申请人:Bayer Aktiengesellschaft
公开号:US05599945A1
公开(公告)日:1997-02-04
Alkoxytriazolinones of the formula (I), ##STR1## in which R.sup.1 and R.sup.2 independently of one another represent in each case optionally substituted alkyl, alkenyl, alkinyl, cycloalkyl, cycloalkylalkyl, aryl or arylalkyl, (which can be used as intermediates for the preparation of herbicidal active compounds) are obtained in good yields and in high purity by reacting iminocarbonic diesters (II) with carbazinic esters (III) ##STR2## in which R.sup.2 and R.sup.3 in each case represent, for example, alkyl or aryl, at -20.degree. C. to +120.degree. C. (1st step) and subjecting the semicarbazide derivatives (IV) formed in this process with elimination of R.sup.2 --OH ##STR3## to a cyclizing condensation reaction in the presence of a base at 20.degree. C. to 150.degree. C. with elimination of R.sup.3 --OH, if appropriate (2nd step) and, finally, by reacting the resulting 5-alkoxytriazolinones of the formula (V) with an alkylating agent of the formula R.sup.1 --X (VI) at 0.degree. C. to 150.degree. C., if appropriate in the presence of a base (3rd step: highly selective 4-alkylation).
根据公式(I)的Alkoxytriazolinones,其中R.sup.1和R.sup.2分别独立地表示每种情况下可选择地取代的烷基、烯基、炔基、环烷基、环烷基烷基、芳基或芳基烷基(可用作除草活性化合物的中间体),通过将亚胺碳酸二酯(II)与卡巴嗪酯(III)反应获得良好收率和高纯度##STR1##在此过程中形成的半卡巴嗪衍生物(IV)在碱存在下通过消除R.sup.2-OH进行环化缩合反应,消除R.sup.3-OH,如果需要(第2步),最后通过将得到的公式(V)的5-烷氧基三唑酮与公式R.sup.1-X(VI)的烷基化试剂在0°C至150°C下反应,必要时在碱存在下进行(第3步:高度选择性的4-烷基化)。