Synthesis of Enantiopure 7-[3-Azidopropyl]indolizidin-2-one Amino Acid. A Constrained Mimic of the Peptide Backbone Geometry and Heteroatomic Side-Chain Functionality of the Ala-Lys Dipeptide
作者:Zhe Feng、William D. Lubell
DOI:10.1021/jo001252l
日期:2001.2.1
alcohol gave (2S,4R,8S)-di-tert-butyl 4-[3-tert-butyldimethylsiloxypropyl]-5-oxo-2,8-di-[N-(PhF)amino]azelate 9 as a pure diastereomer in 33% overall yield. Linear ketone 9 was then converted into the indolizidinone heterocycle by a route featuring reductive amination, lactam cyclization, and isolation by way of a silyl ether which provided the (6S,7R)-isomer of 11.
对映纯N-(BOC)氨基-7- [3-叠氮丙基]吲哚并丁-2-酮酸1是通过用叠氮化钠置换其7-羟丙基对应物11的甲磺酸盐并随后进行酯水解而合成的。从(2S,8S)-二叔丁基5-氧代-2,8-的烷基化开始,得到N-(BOC)氨基-7- [3-羟丙基]吲哚并丁-2-酮酯11。二[N-(PhF)氨基]壬二酸酯5(PhF = 9-(9-苯基芴基))。5的立体选择性烯丙基化,区域选择性的烯烃氢硼化,选择性的伯醇保护作为甲硅烷基醚,以及仲醇的氧化得到(2S,4R,8S)-二叔丁基4- [3-叔丁基二甲基甲硅烷氧基丙基] -5-作为纯非对映异构体的oxo-2,8-二-[N-(N-(PhF)氨基]壬二酸酯9,总产率为33%。然后通过具有还原胺化作用的路线,将线性酮9转化为吲哚西酮酮杂环,