Synthesis of the Louisianin Alkaloid Family via a 1,2,4-Triazine Inverse-Electron-Demand Diels−Alder Approach
摘要:
Isolated in 1995, the four members of the louisianin family (A, B, C and D) are simple pyridine and 2-pyridone alkaloids that display both antibacterial and anticancer activity. Herein we describe the synthesis of all four members of the louisianin family, from I conveniently prepared 1,2,4-triazine and via I common tetrasubstituted pyridine intermediate. This study includes the synthesis of louisianin B in both racemic form and is the (-)-enantiomer.
Synthesis of the Louisianin Alkaloid Family via a 1,2,4-Triazine Inverse-Electron-Demand Diels−Alder Approach
摘要:
Isolated in 1995, the four members of the louisianin family (A, B, C and D) are simple pyridine and 2-pyridone alkaloids that display both antibacterial and anticancer activity. Herein we describe the synthesis of all four members of the louisianin family, from I conveniently prepared 1,2,4-triazine and via I common tetrasubstituted pyridine intermediate. This study includes the synthesis of louisianin B in both racemic form and is the (-)-enantiomer.
An efficient 1,2,4-triazine-based route to the louisianin alkaloids
作者:Nicola Catozzi、Pierre Wasnaire、Richard J.K. Taylor
DOI:10.1016/j.tetlet.2008.03.026
日期:2008.4
A new, short and efficient route to louisianins C and D is described in which the pyridine ring is constructed from a disubstituted 1,2,4-triazine by an inverse-electron-demand Diels-Alder/retro-Diels-Alder/aromatisation cascade sequence. This eight-step route produces louisianin C in 16% overall yield from the commercially available 5-chloropent-1-yne. (c) 2008 Elsevier Ltd. All rights reserved.
Synthesis of the Louisianin Alkaloid Family via a 1,2,4-Triazine Inverse-Electron-Demand Diels−Alder Approach
作者:Nicola Catozzi、Michael G. Edwards、Steven A. Raw、Pierre Wasnaire、Richard J. K. Taylor
DOI:10.1021/jo901761r
日期:2009.11.6
Isolated in 1995, the four members of the louisianin family (A, B, C and D) are simple pyridine and 2-pyridone alkaloids that display both antibacterial and anticancer activity. Herein we describe the synthesis of all four members of the louisianin family, from I conveniently prepared 1,2,4-triazine and via I common tetrasubstituted pyridine intermediate. This study includes the synthesis of louisianin B in both racemic form and is the (-)-enantiomer.