Title:
【発明の名称】ベンゾフラン化合物あるいはベンゾチオフェン化合物を調製する方法
Document Type and Number:
Japanese Patent JP2003512365
Kind Code:
A
Abstract:
The invention concerns a novel method for preparing a benzofuran or benzothiophene compound by cyclizing an aromatic compound bearing a side-chain comprising at least two carbon atoms, one of the carbon atoms being bound to the benzene cycle by an oxygen or sulphur atom, the other carbon atom is in carboxylic form and a formyl radical in ortho position relative to said chain. The inventive method is characterised in that it consists in cyclizing the latter in the presence of an efficient amount of a carbonate base in a medium comprising a carboxylic acid anhydride and optionally an organic solvent.
Inventors:
Syalama, Terry
Application Number:
JP2001531819A
Publication Date:
April 02, 2003
Filing Date:
October 23, 2000
Export Citation:
Assignee:
Rodia Simi
International Classes:
C07B37/10; C07B61/00; C07D307/79; C07D333/54; (IPC1-7): C07D307/79; C07D333/54
Domestic Patent References:
| JP2003512347A | 2003-04-02 |
Foreign References:
| DE3031738A1 | 1982-04-01 |
Other References:
JPN5002015822, Ｔ．ＳＵＺＵＫＩ, ＢＵＬＬＥＴＩＮ ＯＦ ＴＨＥ ＣＨＥＭＩＣＡＬ ＳＯＣＩＥＴＹ ＯＦ ＪＡＰＡＮ, 198309, Ｖ５６ Ｎ９, Ｐ２７６２−２７６７, JP
Attorney, Agent or Firm:
Yoshio Kawaguchi (4 outside)