Acetic Acid → methyl 4-amino-2-(N-tert-butylsulfamoyl)benzoate

Participants

Reaction Conditions

Reaction Steps

50.0 g (0.158 mol) of methyl 2-(N-tert-butylsulfamoyl)-4-nitrobenzoate (prepared according to DE-OS 4 236 902) are added to a mixture of 180 ml of acetic acid and 75 ml of water, and the mixture is heated to 80° C. 26.5 g (0.474 mol) of iron powder are added a little at a time in such a manner that the temperature does not rise above 85° C. The mixture is subsequently stirred at 80° C. for 4 h, 85 ml of 2N HCl are added at this temperature and the mixture is allowed to cool to 25° C. The mixture is filtered off and the solid is washed thoroughly with water. The solid is subsequently 3× extracted hot with in each case 250 ml of ethyl acetate. The ethyl acetate phase is evaporated, and the residue is triturated with diisopropyl ether and dried. This gives 37.7 g (83% of theory) of methyl 4-amino-2-(N-tert-butylsulfamoyl)benzoate of m.p. 198-1990° C.

Provenance & Evidence