申请人:Shenyang Sinochem Agrochemicals R&D Co.,Ltd.
公开号:US20220055996A1
公开(公告)日:2022-02-24
Provided are a method of preparing a malononitrile oxime ether compound and an intermediate compound. The malononitrile oxime ether compound has a structure as shown in formula (VII), wherein W is selected from aryl or heteroaryl. The preparation method comprises steps: reacting a first raw material with a second raw material in the presence of a first solvent and a catalyst to obtain the intermediate compound, wherein the first raw material has a structure as shown in formula (IV), and the second raw material has a structure as shown in formula (V); and subjecting the intermediate compound as shown in formula (VI), and, a dehyclrant to a dehydrantion reaction in the presence of a second solvent to obtain the malononitrile oxime ether compound. In the preparation process for the intermediate, a cheaper cyanoacetamide is used as a raw material, the reaction conditions are mild. Moreover, the yield of the intermediate compound is high and the cost of the process is low. Furthermore, the required malononitrile oxime ether compound, is obtained only through one-step dehydration reaction. Using the preparation method, is advantageous for improving the yield of malononitrile oxime ethers and reducing the cost of the process.
提供了一种制备马隆二腈肟醚化合物和中间体的方法。马隆二腈肟醚化合物的结构如公式(VII)所示,其中W选择自芳基或杂环芳基。制备方法包括步骤:在第一溶剂和催化剂存在下,将第一原料与第二原料反应,得到中间体化合物,其中第一原料的结构如公式(IV)所示,第二原料的结构如公式(V)所示;并将中间体化合物如公式(VI)和脱水剂在第二溶剂存在下进行脱水反应,得到马隆二腈肟醚化合物。在中间体的制备过程中,使用了成本较低的氰乙酰胺作为原料,反应条件温和。此外,中间体化合物的产率高,工艺成本低。此外,所需的马隆二腈肟醚化合物仅通过一步脱水反应获得。使用该制备方法有助于提高马隆二腈肟醚化合物的产率并降低工艺成本。