide (271 mg, 6.45 mmol) and the mixture was stirred at 85° C. for 2 hours. The reaction was cooled, quenched with 2M hydrochloric acid (aq) until slightly acidic and extracted with ethyl acetate (2×50 ml). The organic extracts were combined, washed with water (100 ml), dried over anhydrous sodium sulphate and concentrated in vacuo to obtain a white solid (645 mg, 27% yield). HPLC retention time 5.59 min Mass spectrum (ES+) m/z 378 (M+H).

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