作者:Czesław Bełżecki、Romuald Urbański、Zofia Urbańczyk-Lipkowska、Marek Chmielewski
DOI:10.1016/s0040-4020(97)00917-4
日期:1997.10
Readily available from d-arabinal and l-rhamnal 2-C:1-N-carbonyl-2-deoxy-β-d-arabino- and -α-l-gluco-pyranosylamines 5, 25 and 26 were transformed into cephems 45 and 49 via a sequence of reactions consisting of alkylation of the β-lactam nitrogen atom, deprotection of pyranoid hydroxy groups, glycolic cleavage of the vic diol grouping, discrimination of carbon atoms which were separated by periodate
可容易地从d-arabinal和1- rhamnal 2-C:1-N -羰基- 2-脱氧β-d-arabino-和-α-L-葡糖pyranosylamines 5,25和26转化到头孢45和49.通过一系列的反应序列,包括β-内酰胺氮原子的烷基化,吡喃类羟基的脱保护,vic二醇基团的羟基裂解,通过高碘酸氧化分离的碳原子的辨别以及形成1,3-恶嗪六元环与β-内酰胺片段稠合。在通过较大的甲硅烷基取代基或通过内酯化还原和保护羟甲基之一后,实现了在乙醇裂解步骤中获得的两个醛基的区分。