Studies on the syntheses of heterocyclic compounds. Part 877. An alternative synthesis of protected (±)-thienamycin and a related compound
作者:Tetsuji Kametani、Shyh-Pyng Huang、Takayasu Nagahara、Shuichi Yokohama、Masataka Ihara
DOI:10.1039/p19810000964
日期:——
An alternative total synthesis of protected (±)-thienamycin (2) and an analogue is described. (±)-4β-(2,2-Dimethoxyethyl)-3α-[(1R*)-1-(p-nitrobenzyloxycarbonyloxy)ethyl]azetidin-2-one (5), prepared from isoxazoline derivatives (4), was converted into the 2-(p-nitrobenzyloxycarbonylamino)ethyl (12) and phenyl (13) thioester phosphoranes. Intramolecular Wittig reaction of (12) and (13) produced the corresponding
描述了受保护的(±)-硫霉素(2)和类似物的另一种全合成。由异恶唑啉衍生物(4)制备的(±)-4β-(2,2-二甲氧基乙基)-3α-[(1 R *)-1-(对硝基苄氧基羰氧基氧基)乙基]氮杂环丁烷-2-酮(5)为转化为2-(对硝基苄氧基羰基氨基)乙基(12)和苯基(13)硫酯磷烷。(12)和(13)的分子内维蒂希反应以不良的产率产生了相应的碳青霉烯(2)和(3)。利用卡宾插入反应并随后引入硫化物部分,实现了将(5)有效转化为对硝基苄基保护的噻霉素衍生物(2)和类似物(3)。