| 摘要 |
Title compds. (I; M = H, alkali metal atom sodium Potassium, H+NR3 (R3 = H, C1-3 alkyl); R =C2-5 lower alkyl) were prepd. Thus, one carboxylic group of II was protected with N, N'-bis-trimethlsilyl imidazolidinone or amine salt to give III (R1 = trimethylsilan, C2-5 t-amine), and then the other carboxylic group was reacted with acyltalide to give (IV; R2 = (R3R4R5), -OC2H5, (R4,R5 = H, C2-5 t-amine) followed by reaction with 6-amino-peni- cillanic acid salt to give I.
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