Process for preparing 3-(4-aminoethoxy-benzoyl)benzo¬b|-...

Details Process for preparing 3-(4-aminoethoxy-benzoyl)benzo¬b|-... Process for preparing 3-(4-aminoethoxy-benzoyl)benzo¬b|-...

C - Chemistry, Metallurgy

07

D

C07D 333/54 (2006.01) C07D 333/56 (2006.01) C07D 409/12 (2006.01) C07D 413/12 (2006.01)

Patent

CA 2154319

The invention provides a process for preparing 6-alkoxy-3- (4-alkoxyphenyl)benzo[B]thiophenes in good yield on a manufacturing scale without generating a thick, potentially yield-reducing, paste. The invention also provides methods for converting a-(-alkoxyphenylthio) -4-alkoxyacetophenones into 6- hydroxy-2-(4-hydroxyphenyl)-3-[4-(2-aminoethoxy)- benzoyl]benzo[B]thiophenes via acylation of a dialkoxy benzo[B]thiophene. Each of these preparations relies on an intramolecular cyclization of a dialkoxy acetophenone derivative to yield a benzo[B]thiophene without generating a thick paste that lowers overall yields on a manufacturing scale.

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