Total synthesis of (-)-kopsinine and ent-(+)-kopsinine.

Total synthesis of (-)-kopsinine and ent-(+)-kopsinine.
复制标题

DOI:
10.1016/j.tet.2014.07.094
复制
发表时间:
2015-06-03
期刊:
影响因子:
2.1
通讯作者:
Boger, Dale L.
Boger, Dale L.
中科院分区:
化学3区
文献类型:
--
作者:
Lee, Kiyoun;Boger, Dale L.

文献摘要

参考文献

被引文献

相似文献

详细介绍了(−)-kopsinine及其非天然对映体的全合成,其中包括一个后期SmI 2介导的跨环自由基共轭加成反应,用于构建具有战略性C21-C2键形成的核心双环[2.2.2]辛烷环系统。该方法的关键是通过1,3,4-恶二唑的分子内[4+2]/[3+2]环加成级联组装基础骨架,该级联在单个步骤中提供前体C21官能化的五环系统1,其中在天然产物中发现的C3甲酯用作关键的1,3,4-恶二唑取代基,活化它以参与引发Diels-Alder反应并稳定中间体1,3-偶极。
The total synthesis of (−)-kopsinine and its unnatural enantiomer is detailed, enlisting a late-stage SmI2-mediated transannular free radical conjugate addition reaction for construction of the core bicyclo[2.2.2]octane ring system with strategic C21–C2 bond formation. Key to the approach is assemblage of the underlying skeleton by an intramolecular [4+2]/[3+2] cycloaddition cascade of a 1,3,4-oxadiazole that provided the precursor C21 functionalized pentacyclic ring system 1 in a single step in which the C3 methyl ester found in the natural product served as a key 1,3,4-oxadiazole substituent, activating it for participation in the initiating Diels–Alder reaction and stabilizing the intermediate 1,3-dipole.
DOI: 10.1021/ja908819q
发表时间: 2010-03-10
影响因子: 15
作者:
Campbell, Erica L.;Zuhl, Andrea M.;Liu, Christopher M.;Boger, Dale L.
通讯作者: Boger, Dale L.
DOI: 10.1021/ja500548e
发表时间: 2014-02-26
影响因子: 15
作者:
Lee K;Boger DL
通讯作者: Boger DL
DOI: 10.1021/ja910695e
发表时间: 2010-03-24
影响因子: 15
作者:
Kato D;Sasaki Y;Boger DL
通讯作者: Boger DL
DOI: 10.1021/jo00195a035
发表时间: 1984-01-01
影响因子: 3.6
作者:
BOGER, DL;BROTHERTON, CE
通讯作者: BROTHERTON, CE
DOI: 10.1002/hlca.19610440608
发表时间: 1961-01-01
影响因子: 1.8
作者:
KUMP, WG;SCHMID, H
通讯作者: SCHMID, H