【药物名称】
化学结构式(Chemical Structure):
参考文献No.582845
标题:The synthesis and evaluation of 3-substituted-7-(alkylidene)cephalosporin sulfones as beta-lactamase inhibitors
作者:Buynak, J.D.; Doppalapudi, R.; Adam, G.
来源:Bioorg Med Chem Lett 2000,10(9),853
合成路线图解说明:

Cephalosporanate (I) was equilibrated with its delta-2,3 isomer (II) by treatment with Et3N. Isomer (II) was then carefully hydrolyzed to alcohol (III) without formation of the corresponding lactone by-product. The oxidation of alcohol (III) with pyridinium dichromate gave aldehyde (IV), which was subjected to a Wittig condensation with phosphorane (V) to produce the unsaturated E-amide (VI) as the major isomer. Sulfur oxidation with MCPBA, with concomitant double bond isomerization, furnished sulfone (VII). Finally, removal of the benzhydryl protecting group with trifluoroacetic acid, followed by treatment with sodium bicarbonate yielded the title sodium carboxylate salt.

Drug Information Express,Drug R&D,Chemical Database,Patent Search.
Copyright © 2006-2024 Drug Future. All rights reserved.Contact Us