申请人:Hoechst Schering AgrEvo GmbH
公开号:US06147248A1
公开(公告)日:2000-11-14
The invention relates to compounds of the formula (I) ##STR1## 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) ##STR2## in the presence of an acid H.sup.+ X.sup.-, where X.sup.- is an equivalent of an anion, to give the novel compounds (diazonium salts) of the formula (III) ##STR3## (b) reacting the compound of the formula (III) in the presence of iodide ions to give the compound (IV) and ##STR4## (c) reacting the compound of the formula (IV) with an isocyanate of the formula (V) R--N.dbd.C.dbd.O (V) in which R is as defined in formula (I), to give the compound of the formula (I).
本发明涉及公式(I)的化合物:##STR1##其中R = (取代)烷基或(取代)环烷基,适用于制备除草磺酰脲的中间体。根据本发明,化合物(I)通过以下步骤制备:(a)在酸H.sup.+ X.sup.-存在下重氮化公式(II)的化合物##STR2##其中X.sup.-是阴离子的当量,得到公式(III)的新化合物(重氮盐)##STR3##(b)在碘化物离子存在下反应公式(III)得到化合物(IV)和##STR4##(c)将公式(V)R-N.dbd.C.dbd.O(V)中的异氰酸酯与公式(IV)的化合物反应,其中R如公式(I)所定义,得到公式(I)的化合物。