Patents by Inventor Chunrui YU

Chunrui YU has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • METHOD FOR PREPARING INTERMEDIATE OF URACIL COMPOUND CONTAINING ISOXAZOLINE
    Publication number: 20230265084
    Abstract: A method for preparing an intermediate of a uracil compound containing isooxazoline includes the steps of: making 3-amino-4,4,4-trifluorocrotonic acid methyl ester react with substituted aryl carbamate; in a reaction process, continuously evaporating water and byproduct alcohol in the system; and conducting processing to obtain the intermediate of the uracil compound containing isooxazoline. Using this method the selectivity of the reaction and the utilization rate of raw materials are improved; the hydrolysis products, impurities and tar are reduced; the reaction time is greatly shortened; and the productivity is improved. After one recrystallization of crude products, an intermediate product with purity of more than 97% can be obtained, and quantitative yield can be more than 85%.
    Type: Application
    Filed: June 30, 2021
    Publication date: August 24, 2023
    Inventors: Enming WU, Gongxin WU, Chunrui YU, Qiao WU, Jichun YANG, Yanming YE, Fuqiang YU, Youren XUE, Aiying GUAN
  • METHOD FOR PREPARING ISOXAZOLINE-CONTAINING URACIL COMPOUND THROUGH METHYLATION
    Publication number: 20210387974
    Abstract: A method for preparing an isoxazoline-containing uracil compound involves methylation.
    Type: Application
    Filed: September 25, 2019
    Publication date: December 16, 2021
    Inventors: Enming WU, Yanming YE, Chunrui YU, Fuqiang YU, Youren XUE, Jichun YANG, Qiao WU, Liping BAI, Aiying GUAN