Copper-Catalyzed Direct Alkenylation of<i>N</i>-Iminopyridinium Ylides
作者:James J. Mousseau、James A. Bull、André B. Charette
DOI:10.1002/anie.200906020
日期:2010.2.1
A versatile Cu‐catalyzed direct CH alkenylation of N‐iminopyridinium ylides, compatible with several different copper sources (including a penny), provides a powerful and inexpensive method for the synthesis of functionalized pyridine derivatives. Chemoselective functionalization of halide‐containing compounds allows the synthesis of alkenyl pyridines containing reactive tethers for further functionalization
作者:Antoine Nitelet、Johan Wouters、Damien F. Dewez、Gwilherm Evano
DOI:10.1021/acs.orglett.7b02859
日期:2017.12.1
An efficient procedure for the copper-catalyzed cross-coupling between a broad range of cyanamides and iodoalkenes is reported. Upon reaction with catalytic amounts of copper(I) iodide and 2,2′-bisimidazole in the presence of cesium carbonate in DMF at 80 °C, a fast, regioselective, and stereoretentive cross-coupling occurs. This reaction, which was found to have a broad substrate scope, provides the
Ligand-Free Iron-Catalyzed Carbon(sp<sup>2</sup>)–Carbon(sp<sup>2</sup>) Cross-Coupling of Alkenyllithium with Vinyl Halides
作者:Qiang Liu、Zhi-Yong Wang、Xiao-Shui Peng、Henry N. C. Wong
DOI:10.1021/acs.joc.8b00510
日期:2018.6.15
An efficient ligand-free iron-catalyzedcross-couplingreaction involving alkenyllithium and vinyl iodides was developed to form diene species in moderate to good yields. This new iron-catalyzedcross-couplingreaction provides a mild, inexpensive, and environmentally friendly avenue toward synthesis of diversified diene derivatives.
Synthesis of 2- and 2,3-Substituted Pyrazolo[1,5-<i>a</i>]pyridines: Scope and Mechanistic Considerations of a Domino Direct Alkynylation and Cyclization of <i>N</i>-Iminopyridinium Ylides Using Alkenyl Bromides, Alkenyl Iodides, and Alkynes
作者:James J. Mousseau、James A. Bull、Carolyn L. Ladd、Angélique Fortier、Daniela Sustac Roman、André B. Charette
DOI:10.1021/jo201303x
日期:2011.10.21
Direct functionalization and tandem processes have both received considerable recent interest due to their cost and time efficiency. Herein we report the synthesis of difficult to obtain 2-substituted pyrazolo[1,5-a]pyridines through a tandem palladium-catalyzed/silver-mediated elimination/direct functionalization/cyclization reaction involving N-benzoyliminopyridinium ylides. As such, these biologically important molecules are prepared in an efficient, high-yielding manner, only requiring a two-step sequence from pyridine. Aryl-substituted alkenyl bromides and iodides are effective ylide coupling partners. Mechanistic studies led to the use of terminal alkynes, which extended the scope of the reaction to include alkyl substitution on the unsaturated reactive site. The optimization, scope, and mechanistic considerations of the process are discussed.
Bull, James A.; Mousseau, James J.; Charette, Andre B., Organic Letters, 2008, vol. 10, # 23, p. 5484 - 5488
作者:Bull, James A.、Mousseau, James J.、Charette, Andre B.