From penicillin to penem and carbapenem. II synthesis of 3,4-disubstituted azetidinone derivatives from 6,6-bis(phenylselenyl)penicillanate
作者:Koichi Hirai、Yuji Iwano、Katsumi Fujimoto
DOI:10.1016/s0040-4039(00)88685-2
日期:1982.1
yield. Compound 5 was deselenylated to 10. Oxidation, and then the basic epimerization of the cis sulfone 11 gave trans sulfone derivative 12. The trans sulfone 12 was degraded to the monocyclic β-lactams 14, 15 which are important precursors for the carbapenem synthesis.
6,6-双(苯基硒烯基)青霉酸酯2a以高收率转化为6-1'(R)-羟乙基取代的青霉酸酯5。化合物5被去硒烯基化为10。氧化,然后顺式砜的基本差向异构化得到反式砜衍生物12。反式砜12被降解成单环β-内酰胺14、15,它们是碳青霉烯合成的重要前体。