Reaktion #1786

Reaktionsgleichung

2-isopropyl-3-chloromethylpyridine

m-chloroperbenzoic acid

→

2-isopropyl-3-chloromethylpyridine-N-oxide

Lösungsmittel

CHCl3

Reaktionsbedingungen

Aufarbeitung

1. 1
   ExtraktionThe solution was extracted with saturated aqueous sodium bicarbonate (2×5 mL)
2. 2
   TrocknenThe organic phase was dried with MgSO4
3. 3
   Filtrationfiltered
4. 4
   Sonstigethe solvent removed under reduced pressure
5. 5
   SonstigeThe residue was chromatographed on silica gel
6. 6
   WaschenMeOH and eluted with same
7. 7
   Sonstigethe solvent removed under reduced pressure

Vorschrift

The 2-isopropyl-3-hydroxymethylpyridine (240 mg, 1.59 mmol) was dissolved in CH2Cl2 (15 mL) and cooled under nitrogen to 0° C. and thionyl chloride (1.0 mL) was slowly added and the reaction was stirred for 3 hours. The solvent was removed under reduced pressure and the residue was partitioned between CH2Cl2 and saturated sodium bicarbonate. The organic layer was dried with MgSO4, filtered and the solvent removed under reduced pressure to give the desired 2-isopropyl-3-chloromethylpyridine. The 2-isopropyl-3-chloromethylpyridine (65 mg, 0.383 mmol) was dissolved in CHCl3 (10 mL) and cooled under nitrogen to 0° C. and m-chloroperbenzoic acid (55%, 150 mg) was added in small portions. The reaction was stirred for 2 hours. The solution was extracted with saturated aqueous sodium bicarbonate (2×5 mL). The organic phase was dried with MgSO4, filtered, and the solvent removed under reduced pressure. The residue was chromatographed on silica gel packed in 99:1 CH2Cl2 :MeOH and eluted with same. The appropriate fractions were combined and the solvent removed under reduced pressure to give the desired 2-isopropyl-3-chloromethylpyridine-N-oxide.

Quelle