Reaction between nitrogen‐centered radicals and unsaturated C−C bonds is an effective synthetic strategy for the construction of nitrogen‐containing molecules. Although the reactions between nitrogen‐centered radicals and alkenes have been studied extensively, their counterpart reactions with alkynes are extremely rare. Herein, the first example of reactions between azidylradicals and alkynes is described
A copper-catalyzedhighlyregio- and stereospecific selenosulfonation of alkynes with arylsulfonohydrazides and diphenyl diselenide has been developed. This novel three component reaction proceeds under very mild conditions and with a broad scope of substrates, providing a wide range of (E)-β-selenovinyl sulfones in good to excellent yields.
TfOH-catalyzed tandem cyclopropane ring enlargement/C–C formation/etherification of alkynylcyclopropanes and 1,3-diketones to cyclobutane-fused dihydrofurans
作者:Siyu Ye、Zhi-Xiang Yu
DOI:10.1039/c0cc04283h
日期:——
A new type of TfOH-catalyzed tandem cyclopropane ring enlargement/CâC formation/etherification reaction between alkynylcyclopropanes and 1,3-diketones to cyclobutane-fused dihydrofurans is described. The reaction tolerates a range of aryl and alkyl substituents with moderate to good yields.
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
Trisulfur Radical Anion (S<sub>3</sub><sup>•–</sup>) Involved [1 + 2 + 2] and [1 + 3 + 1] Cycloaddition with Aromatic Alkynes: Synthesis of Tetraphenylthiophene and 2-Benzylidenetetrahydrothiophene Derivatives
作者:Jing-Hao Li、Qi Huang、Shun-Yi Wang、Shun-Jun Ji
DOI:10.1021/acs.orglett.8b02066
日期:2018.8.3
S3•–-mediated [1 + 2 + 2] and [1 + 3 + 1] cycloaddition reactions of aromatic alkynes to give tetraphenylthiophene and 2-benzylidenetetrahydrothiophene derivatives via two C–S bond formations are developed. These two protocols provide new, simple, and straightforward strategies to construct tetraphenylthiophene and 2-benzylidenetetrahydrothiophene derivatives under transition-metal-free conditions