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:
Mar. 07, 1978
Filed:
Feb. 22, 1977
Alan Charles Barnes, Swindon, EN;
Peter Wilfred Hairsine, Swindon, EN;
Peter John Ramm, Swindon, EN;
John Bodenham Taylor, Down Ampney, near Cirencester, EN;
Roussel UCLAF, Paris, FR;
Abstract
Novel xanthone-2-carboxylic acid compounds of the formula ##STR1## wherein A is selected from the group consisting of --COOR', a 1H-tetrazol-5-yl and a 1H-tetrazolylcarbamoyl, R' is selected from the group consisting of hydrogen, alkyl of 1 to 5 carbon atoms and cation of a non-toxic, pharmaceutically acceptable organic or inorganic base, R is selected from the group consisting of hydrogen, alkyl of 1 to 9 carbon atoms, alkoxy of 1 to 9 carbon atoms and alkoxy alkoxy of 2 to 9 carbon atoms and X is selected from the group consisting of ##STR2## AND ##STR3## WHEREIN R.sub.1 is alkyl of 1 to 5 carbon atoms, R.sub.2 is selected from the group consisting of hydrogen, acyl of an aliphatic acid of 1 to 5 carbon atoms, aroyl of 7 to 8 carbon atoms, araliphatic acyl with 1 to 5 carbon atoms in the aliphatic portion and 6 or 7 carbon atoms in the aryl portion, aralkyl of 7 to 8 carbon atoms, arylsulfonyl, a carbamoyl, a carboxyalkyl of 1 to 5 carbon atoms, --CO--(CH.sub.2).sub.n -- Het where n is 1,2 or 3 and Het is a N-attached nitrogen heterocyclic which may contain an additional heteroatom and ##STR4## AND Alk is alkyl of 1 to 5 carbon atoms and R.sub.3 is arylsulfonyl which possess anti-allergic properties and their preparation.