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:
Aug. 29, 1995
Filed:
Feb. 22, 1994
Kiyofumi Ishikawa, Tsukuba, JP;
Takashi Hayama, Tsukuba, JP;
Banyu Pharmaceutical Co., Ltd., Tokyo, JP;
Abstract
This invention relates to novel 6,7-dialkoxy-3,4-dihydroisoquinolin-8-ols, a process for preparing the 6,7-dialkoxy-3,4-dihydroisoquinolin-8-ols reioselectively and in a high yield utilizing the Bischler-Napieralski reaction, a process for synthesizing 6,7-dialkoxy-1,2,3,4-tetrahydroisoquinolin-8-ols via the compounds, and use of the 6,7-dialkoxy-3,4-dihydroisoquinolin-8-ols for preparation of the 6,7-dialkoxy-1,2,3,4-tetrahydroisoquinolin-8-ols. It is possible, according to this invention, to obtain the 6,7-dialkoxy-1,2,3,4-tetrahydroisoquinolin-8-ols, which have hitherto been difficult to synthesize, via the 6,7-dialkoxy-3,4-dihydroisoquinolin-8-ols in a high yield.