Process for the preparation of thiophene derivatives and...

Details Process for the preparation of thiophene derivatives and... Process for the preparation of thiophene derivatives and...

C - Chemistry, Metallurgy

07

D

260/329.1, 260/2

C07D 333/36 (2006.01) C07D 333/38 (2006.01) C07D 333/48 (2006.01) C07D 409/04 (2006.01)

Patent

CA 1338108

Thiophene derivatives of the formula I Image having an - optionally substituted - amino group on the thiophene ring are prepared by dehydrogenating dihydrothiophenes of the formulae IIa and/or IIb Image Image IIa IIb substituted in a manner identical to that of the desired thiophene derivatives, by means of H2O2, the dihydrothiophenes being reacted with H2O2 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.

591117

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