Process for producing tricyclic compounds or salts thereof

Details Process for producing tricyclic compounds or salts thereof Process for producing tricyclic compounds or salts thereof

C - Chemistry, Metallurgy

07

D

C07D 471/06 (2006.01) C07D 519/00 (2006.01) C07F 5/02 (2006.01)

Patent

CA 2081548

-64- A B S T R A C T A compound represented by the following general formula: Image (A) which is useful as an intermediate for production of a clinically excellent synthetic antibacterial, a salt thereof, and a process for producing the same. In said formula, R1 is a hydrogen atom or a carboxyl-protecting group; R2 is a hydrogen atom or a lower alkyl group; X1 is a hydrogen atom or a halogen atom; X2 is a halogen atom; X? is a hydrogen atom or a halogen atom; A is a methylene group; a group of >CH-COOR', etc., in which R4, R5 and R6 each are a hydrogen atom or a carboxyl- protecting group; B is a methylene group or a carbonyl group; provided that both A and B must not be methylene groups at the same time.

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