METHYL 4-IODO-2-[N-(N-ALKYLAMINOCARBONYL)AMINOSULFONYL]BENZOATE AND DERIVATIVES THEREOF, AND A PROCESS FOR THEIR PREPARATION

摘要

The invention relates to compounds of the formula (I) (see formula I) in which R = (subst.) alkyl or (subst.) cycloalkyl, which are suitable as intermediates for preparing herbicidal sulfonylureas. According to the invention, the compounds (I) are prepared by (a) diazotizing a compound of the formula (II) (see formula II) in the presence of an acid H+X-, where X- is an equivalent of an anion, to give the novel compounds (diazonium salts) of the formula (III) (see formula III) (b) reacting the compound of the formula (III) in the presence of iodide ions to give the compound (IV) and (c) reacting the compound of the formula (IV) with an isocyanate of the formula (V) R-N=C=O ~~~(V) in which R is as defined in formula (I), to give the compound of the formula (I).