Patents by Inventor Pei Juan Chua

Pei Juan Chua 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).

  • Patent number: 8940938
    Abstract: Disclosed is a process of carrying out a Michael reaction with recovery of the catalyst, where a compound of formula (1): is reacted with a compound of formula (2): in the presence of a catalyst of formula (4): where the compounds of formulae (1) and (2) undergo a Michael reaction.
    Type: Grant
    Filed: May 18, 2010
    Date of Patent: January 27, 2015
    Assignee: Nanyang Technological University
    Inventors: Guofu Zhong, Bin Tan, Xuan Zhang, Pei Juan Chua
  • Publication number: 20140228564
    Abstract: Disclosed is a process of enantioselectively forming an aminoxy compound of Formula (3) In formula (3) R1 is one of an aliphatic group and an alicyclic group. R2 is one of hydrogen, an aliphatic group, an alicyclic group, an aromatic group, an arylaliphatic group and an arylalicyclic group. R3 is one of hydrogen, halogen, hydroxyl, and an aliphatic group with a main chain having 1 to about 10 carbon atoms. The respective aliphatic, alicyclic, aromatic, arylaliphatic or arylalicyclic groups of R1, R2, and R3 comprise 0 to about 3 heteroatoms independently selected from the group consisting of N, O, S, Se and Si. The process includes contacting a carbonyl compound of Formula (1) and a nitroso compound of Formula (2) in the presence of a chiral catalyst.
    Type: Application
    Filed: February 5, 2014
    Publication date: August 14, 2014
    Applicant: Nanyang Technological University
    Inventors: Guofu ZHONG, Min LU, Di ZHU, Pei Juan CHUA, Bin TAN
  • Patent number: 8754252
    Abstract: Disclosed are processes of forming a compound (33), (35) or (37)
    Type: Grant
    Filed: July 3, 2012
    Date of Patent: June 17, 2014
    Assignee: Nanyang Technological University
    Inventors: Guofu Zhong, Bin Tan, Pei Juan Chua, Zugui Shi
  • Patent number: 8680335
    Abstract: Disclosed is a process of enantioselectively forming an aminoxy compound of Formula (3) In formula (3) R1 is one of an aliphatic group and an alicyclic group. R2 is one of hydrogen, an aliphatic group, an alicyclic group, an aromatic group, an arylaliphatic group and an arylalicyclic group. R3 is one of hydrogen, halogen, hydroxyl, and an aliphatic group with a main chain having 1 to about 10 carbon atoms. The respective aliphatic, alicyclic, aromatic, arylaliphatic or arylalicyclic groups of R1, R2, and R3 comprise 0 to about 3 heteroatoms independently selected from the group consisting of N, O, S, Se and Si. The process includes contacting a carbonyl compound of Formula (1) and a nitroso compound of Formula (2) in the presence of a chiral catalyst.
    Type: Grant
    Filed: May 18, 2010
    Date of Patent: March 25, 2014
    Assignee: Nanyang Technological University
    Inventors: Guofu Zhong, Min Lu, Di Zhu, Pei Juan Chua, Bin Tan
  • Publication number: 20130096338
    Abstract: Disclosed are processes of forming a compound (33), (35) or (37)
    Type: Application
    Filed: July 3, 2012
    Publication date: April 18, 2013
    Applicant: Nanyang Technological University
    Inventors: Guofu Zhong, Bin Tan, Pei Juan Chua, Zugui Shi
  • Patent number: 8273901
    Abstract: Disclosed is a process of forming a pyrrole compound. The process comprises contacting an ?-carbonyl oxime compound 1 and an ?,?-unsaturated aldehyde 2 R1 and R2 in compound 1 are independently selected from the group consisting of H, a silyl-group, an aliphatic group, an alicyclic group, an aromatic group, an arylaliphatic group, and an arylalicyclic group. The aliphatic, alicyclic, aromatic, arylaliphatic, and arylalicyclic groups comprise 0 to about 3 heteroatoms selected from the group N, O, S, Se and Si. R3 in aldehyde 2 is selected from the group consisting of H, a silyl-group, an aliphatic group, an alicyclic group, an aromatic group, an arylaliphatic group, and an arylalicyclic group. The aliphatic, alicyclic, aromatic, arylaliphatic, and arylalicyclic groups comprise 0 to about 3 heteroatoms selected from the group N, O, S, Se and Si. The ?-carbonyl oxime compound 1 an the ?,?-unsaturated aldehyde 2 are contacted in a suitable solvent in the presence of a secondary amine.
    Type: Grant
    Filed: May 18, 2010
    Date of Patent: September 25, 2012
    Assignee: Nanyang Technical University
    Inventors: Guofu Zhong, Bin Tan, Zugui Shi, Pei Juan Chua
  • Publication number: 20120004424
    Abstract: Disclosed is a process of carrying out a Michael reaction with recovery of the catalyst, where a compound of formula (1): is reacted with a compound of formula (2): in the presence of a catalyst of formula (4): where the compounds of formulae (1) and (2) undergo a Michael reaction.
    Type: Application
    Filed: May 18, 2010
    Publication date: January 5, 2012
    Applicant: NANYANG TECHNOLOGICAL UNIVERSITY
    Inventors: GUOFU ZHONG, BIN TAN, XUAN ZHANG, PEI JUAN CHUA
  • Publication number: 20110224429
    Abstract: Disclosed is a process of enantioselectively forming an aminoxy compound of Formula (3) In formula (3) R1 is one of an aliphatic group and an alicyclic group. R2 is one of hydrogen, an aliphatic group, an alicyclic group, an aromatic group, an arylaliphatic group and an arylalicyclic group. R3 is one of hydrogen, halogen, hydroxyl, and an aliphatic group with a main chain having 1 to about 10 carbon atoms. The respective aliphatic, alicyclic, aromatic, arylaliphatic or arylalicyclic groups of R1, R2, and R3 comprise 0 to about 3 heteroatoms independently selected from the group consisting of N, O, S, Se and Si. The process includes contacting a carbonyl compound of Formula (1) and a nitroso compound of Formula (2) in the presence of a chiral catalyst.
    Type: Application
    Filed: May 18, 2010
    Publication date: September 15, 2011
    Applicant: Nanyang Technological University
    Inventors: Guofu Zhong, Min Lu, Di Zhu, Pei Juan Chua, Bin Tan
  • Publication number: 20110124881
    Abstract: Disclosed is a process of forming a pyrrole compound. The process comprises contacting an ?-carbonyl oxime compound 1 and an ?,?-unsaturated aldehyde 2 R1 and R2 in compound 1 are independently selected from the group consisting of H, a silyl-group, an aliphatic group, an alicyclic group, an aromatic group, an arylaliphatic group, and an arylalicyclic group. The aliphatic, alicyclic, aromatic, arylaliphatic, and arylalicyclic groups comprise 0 to about 3 heteroatoms selected from the group N, O, S, Se and Si. R3 in aldehyde 2 is selected from the group consisting of H, a silyl-group, an aliphatic group, an alicyclic group, an aromatic group, an arylaliphatic group, and an arylalicyclic group. The aliphatic, alicyclic, aromatic, arylaliphatic, and arylalicyclic groups comprise 0 to about 3 heteroatoms selected from the group N, O, S, Se and Si. The ?-carbonyl oxime compound 1 an the ?,?-unsaturated aldehyde 2 are contacted in a suitable solvent in the presence of a secondary amine.
    Type: Application
    Filed: May 18, 2010
    Publication date: May 26, 2011
    Inventors: Guofu Zhong, Bin Tan, Zugui Shi, Pei Juan Chua
  • Publication number: 20100298576
    Abstract: Disclosed are processes of forming a compound (33), (35) or (37)
    Type: Application
    Filed: May 18, 2010
    Publication date: November 25, 2010
    Inventors: Guofu ZHONG, Bin Tan, Pei Juan Chua, Zugui Shi