Benzo¢b!thiophen-5-yl derivative and process for producing...

Details Benzo¢b!thiophen-5-yl derivative and process for producing... Benzo¢b!thiophen-5-yl derivative and process for producing...

C - Chemistry, Metallurgy

07

D

C07D 333/54 (2006.01) C07D 409/00 (2006.01) C07D 409/04 (2006.01) C07F 7/10 (2006.01)

Patent

CA 2093048

This invention relates to a process for producing a compound represented by formula (6a) or (6b): (6a) Image or Image (6b) wherein R2 represents a hydrogen atom or a hydroxyl- protecting group and R4 and R5, which may be the same or different, represent lower alkyl groups, using a compound represented by formula (2a) or (2b) obtained by preferential crystallization: (2a) Image or Image (2b) and also to a compound represented by the following formula (7) which is an intermediate useful for producing the compound of formula (6a) or (6b): Image (7) wherein R1 represents a group represented by formula (8): Image wherein R is as defined above, and R3 represents a hydrogen atom or a carboxyl-protecting groups, a group represented by formula (9): Image (9) or a group represented by formula (10): Image wherein R is as defined above.

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