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.
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.
Efficient One-Pot Multifunctionalization of Alkynes en Route to α-Alkoxyketones, α-Thioketones, and α-Thio Thioketals by using an Umpolung Strategy
作者:Zhou Xu、Rongliang Zhai、Ting Liang、Liming Zhang
DOI:10.1002/chem.201703087
日期:2017.10.12
All topsy turvy: A new and broadly applicable method for the synthesis of unique α-oxygenated ketones, α-thio ketones and α-thio thioketals via umpolung reaction of nucleophiles-alcohols/thioalcohols and N-alkenoxypyridinium salts generated from alkynes in a one-pot manner is reported for the first time. The reaction is controllable and tunable with good substrates scope (46 examples) and excellent
Coupling of an advanced tri-functional building block by reductive amination leads to a protected backbone of a new archetype of foldamer
作者:Guillaume Gros、Emma Fowler、Jens Hasserodt
DOI:10.1016/j.tet.2014.07.010
日期:2014.9
explore a new archetype of foldamer that preferentially folds in water, we designed two types of tri-functional building blocks with increasingly favorable ketone deprotection properties. Both were selected for their ease of synthetic access and the availability of bulk starting material. While the first building block proved unsuitable for efficient coupling by reductiveamination, the second gave rise