Copper salt-catalyzed homo-coupling reaction of potassium alkynyltrifluoroborates: a simple and efficient synthesis of symmetrical 1,3-diynes
作者:Marcio W. Paixão、Minéia Weber、Antonio L. Braga、Juliano B. de Azeredo、Anna M. Deobald、Hélio A. Stefani
DOI:10.1016/j.tetlet.2008.02.083
日期:2008.4
The copper-catalyzed dimerization of alkynyltrifluoroborates proceeds readily with good yields. The homo-coupling reaction can be effected in DMSO, in the open air, using Cu(OAc)2 as catalyst in the absence of any other additives. A variety of functional groups are tolerated.
A Mild Benzannulation through Directed Cycloaddition Reactions
作者:James D. Kirkham、Roger J. Butlin、Joseph P. A. Harrity
DOI:10.1002/anie.201200917
日期:2012.6.25
Simple as ABC: Alkynyl borane cycloadditions can be substrate‐directed to assemble aromatic difluoroboranes within an extremely mild and efficient reaction manifold compared to that of traditional methods (see scheme). The aromatic boranes are readily transformed into a range of useful products.
Ultrasound-Assisted Synthesis
of Functionalized 1,3-Enynes by Palladium-Catalyzed Cross-Coupling
Reaction of α-Styrylbutyltelluride with Alkynyltrifluoroborate
Salts
An ultrasound-assisted synthesis of functionalized 1,3-enyne scaffolds is described and illustrated by palladium-catalyzed cross-coupling of potassium alkynyltrifluoroborate salts and α-styrylbutyltellurides. This procedure offers easy access to 1,3-enyne architecture that contains aliphatic and aromatic groups in good to excellent yields.
Development of a Mild and Versatile Directed Cycloaddition Approach to Pyridines
作者:Sylvestre P. J. T. Bachollet、Jérôme F. Vivat、Dean C. Cocker、Harry Adams、Joseph P. A. Harrity
DOI:10.1002/chem.201403916
日期:2014.9.26
The aza‐Diels–Alder cycloaddition of 1,2,4‐triazines with alkynes offers a rapid and convenient method for the synthesis of highly substituted pyridines, but often requires harsh conditions and long reaction times. The present study offers a solution to these limitations by use of a temporary tether established by a Lewis acid–base complexation of in situ generated alkynylboranes and triazines bearing
1,2,4-三嗪与炔烃的氮杂狄尔斯-阿尔德环加成反应为合成高度取代的吡啶提供了一种快速便捷的方法,但通常需要苛刻的条件和较长的反应时间。本研究通过使用原位生成的带有路易斯碱性供体的炔基硼烷和三嗪的路易斯酸碱络合建立的临时系链,为这些限制提供了解决方案。环加成反应在 40 °C 下 20 分钟内发生,可直接获得各种吡啶,并具有完整且可预测的区域控制。碳-硼键可以通过交叉偶联进一步官能化,从而允许在环加成后引入更多官能团。