Optically active pyridobenzoxazine derivatives and intermediates thereof

Abstract From the Canadian patent

An optically active pyridobenzoxazine derivative a process for preparing the same and a novel intermediate useful for preparing the optically active Pyridobenzoxazine derivative are disclosed. The optically active pyridobenzoxazine derivative of the general formula (VI): (VI), wherein X1 represents a halogen atom R1 represents an, alkyl group having 1 to 4 carbon atoms and R3 represents, an alkyl group having 1 to 3 carbon atoms possess, increased antimicrobial activity and reduced toxicity. The intermediate is useful for preparing such optically active pyridobenzoxazine derivatives such as Ofloxacin and anolog compounds. The novel intermediate has the following general formula (X):, (X), …