Process for the preparation of benzothiophene derivatives

Details Process for the preparation of benzothiophene derivatives Process for the preparation of benzothiophene derivatives

C - Chemistry, Metallurgy

07

D

C07D 417/14 (2006.01) C07D 333/54 (2006.01) C07D 413/12 (2006.01)

Patent

CA 2314699

The present invention is concerned with a novel process for the preparation of the hydroxybenzothiophene of Formula I (see formula I) comprising cyclocarbonylation of a compound of Formula II (see formula II) wherein -OR is as defined in the specification, followed by saponification. The compound of Formula I is a building block of pharmaceutically active substances, e.g. 5- [4-[2-(5- methyl-2-phenyl-4-oxazolyl)ethoxy]-7-benzothiophenylmethyl]-2,4- thiazolidinedione and the corresponding sodium salt.

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