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The synthesis of new 6-exomethylene penams with substituted triazole ring was described. The 6,6-dibromopenam 5 was reacted with $CH_3$MgBr and substituted triazole 4 to afford the 6-bromo penicillanate 6, which was treated with acetic anhydride to give acetoxy compound 7. The deacetobromination of acetoxy compound 7 with zinc and acetic acid gave 6-exomethylene penams 8, which was oxidized to sulfones 9 by m-CPBA. The p-methoxybenzyl compounds 6∼9 were deprotected by AlCl$_3$ and neutralized to give the sodium salts 10∼13.
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