Access to 3‐(2‐Oxoalkyl)‐azaspiro[4.5]trienones
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Acid‐Triggered Oxidative Cascade Reaction through Alkenyl Peroxide Radical Intermediate
作者:Chang‐Sheng Wang、Thierry Roisnel、Pierre H. Dixneuf、Jean‐François Soulé
DOI:10.1002/adsc.201801203
日期:2019.2
Azaspiro[4.5]trienones bearingketone side chains at the 3‐position are prepared from N‐alkyl‐arylpropiolamides and ketones via oxidative 1,2‐difunctionalization of alkynes. The cascade sequence starts with the generation of alkenyl peroxide intermediates, which are obtained by addition of tert‐butyl hydroperoxide to ketones in presence of a catalytic amount of a strong acid. Then, the ketone radical adds to
Palladium-Catalyzed Cross-Coupling of Electron-Poor Terminal Alkynes with Arylboronic Acids under Ligand-Free and Aerobic Conditions
作者:Ming-Bo Zhou、Wen-Ting Wei、Ye-Xiang Xie、Yong Lei、Jin-Heng Li
DOI:10.1021/jo101063p
日期:2010.8.20
Palladium-catalyzed cross-coupling reaction of terminal alkynes with arylboronicacids has been described. In the presence of Pd(OAc)2 and Ag2O, a variety of terminal alkynes, including electron-poor terminal alkynes, smoothly underwent the reaction with numerous boronic acids to afford the corresponding internal alkynes in moderate to good yields. Moreover, this methodology was applied to the synthesis
Ni‐Catalyzed Cyclization of Enynes and Alkynylboronates: Atom‐Economical Synthesis of Boryl‐1,4‐dienes
作者:Natalia Cabrera‐Lobera、M. Teresa Quirós、Elena Buñuel、Diego J. Cárdenas
DOI:10.1002/chem.201903405
日期:2019.11.18
We report a novel atom-economical Ni-catalyzed cyclization reaction of enynes with alkynylboronates. The reaction employs a non-expensive Ni salt, a phosphine-based ligand and easy-handling alkynylboronates as boron-carbon source. The reaction provides complex fused-bicyclic compounds containing borylated 1,4-cyclohexadienes in high yields in short reaction times, involving the formation of two C-C