Reacción #5935

Ecuación de reacción

(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

Rendimiento 58.7%

Disolventes

ethanol water

Condiciones de reacción

Tratamiento posterior

1. 1
   Temperaturathe mixture is refluxed for 30 minutes
2. 2
   Extracciónthe mixture is extracted with ethyl acetate
3. 3
   LavadoThe ethyl acetate layer is washed with water and saline
4. 4
   Secadodried over sodium sulfate
5. 5
   workup.DISTILLATIONdistilled
6. 6
   Otroto remove the solvent
7. 7
   OtroThe residue is purified by silica gel column chromatography (CHCl3)
8. 8
   Otrorecrystallized from ethyl acetate-hexane twice

Procedimiento

(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%).

Fuente