One-Pot Synthesis of 2-Pyridones via Chemo- and Regioselective Tandem Blaise Reaction of Nitriles with Propiolates
摘要:
The Blaise reaction intermediate, generated in situ from Reformatsky reagent and nitrile, reacted with propiolates in a chemo- and regioselective manner to afford 2-pyridone derivatives in good to excellent yields
One-Pot Synthesis of 2-Pyridones via Chemo- and Regioselective Tandem Blaise Reaction of Nitriles with Propiolates
作者:Yu Sung Chun、Ka Yeon Ryu、Young Ok Ko、Joo Yeon Hong、Jongki Hong、Hyunik Shin、Sang-gi Lee
DOI:10.1021/jo901642t
日期:2009.10.2
The Blaise reaction intermediate, generated in situ from Reformatsky reagent and nitrile, reacted with propiolates in a chemo- and regioselective manner to afford 2-pyridone derivatives in good to excellent yields
Tandem Transformations of Nitriles into N-Heterocyclic Compounds by Electrophilic Trapping of Blaise Reaction Intermediates
作者:Hyunik Shin、Sang-gi Lee、Ju Kim、Yu Chun
DOI:10.1055/s-0031-1290814
日期:2012.6
Tandem transformations of nitriles into various N-heterocycles have been accomplished through the reaction of electrophiles with Blaise reaction intermediates formed in situ. The reaction of the Blaise reaction intermediates with propiolates gives 2-pyridones through consecutive C- and N-nucleophilic reactions. The tandem reactions of the Blaise reaction intermediate with 1,3-enynes proceed through C-nucleophilic addition followed by an electrocyclization-aromatization cascade to give pyridines. Exocyclic enamino esters can be prepared by transformations of omega-chloroalkyl nitriles through chemoselective intramolecular alkylation of the Blaise reaction intermediate. Palladium-catalyzed intramolecular arylations or copper-catalyzed intermolecular cross-coupling reactions of the Blaise reaction intermediate give a range of indole derivatives. Combinations of tandem alkylations and palladium-catalyzed couplings of the Blaise reaction intermediates of omega-chloroalkyl nitriles give N-fused indoles.