The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 22, 2026
Filed:
Mar. 10, 2021
Applicant:
Soochow University, Suzhou, CN;
Inventors:
Assignee:
SOOCHOW UNIVERSITY, Suzhou, CN;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D 491/052 (2006.01); B01J 31/18 (2006.01); B01J 31/22 (2006.01);
U.S. Cl.
CPC ...
C07D 491/052 (2013.01); B01J 31/1805 (2013.01); B01J 31/2208 (2013.01); B01J 2231/48 (2013.01); B01J 2531/0205 (2013.01); B01J 2531/11 (2013.01); B01J 2531/37 (2013.01); B01J 2531/38 (2013.01);
Abstract
A method for the reaction of an isatin and cyclopropenone compound at low catalytic amount. In the presence of an amine compound and phosphite, the isatin and cyclopropenone are reacted in an organic solvent using a silicon amino rare earth compound as a catalyst to synthesize pyrano[2,3-b]indol-2-one compounds. In the reaction above, the amount of catalyst is few, and noble metal is not needed for catalysis. The present method can achieve preparation of the pyrano[2,3-b]indol-2-one compound efficiently and simply.
Xu, Fan. (2026). Method for carrying out reaction of isatin compound and cyclopropenone compound at low catalytic amount (U.S. Patent No. 12741972). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/12741972
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile