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:
Jan. 03, 1984
Filed:
Jan. 14, 1981
John M Tedder, Redhill, GB;
Beecham Group Limited, , GB;
Abstract
Process for the preparation of compounds of the formula (I): ##STR1## and pharmaceutically acceptable salts thereof wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 which may be the same or different, represent hydrogen, halogen, nitro, lower alkyl or lower alkoxy, where lower means of up to six carbon atoms, or any adjacent two of R.sub.1 to R.sub.4 taken together represent an alkylene group containing from 3 to 5 carbon atoms or a 1,4-buta-1,3-dienylene group, by removal of CH.sub.2 R.sub.5 wherein R.sub.5 is phenyl optionally substituted with one or two groups selected from C.sub.1-4 alkyl, C.sub.1-4 alkoxy, halogen or nitro from a compound of formula (II): ##STR2## with an alkali metal C.sub.1-4 primary alkoxide. The compounds are used to inhibit allergic responses.