Реакция #5935

Уравнение реакции

(R)-2-(4-Chlorophenyl)-4-[(S)-N-(2-naphthalenesulfonyl)prolyl]-3,4-dihydro-2H-1,4-benzothiazine

potassium hydroxide

→

(R)-(+)-2-(4-chlorophenyl)-3,4-dihydro-2H-1,4-benzothiazine

Выход 58.7%

Растворители

ethanol water

Условия реакции

Обработка

1. 1
   Температураthe mixture is refluxed for 30 minutes
2. 2
   Экстракцияthe mixture is extracted with ethyl acetate
3. 3
   ПромывкаThe ethyl acetate layer is washed with water and saline
4. 4
   Сушкаdried over sodium sulfate
5. 5
   workup.DISTILLATIONdistilled
6. 6
   Другоеto remove the solvent
7. 7
   ДругоеThe residue is purified by silica gel column chromatography (CHCl3)
8. 8
   Другоеrecrystallized from ethyl acetate-hexane twice

Методика

(R)-2-(4-Chlorophenyl)-4-[(S)-N-(2-naphthalenesulfonyl)prolyl]-3,4-dihydro-2H-1,4-benzothiazine (9.40 g, 0.017 mole) is suspended in ethanol-water (10:1, 188 ml), and thereto is added 86 % potassium hydroxide (11.2 g, 0.172 mole), and the mixture is refluxed for 30 minutes. The reaction mixture is poured into ice water and the mixture is extracted with ethyl acetate. The ethyl acetate layer is washed with water and saline, dried over sodium sulfate and distilled to remove the solvent. The residue is purified by silica gel column chromatography (CHCl3) and thereafter recrystallized from ethyl acetate-hexane twice to give (R)-(+)-2-(4-chlorophenyl)-3,4-dihydro-2H-1,4-benzothiazine (2.61 g, 58%).

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