Réaction #46128

Équation de réaction

compound

4-cyclopropyl-3,4-dihydro-7-methoxycarbonyl-2H-1,2,4-benzothiadiazine 1,1-dioxide

NaOH

→

title product

7-carboxy-4-cyclopropyl-3,4-dihydro-2H-1,2,4-benzothiadiazine 1,1-dioxide

Solvants

methanol water

Conditions de réaction

Traitement

1. 1
   AutreThe methanol is then removed by distillation under reduced pressure
2. 2
   workup.ADDITIONby adding 6N HCl
3. 3
   AutreThe precipitate obtained
4. 4
   Filtrationis collected by filtration
5. 5
   Lavagewashed with water
6. 6
   Autredried

Mode opératoire

A solution of the compound of Example 77 (3.5 mmol) in a mixture of methanol/water 1/1 (100 mL) containing NaOH (0.5 g) is heated at 40° C. for 3 hours. The methanol is then removed by distillation under reduced pressure and the resulting aqueous solution is adjusted to pH 2 by adding 6N HCl. The precipitate obtained is collected by filtration, washed with water and dried to yield the title product in the form of a white solid.

Source