Reaktion #1869311

Reaktionsgleichung

butyryl chloride

5-amino-3-methylisothiazole-4-carbonitrile

NEt3

→

N-(4-cyano-3-methyl-isothiazol-5-yl)-butyramide

Ausbeute 95.0%

Lösungsmittel

DCM

DCM

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.ADDITIONAfter the completion of the addition the reaction mixture
2. 2
   WaschenThe reaction mixture was washed with water (100 mL), 1N HCl (100 mL), brine (200 mL)
3. 3
   Trocknendried over Na2SO4
4. 4
   SonstigeConcentration of the DCM layer provided the crude product which
5. 5
   Sonstigewas triturated from DCM/hexanes ( 1/10)
6. 6
   Filtrationfiltered off

Vorschrift

To a solution of 5-amino-3-methylisothiazole-4-carbonitrile (method 4) (5.31 g, 38.2 mmol) in DCM (200 mL) at 0° C., NEt3 (5 g, 50 mmol) was added followed by the dropwise addition of a solution of the butyryl chloride (4.88 g, 45.8 mmol) in DCM (50 mL). After the completion of the addition the reaction mixture was allowed to warm to r.t. and stirred overnight. The reaction mixture was washed with water (100 mL), 1N HCl (100 mL), brine (200 mL) and dried over Na2SO4. Concentration of the DCM layer provided the crude product which was triturated from DCM/hexanes ( 1/10) and filtered off to isolate the pure N-(4-cyano-3-methyl-isothiazol-5-yl)-butyramide (7.57 g, 95%) as an orange solid.

Quelle