PROCESS FOR PRODUCING THIOPHENE COMPOUND AND INTERMEDIATE THEREOF
申请人:Yanagihara Kazufumi
公开号:US20110124884A1
公开(公告)日:2011-05-26
To provide a novel process for producing a 2-aryl-3-hydroxy-4-substituted carbonyl thiophene compound or an intermediate thereof useful as an intermediate for production of medicines and agricultural chemicals.
A 2-aryl acetate compound represented by the formula (1):
wherein R
1
is an aryl group or the like, R
4
is a C
1-3
alkyl group or the like, and X is a leaving group, is reacted with a thioacetic acid compound to form a thioacetyl compound (3), the thioacetyl compound (3) is reacted with a vinyl ketone compound to form a γ-ketosulfide compound (5), which is cyclized under basic conditions to form a dihydrothiophene compound (6), and the dihydrothiophene compound (6) is oxidized by using an oxidizing agent to produce a 2-aryl-3-hydroxy-4-substituted carbonyl thiophene compound (7).