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    • 3. 发明授权
    • Process for the preparation of thiophene derivatives and also new
dihydrothiophene 1-oxides
    • 制备噻吩衍生物的方法以及新的二氢噻吩1-氧化物
    • US5166346A
    • 1992-11-24
    • US630434
    • 1990-12-20
    • Robert RippelHans-Wolfram FlemmingManfred Rukwied
    • Robert RippelHans-Wolfram FlemmingManfred Rukwied
    • C07D333/38C07D333/48
    • C07D333/48C07D333/38
    • Process for the preparation of thiophene derivatives and also new dihydrothiophene 1-oxides.Thiophene derivatives having an--optionally substituted--amino group on the thiophene ring are prepared by dehydrogenating dihydrothiophenes, substituted in a manner identical to that of the desired thiophene derivatives, by means of H.sub.2 O.sub.2, the dihydrothiophenes being reacted with H.sub.2 O.sub.2 in a first reaction stage in a neutral medium to give the corresponding sulfoxides, which are then rearranged into the thiophene derivatives by means of acid in the second reaction stage.The dihydrothiophene 1-oxides formed as intermediates in this reaction are new compounds. Like the thiophene derivatives formed from them by rearrangement with acid, they are intermediates, mainly in the sector of plant protection agents and pharmaceuticals.
    • 制备噻吩衍生物的方法以及新的二氢噻吩1-氧化物。 在噻吩环上具有任选取代的氨基的噻吩衍生物通过用H 2 O 2脱氢二氢噻吩,以与所需噻吩衍生物相同的方式进行脱氢,二氢噻吩与H 2 O 2反应,在第一反应阶段 中性介质,得到相应的亚砜,然后在第二反应阶段通过酸将其重排成噻吩衍生物。 在该反应中作为中间体形成的二氢噻吩1-氧化物是新的化合物。 像它们通过与酸重排形成的噻吩衍生物一样,它们是中间体,主要在植物保护剂和药物领域。