申请人:Bayer Aktiengesellschaft
公开号:US04528379A1
公开(公告)日:1985-07-09
In a process for the preparation of a substituted thiadiazolyloxyacetamide of the formula ##STR1## in which R.sup.1 and R.sup.2 each independently is hydrogen, alkyl, alkenyl, alkenyl, alkinyl, optionally substituted cycloalkyl or cycloalkenyl, halogenoalkyl, alkoxyalkyl, alkoxy, aralkyl or optionally substituted aryl, or R.sup.1 and R.sup.2, together with the nitrogen atom to which they are bonded, form an optionally substituted heterocyclic structure which can contain further hetero atoms, One of X and Y is a nitrogen atom and the other a C-R.sup.3 a grouping, and R.sup.3 is alkyl, alkoxy, alkylthio, alkylsulphonyl, halogenoalkyl, aralkyl, aralkoxy, aralkythio or optionally substituted aryl, wherein a substituted 5-halogenothiadiazole of the formula ##STR2## in which Hal is halogen, is reacted with a hydroxyacetamide of the formula ##STR3## in the presence of a base as an acid acceptor and, optionally in the presence of a diluent, the improvement which comprises employing lithium hydroxide or its hydrate as the base, and carrying out the reaction at a temperature between about -10.degree. C. and +60.degree. C. The end products are known herbicides.
一种制备式为##STR1##的取代噻二唑氧乙酰胺的方法,其中R.sup.1和R.sup.2各自独立地为氢、烷基、烯基、炔基、可选取代的环烷基或环烯基、卤代烷基、烷氧基、烷氧基、芳基烷基或可选取代的芳基,或R.sup.1和R.sup.2连同它们所结合的氮原子形成一个可选取代的杂环结构,该结构可以包含进一步的杂原子,其中X和Y中的一个是氮原子,另一个是C-R.sup.3基团,R.sup.3是烷基、烷氧基、烷硫基、烷基磺酰基、卤代烷基、芳基烷基、芳基烷氧基、芳基烷硫基或可选取代的芳基,其中式中Hal是卤素,反应一个式为##STR2##的取代5-卤代噻二唑与一个式为##STR3##的羟乙酰胺在碱作为酸受体的存在下反应,可选地在稀释剂的存在下,改进包括采用氢氧化锂或其水合物作为碱,并在-10℃至+60℃之间的温度下进行反应。最终产物是已知的除草剂。