Method for the production of sulphamic acid halogenides

A process for preparing compounds of the general formula IV

• where n is 0 or 1, Het is an optionally substituted 5- or 6-membered heterocycle which may have 1, 2 or 3 nitrogen atoms, optionally one further heteroatom selected from oxygen and sulfur, and optionally one or two carbonyl or thiocarbonyl groups as ring members, Ra is hydrogen, fluorine or chlorine, Rb is chlorine or cyano, and A is a radical derived from a primary or secondary amine A1, comprising the following steps:
• i) reacting a primary or secondary amine A1 with at least equimolar amounts of SO3 or an SO3 source in the presence of at least equimolar amounts of a tertiary amine A2, based in each case on the amine A1, to obtain an ammonium sulfamate;
• ii) reacting the ammonium sulfamate with at least the amount of a phosphorus halide required by the stoichiometry, to obtain a sulfamoyl halide of the amine A1;
• iii) reacting the sulfamoyl halide obtained in step ii) with ammonia to obtain a sulfamoyl amide;
• and
• iv) reacting the reaction product from step iii) with a compound of the general formula V
• where Het, n, Ra and Rb are each as defined for formula IV and Y is OH, alkoxy or a halogen atom.