Réaction #430929

Équation de réaction

ammonia

water

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

→

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

Solvants

tetrahydrofuran

Conditions de réaction

Traitement

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

Mode opératoire

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.

Source