Reacción #430929

Ecuación de reacción

ammonia

water

2-methoxycarbonyl-3-methyl-4-nitrobenzenesulfonyl chloride

→

4-Methyl-5-nitro-1,1,3-trioxo-2,3-dihydro-1λ6 benz[d]isothiazole

Disolventes

tetrahydrofuran

Condiciones de reacción

Tratamiento posterior

1. 1
   Concentraciónthe mixture is concentrated on a rotary evaporator in order
2. 2
   Otroto remove water and THF
3. 3
   workup.STIRRINGThe residue which remains is stirred with ethyl acetate
4. 4
   Filtraciónfiltered off with suction
5. 5
   Lavadowashed with ethyl acetate
6. 6
   OtroAfter drying under reduced pressure, 34 g (0.131 mol)=79% of theory of a white solid of m.p.: 312° C. (dec.)
7. 7
   Otroare obtained

Procedimiento

104 ml of 25 percent ammonia solution are initially taken, 100 ml of water are added and a solution of 48.7 g (0.166 mol) of 2-methoxycarbonyl-3-methyl-4-nitrobenzenesulfonyl chloride in 70 ml of tetrahydrofuran is then added dropwise at 10° C. After stirring at 25° C. for three hours, the mixture is concentrated on a rotary evaporator in order to remove water and THF. The residue which remains is stirred with ethyl acetate, filtered off with suction and washed with ethyl acetate. After drying under reduced pressure, 34 g (0.131 mol)=79% of theory of a white solid of m.p.: 312° C. (dec.) are obtained.

Fuente