Reaktion #85548

Reaktionsgleichung

NH4Cl

n-BuLi

3-bromopyridine

2-benzothiazol-2-yl-3,3-bismethylsulfanylacrylonitrile

3-pyridinyl lithium

→

desired product

Ausbeute 65.0%

4-Benzothiazol-2-yl-5-pyridin-3-yl-1H-pyrazol-3-ylamine

Ausbeute 65.0%

Lösungsmittel

cyclohexane

ether

THF

THF

Reaktionsbedingungen

Aufarbeitung

1. 1
   Sonstigewas prepared
2. 2
   Temperaturslowly warmed up to room temperature
3. 3
   workup.STIRRINGstirred at that temperature for 2 hours
4. 4
   SonstigeUpon completion of the reaction
5. 5
   ExtraktionThe aqueous phase was extracted with ethyl acetate
6. 6
   WaschenThe organic phase was washed with brine
7. 7
   Trocknendried over magnesium sulfate
8. 8
   Filtrationfiltered
9. 9
   Sonstigeevaporated
10. 10
    SonstigeThe crude material was then purified by flash chromatography
11. 11
    Wascheneluting with CH2Cl2

Vorschrift

A yellow suspension of 3-pyridinyl lithium in THF was prepared according to the literature (Cama, L. D.; Wildonger, K. J.; Guthikonda, R.; Ratcliffe, R. W.; Christensen, B. G. Tetrahedron (1983), 39, 2531) by adding n-BuLi (0.25 mL of a 2 M solution in cyclohexane, 0.5 mmol) to a solution of 3-bromopyridine (87 mg, 0.5 mmol) in anhydrous ether (3 mL) at −78° C. To this slurry was rapidly added 2-benzothiazol-2-yl-3,3-bismethylsulfanylacrylonitrile (140 mg, 0.5 mmol) in anhydrous THF (5 mL) under argon. The resulting mixture was stirred at −78° C. for 1 hour, and then slowly warmed up to room temperature and stirred at that temperature for 2 hours. Upon completion of the reaction, the mixture was poured into a saturated NH4Cl aqueous solution. The aqueous phase was extracted with ethyl acetate. The organic phase was washed with brine, dried over magnesium sulfate, filtered and evaporated. The crude material was then purified by flash chromatography eluting with CH2Cl2:MeOH=1:0-19:1 to yield 100 mg (65%) of the desired product as a brown oil. MS (m/z, ES+): 310 (M+1, 25%), 263 (M−46, 100%).

Quelle