| 摘要 |
Optically active cpds of formula (I) and their salts are prepd. by reacting a cpd. (II) with a reactive deriv. (e.g. acid halide, active ester or amide or mixed anhydride) of a cpd. (III), and sulfonating the reaction prod. and removing a protecting gp., if R1 is H. In the formuls, R= C1-4 alkyl, C3-4 alkenyl or alkynyl, carboxy-substd. - methyl, benzyl, phenyl, etc.; R1= H, -SO3H (or its inorganic or organic amine salt); R2= H or amino protecting gp. (I) are useful as antibacterials.
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