Stereoselective Total Synthesis of (+)-Streptazolin by Using a Temporary Silicon-Tethered RCM Strategy
摘要:
[GRAPHICS]A stereoselective total synthesis of (+)-streptazolin 1 was accomplished starting from readily available aminocyclopentenol (-)-7. The synthetic sequence highlights an intramolecular aldol condensation strategy to construct the piperidine core and a silicon-tethered ring-closing metathesis strategy to install the Z exocyclic ethylidene side chain of streptazolin. Separate protodesilylation and Tamao oxidation of a common intermediate 32 afforded streptazolin and the precursor for 13-hydroxystreptazolin. The overall yield for (+)-streptazolin 1 from aminocyclopentenol (-)-7 was 4.8% for a total of 16 steps.
Synthetic studies on bradykinin antagonist martinellines: construction of a pyrrolo[3,2-c]quinoline skeleton using silicon-tether RCM reaction and allylic amination
作者:Osamu Hara、Kazuhiko Sugimoto、Yasumasa Hamada
DOI:10.1016/j.tet.2004.08.014
日期:2004.10
The pyrrolo[3,2-c]quinoline consisting of a core structure of martinellines, the first naturally occurring heterocycle, was prepared through silicon-tether ring-closing metathesis reaction and intramolecular allylic amination as key steps. (C) 2004 Elsevier Ltd. All rights reserved.
Stereoselective Total Synthesis of (+)-Streptazolin by Using a Temporary Silicon-Tethered RCM Strategy
作者:Fangzheng Li、Marvin J. Miller
DOI:10.1021/jo060555y
日期:2006.7.1
[GRAPHICS]A stereoselective total synthesis of (+)-streptazolin 1 was accomplished starting from readily available aminocyclopentenol (-)-7. The synthetic sequence highlights an intramolecular aldol condensation strategy to construct the piperidine core and a silicon-tethered ring-closing metathesis strategy to install the Z exocyclic ethylidene side chain of streptazolin. Separate protodesilylation and Tamao oxidation of a common intermediate 32 afforded streptazolin and the precursor for 13-hydroxystreptazolin. The overall yield for (+)-streptazolin 1 from aminocyclopentenol (-)-7 was 4.8% for a total of 16 steps.
Tether-Mediated Stereocontrol in Intramolecular Azomethine Ylide Cycloadditions
作者:Philip P. Garner、Philip B. Cox、Stephen J. Klippenstein、Wiley J. Youngs、David B. McConville
DOI:10.1021/jo00101a005
日期:1994.11
The computationally guided design of a silicon-based tether system for stereoselective intramolecular azomethine ylide cycloadditions is described.