申请人:Reanal Finomvegyszergyar
公开号:US04410697A1
公开(公告)日:1983-10-18
The invention relates to a new method for the preparation of N-aryl-N'-(mono- or disubstituted)-urea derivatives having the general formula (I), ##STR1## wherein Aryl is an optionally substituted phenyl group, and R.sup.1 and R.sup.2 each stand for an optionally substituted alkyl, cycloalkyl, alkoxy or phenyl group, or R.sup.1 and R.sup.2 may form, together with the adjacent nitrogen atom, a nitrogen-containing heterocyclic group which may contain a further hetero atom, or one of R.sup.1 and R.sup.2 may also stand for hydrogen, with the proviso that if one of R.sup.1 and R.sup.2 is an optionally substituted phenyl group, the other may represent only hydrogen atom or an optionally substituted alkyl or alkoxy group, by reacting a carbamate of the general formula (II) with an amine of the general formula (III), R.sup.1 R.sup.2 N--CO--X (II) Aryl--NH.sub.2 (III) or a carbamate of the general formula (IV) with an amine of the general formula (V), Aryl--NH--CO--X (IV) R.sup.1 R.sup.2 NH (V) wherein R.sup.1, R.sup.2 and Aryl are as defined above and X is a lower alkoxy, phenoxy or substituted phenoxy group, in the presence of a tertiary amine catalyst. According to the invention a tertiary alkylamine containing altogether at least 6 carbon atoms and minimum one alkyl chain with at least 4 carbon atoms or a mixture of such tertiary alkylamines is applied as catalyst.
该发明涉及一种制备N-芳基-N'-(单取代或双取代)-脲衍生物的新方法,其具有通用式(I),其中Aryl是一个可选取代的苯基团,R.sup.1和R.sup.2分别代表一个可选取代的烷基、环烷基、烷氧基或苯基团,或者R.sup.1和R.sup.2可以与相邻的氮原子一起形成含氮杂环基团,该基团可能含有进一步的杂原子,或者R.sup.1和R.sup.2中的一个也可以代表氢原子,但前提是如果R.sup.1和R.sup.2中的一个是可选取代的苯基团,则另一个可能代表仅为氢原子或一个可选取代的烷基或烷氧基团,通过将通用式(II)的氨基甲酸酯与通用式(III)的胺反应,其中R.sup.1 R.sup.2 N--CO--X (II) Aryl--NH.sub.2 (III) 或将通用式(IV)的氨基甲酸酯与通用式(V)的胺反应,Aryl--NH--CO--X (IV) R.sup.1 R.sup.2 NH (V)其中R.sup.1、R.sup.2和Aryl如上定义,X是一个低烷氧基、苯氧基或取代苯氧基团,在三级胺催化剂的存在下。根据该发明,至少含有总共至少6个碳原子和至少一个至少含有4个碳原子的烷基链的三级烷基胺或这类三级烷基胺的混合物被应用作为催化剂。