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:
Oct. 22, 2002
Filed:
May. 02, 2001
Prabhakar Chebiyyam, Hyderabad, IN;
Rajender Kumar Potlapally, Hyderabad, IN;
Chinna Bakki Reddy Gade, Hyderabad, IN;
Balaram Mahanti Satish, Hyderabad, IN;
Ramabhadra Sarma Mamillapalli, Hyderabad, IN;
Om Reddy Gaddam, Hyderabad, IN;
Dr. Reddy's Research Foundation, Andhra Pradesh, IN;
Abstract
An improved process for the preparation of 5-[4-[[3-Methyl-4-oxo-3,4-dihydroquinazolin-2-yl]methoxy]benzyl]thiazolidine-2,4-dione of formula (1) which comprises: reducing the compound of formula (2′) where R represents a (C -C )alkyl group using Raney Nickel or Magnesium in alcohol having 1 to 4 carbon atoms or mixtures thereof, if desired reesterifying using sufphuric acid at a temperature in the range of 0° C. to 60° C. to obtain a compound of formula (3′) wherein R is as defined above, hydrolyzing the compound of formula (3′) wherein R is as defined above, by conventional methods to obtain the acid of formula (4), condensing the acid of formula (4) with N-methyl anthranilamide directly without any preactivation of the acid to produce the compound of formula (1) and if desired, converting the compound of formula (1) to pharmaceutically acceptable salts thereof by conventional methods.