Transmetalation of Alkylzirconocenes in Copper-Catalyzed Alkyl-Alkynyl Cross-Coupling Reactions
作者:Kiran Indukuri、Olivier Riant
DOI:10.1002/adsc.201700164
日期:2017.7.17
simple copper‐catalyzed alkyl–alkynyl cross‐coupling strategy has been developed using the reaction between alkynyl bromides and alkylzirconocenes. The alkylzirconocenes were generated in situ via regioselective addition of Schwartz's reagent (ZrCp2HCl) on to alkenes. The reaction has a broad scope, a range of functionalized bromoalkynes and alkylzirconium reagents were successfully coupled, resulting in
Visible light-driven cross-coupling reactions of alkyl halides with phenylacetylene derivatives for C(sp<sup>3</sup>)–C(sp) bond formation catalyzed by a B<sub>12</sub> complex
Visible light-driven cross-couplingreactions of alkylhalides with phenylacetylene and its derivatives catalyzed by the cobalamin derivative (B12) with the [Ir(dtbbpy)(ppy)2]PF6 photocatalyst at room temperature are reported. The robust B12 catalyst and Ir photocatalyst provided high turnover numbers of over 33 000 for the reactions.
Formation of C(sp<sup>2</sup>)Boronate Esters by Borylative Cyclization of Alkynes Using BCl<sub>3</sub>
作者:Andrew J. Warner、James R. Lawson、Valerio Fasano、Michael J. Ingleson
DOI:10.1002/anie.201505810
日期:2015.9.14
BCl3 is an inexpensive electrophile which induces the borylativecyclization of a wide range of substituted alkynes to regioselectively form polycycles containing synthetically versatile C(sp2)boronateesters. It proceeds rapidly, with good yields and is compatible with a range of functional groups and substitution patterns. Intermolecular 1,2‐carboboration of alkynes is also achieved usingBCl3 to
Sulfur-Mediated Electrophilic Cyclization of Aryl-Substituted Internal Alkynes
作者:Zhong Zhang、Pan He、Hongguang Du、Jiaxi Xu、Pingfan Li
DOI:10.1021/acs.joc.9b00136
日期:2019.4.5
A sulfur-mediated electrophiliccyclization reaction of aryl-tethered internal alkynes has been developed. Triflic anhydride-activated sulfoxides induced the electrophiliccyclization and then demethylation with triethylamine in one pot, affording 3-sulfenyl-1,2-dihydronaphthalenes and related types of products in yields of ≤96%.