申请人:Yanagihara Kazufumi
公开号:US08399685B2
公开(公告)日:2013-03-19
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 R1 is an aryl group or the like, R4 is a C1-3 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).
提供一种新的生产2-芳基-3-羟基-4-取代羰基噻吩化合物或其中间体的方法,该方法可用作制药和农业化学品的中间体。将式(1)表示的2-芳基乙酸酯化合物:其中R1是芳基或类似物,R4是C1-3烷基或类似物,X是离去基团,与硫乙酸化合物反应形成硫乙酰化合物(3),硫乙酰化合物(3)与乙烯酮化合物反应形成γ-酮磺醚化合物(5),在碱性条件下环化成二氢噻吩化合物(6),使用氧化剂将二氢噻吩化合物(6)氧化,从而产生2-芳基-3-羟基-4-取代羰基噻吩化合物(7)。