申请人:Beecham Group Limited
公开号:US04362880A1
公开(公告)日:1982-12-07
An improved process for the preparation of 3-substituted thiophenes. The thiophenes are useful for the preparation of penicillins and cephalosporins. The process is for the preparation of a thiophene of formula (I): ##STR1## where R.sup.1 represents a carboxylic acid group, or an ester or amide thereof or a nitrile group; R.sup.2 represents a group suitable for use as an .alpha.-substituent in the side-chain of a penicillin or cephalosporin; which comprises treating under basic conditions a compound of formula (II): ##STR2## wherein X represents halogen or optionally functionalized hydroxyl, Y represents halogen, hydroxyl, or alkoxy; with a source of nucleophilic sulphur ionically bound to a polymeric support.
一种改进的制备3-取代噻吩的过程。这些噻吩对于青霉素和头孢菌素的制备是有用的。该过程用于制备化学式(I)的噻吩:其中R.sup.1代表羧酸基团,或其酯或酰胺或腈基;R.sup.2代表适合用作青霉素或头孢菌素侧链中α-取代基的基团;包括在碱性条件下处理化学式(II)的化合物:其中X代表卤素或可选择功能化的羟基,Y代表卤素、羟基或烷氧基;与离子性结合到聚合物支撑上的硫亲核源。