• YAKHAK HOEJI
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• v.43 no.6
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• pp.782-788
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• 1999

7-Oxocephalosporanate 1 was treated with phosphonium salts 2~4 by Wittig reaction to afford 7-exomethylene cephalosporanates 5~7. They were oxidized to sulfones 8~10 with mCPBA. Deprotecton of benzhydryl 7-exomethylene cephalosporanate with $AlCl_3$ and NaHCO_3$ gave sodium salts of 7-exomethylene cephalosporanates 11~16. The ${\beta}-lactamase$ inhibitory activity of synthesized compounds 11~16 were compared with sulbactam, tazobactam and clavulanic acid against Type I, II, III, IV and TEM-2 $\beta$-lactamase in vitro. Compound 15 showed more potent activity than sulbactam and clavulanic acid against Type III, IV ${\beta}-lactamase$ enzyme.

• YAKHAK HOEJI
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• v.52 no.4
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• pp.311-315
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• 2008

The synthesis of 7-arylidene cephalosporanates for ${\beta}-lactamase$ inhibitor was described. The reactions of substituted benzyl halides $[1]{\sim}[3]$ with triphenylphosphine gave triphenylphcsphonium chlorides $[4]{\sim}[6]$. These phosphonium salts were treated with n-butyllithium to give ylides, which were reated with 7-oxocephalosporanate [7] by Wittig reaction to afford the 7-exomethylene cephalosporanates $[8]{\sim}[10]$. These cephalosporanates were oxidized to cephalosporanate sulfones $[11]{\sim}[13]$ with mCPBA. The deprotection of benzhydryl cephalosporanate $[8]{\sim}[13]$ with $AlCl_3$ and $NaHCO_{3}$ gave sodium salts of 7-arylidene cephalosporanates $[14]{\sim}[19]$.