Reacción #9966

Ecuación de reacción

6-Amino-5-fluoro-2-methylbenzoxazole

sulfuryl chloride

→

6-Amino-7-Chloro-5-Fluoro-2-Methylbenzoxazole

Disolventes

ethyl acetate

ethyl acetate

methylene chloride

methylene chloride

Condiciones de reacción

Tratamiento posterior

1. 1
   workup.ADDITIONcontaining
2. 2
   Otrodry pryidine (5.8 mL, 72.22 mMole)
3. 3
   Lavadowashed with 2N-HCl
4. 4
   Secadodried (MgSO4)
5. 5
   Filtraciónfiltered
6. 6
   Concentraciónconcentrated
7. 7
   Otroto give a solid
8. 8
   Otroto give the product

Procedimiento

6-Amino-5-fluoro-2-methylbenzoxazole (12 g, 72.22 mMole) was dissolved in ethyl acetate (100 mL) containing dry pryidine (5.8 mL, 72.22 mMole). At room temperature and with good stirring, sulfuryl chloride (7.0 mL, 86.66 mMole) was added drop by drop over a 20-minute period. After stirring at room temperature for about 30 minutes, the reaction was diluted with ethyl acetate, washed with 2N-HCl, dried (MgSO4), filtered and concentrated to give a solid. This solid was dissolved in methylene chloride and passed through a short column of silica gel eluting with methylene chloride to give the product. Yield 5.0 g.

Fuente