High‐Yielding Synthesis of the Anti‐Influenza Neuraminidase Inhibitor (−)‐Oseltamivir by Two “One‐Pot” Sequences
作者:Hayato Ishikawa、Takaki Suzuki、Hideo Orita、Tadafumi Uchimaru、Yujiro Hayashi
DOI:10.1002/chem.201001108
日期:2010.11.8
Michael reactions, a thiol Michael reaction, and a base‐catalyzed isomerization. Six reactions can be successfully conducted in the second one‐pot reaction sequence; these are deprotection of a tert‐butyl ester and its conversion into an acyl chloride then an acyl azide, Curtius rearrangement, amide formation, reduction of a nitro group into an amine, and a retro Michael reaction of a thiol moiety. A column‐free
通过使用两个“一锅”反应序列可实现有效的不对称总合成(-)-oseltamivir(一种抗病毒剂),其总收率极佳(60%),并且仅需通过柱色谱法纯化一次即可。第一个单锅反应序列由二苯基脯氨醇甲硅烷基醚介导的不对称迈克尔反应,多米诺骨牌迈克尔反应/霍纳-沃兹沃思-埃蒙斯反应与逆醛醇/霍纳-沃兹沃斯-埃蒙斯反应和逆迈克尔反应,硫代迈克尔反应组成,以及碱催化的异构化。在第二个“一锅法”反应序列中可以成功进行六个反应。这些都是去保护叔-丁基酯及其转化为酰氯,然后转化为酰叠氮,Curtius重排,酰胺形成,硝基还原为胺以及硫醇基团的逆迈克尔反应。还建立了(-)-奥司他韦的无柱合成方法。