Process for the preparation of 6-substituted-4-oxo-thieno [2,3b]thiopyran-2-sulfonic acid
申请人:SANDOZ AG
公开号:EP1918293A1
公开(公告)日:2008-05-07
The present invention relates to one-pot process for the preparation of 6-substituted-4-oxo-thieno[2,3b]thiopyran-2-sulfonic acid of formula (I), which comprises, reacting 2-thienylthiol with alkenyl acid in the presence of an aromatic hydrocarbon solvent and a base, cyclization of the resulting compound and further reacting with an acid anhydride and sulfuric acid to get the desired compound of formula (I).
The compound of formula (I) is the key intermediate in the preparation of (S,S)-5,6-dihydro-4-alkyylamino-6-substituted-4H-thieno[2,3-b]thiopyran-2-sulfonamide-7,7-dioxide and analogs thereof.
本发明涉及一种一锅法制备6-取代-4-氧代噻吩[2,3b]噻吩-2-磺酸(I)的方法,包括在芳香烃溶剂和碱的存在下,将2-噻吩硫醇与烯酸反应,得到所需的化合物后,进行环化反应,然后与酸酐和硫酸进一步反应,得到式(I)的目标化合物。式(I)的化合物是制备(S,S)-5,6-二氢-4-烷基氨基-6-取代-4H-噻吩[2,3-b]噻吩-2-磺酰胺-7,7-二氧化物及其类似物的关键中间体。