Methyl...

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C - Chemistry, Metallurgy

07

C

C07C 311/59 (2006.01) C07C 303/40 (2006.01) C07C 311/16 (2006.01) C07C 311/37 (2006.01) C07C 311/58 (2006.01) C07C 323/43 (2006.01)

Patent

CA 2259216

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).

L'invention concerne des composés de formule (I), dans laquelle R représente alkyle (substitué) ou cycloalkyle (substitué), qui conviennent comme produits intermédiaires pour la fabrication de sulfonylurées herbicides. Pour préparer les composés (I), a) on diazote, en présence d'un acide H<+>X<->, où X<-> représente l'équivalent d'un anion, un composé de formule (II), de façon à obtenir de nouveaux composés (sels de diazonium) de formule (III), b) fait réagir le composé de formule (III) en présence d'ions iodure, de façon à obtenir un composé de formule (IV), et c) on fait réagir le composé de formule (IV) avec un isocyanate de formule (V) R - N = C = O, dans laquelle R est défini comme dans la formule (I), de façon à obtenir ledit composé de formule (I).

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