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:
Apr. 21, 2009
Filed:
Aug. 25, 2005
Tomomi Ikemoto, Osaka, JP;
Takeshi Yamasaki, Osaka, JP;
Tomomi Ikemoto, Osaka, JP;
Takeshi Yamasaki, Osaka, JP;
Takeda Pharmaceutical Company Limited, Osaka, JP;
Abstract
A process for the production of an aromatic azo compound having a 2,3-dihydrobenzofuran ring bearing a diazo group at the 5-position of the ring by conducting the diazo coupling of a 2,3-dihydrobenzofuran derivative represented by the general formula (II): [wherein Rand Rare each independently Calkyl; Ris optionally substituted aryl; and R, Rand Rare each independently hydrogen, Calkyl, halogeno, Calkoxy, or Calkylthio] with a benzenediazonium salt having an electron-withdrawing group at the p- and/or o-position in a mixed solvent composed of water and a polar organic solvent.