Patents by Inventor Guangling Yu

Guangling 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).

  • RESOLUTION OF 4,5-DIMETHOXY-1-(METHYLAMINOMENTHYL)-BENZOCYCLOBUTANE
    Publication number: 20120004463
    Abstract: A method of resolving an important chemical intermediate, 4,5-dimethoxy-1-(methylaminomethyl)-benzocyclobutane, comprises the following steps: reacting its two enantiomers of 4,5-dimethoxy-1-(methylaminomethyl)-benzocyclobutane with di-p-toluoyl-L-tartaric acid (LDTTA) or di-p-toluoyl-D-tartaric acid (DDTTA) in an alcoholic solution or an alcohol in water solution to give the corresponding salts, and then resolving the salts. This method gives high enantiomer excess value, high yield which is more than 80% in total with normal resolution and reverse resolution.
    Type: Application
    Filed: October 10, 2008
    Publication date: January 5, 2012
    Inventors: Piaoyang Sun, Yongjiang Chen, Guangling Yu