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. 08, 1991
Filed:
Apr. 30, 1990
Shigeru Nishimoto, Minoo, JP;
Akio Nakao, Osaka, JP;
Yasuji Ikeda, Kyoto, JP;
Hiroyuki Nate, Higashiosaka, JP;
Tanabe Seiyaku Co., Ltd., Osaka, JP;
Abstract
There is disclosed a process for preparing 1,5-benzothiazepine derivatives represented by the formula: ##STR1## wherein one of R.sup.1 and R.sup.2 is a lower alkyl group or halogen atom, and the other is hydrogen atom, R.sup.3 is a lower alkyl group or a lower alkoxy group, which comprises subjecting a propionic acid compound represented by the formula (II): ##STR2## wherein R.sup.1, R.sup.2 and R.sup.3 have the same meanings as defined above, and R.sup.4 represents hydrogen atom or an ester residue, to intramolecular ring closing reaction in the presence of a sulfonic acid compound represented by the formula (III):