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. 08, 2005
Filed:
Feb. 20, 2001
Tomomi Ikemoto, Takarazuka, JP;
Tatsuya Ito, Kashiba, JP;
Kiminori Tomimatsu, Minoo, JP;
Takeda Chemical Industries, Ltd., Osaka, JP;
Abstract
A process suitable for safely mass-producing, through a short step, cyclic compounds useful in medicines, agricultural chemicals, foods, cosmetics, and chemical products or as intermediates therefor. The process, which is for producing a compound represented by the formula:{wherein Z represents an electron-attracting group; W represents optionally substituted ethylene or optionally substituted vinylene; Rrepresents hydrogen or an optionally substituted hydrocarbon group; and X represents a divalent group [provided that when W represents optionally substituted vinylene, then —X—CH—Z is not —X—X—CH—Z (wherein Xrepresents sulfur or optionally substituted nitrogen and Xrepresents optionally substituted ethylene)]} or a salt thereof, is characterized by subjecting a compound represented by the formula (II) or a salt thereof:(wherein the symbols have the same meanings as the above) to a ring closure reaction in a solvent containing a carbonic diester.