Aryl Radical Enabled, Copper-Catalyzed Sonogashira-Type Cross-Coupling of Alkynes with Alkyl Iodides
作者:Xiaojun Zeng、Chao Wang、Wenhao Yan、Jian Rong、Yanshan Song、Zhiwei Xiao、Aijie Cai、Steven H. Liang、Wei Liu
DOI:10.1021/acscatal.2c05901
日期:2023.2.17
Despite the success of Sonogashira coupling for the synthesis of arylalkynes and conjugated enynes, the engagement of unactivated alkyl halides in such reactions remains historically challenging. We report herein a strategy that merges Cu-catalyzed alkyne transfer with the aryl radical activation of carbon–halide bonds to enable a general approach for the coupling of alkyl iodides with terminal alkynes
Gold-Catalyzed Homo/Heterodimerization of Terminal Alkynes Facilitated by Metal–Ligand Cooperation
作者:Xuan Wu、Liming Zhang
DOI:10.1021/acs.orglett.4c01872
日期:2024.7.12
dimerization of terminal alkynes is achieved under mild reaction conditions and in excellent yields. In addition to homodimerizations, heterodimerizations between TBS acetylene and a range of terminal alkynes were realized using the syringe pump technique. The reaction tolerates various functional groups. The rate acceleration experienced in the reactions is enabled by metal–ligand cooperation. A binaphthyl-2-ylphosphine
Palladium(0)-Catalyzed Synthesis of Chiral Ene-allenes Using Alkenyl Trifluoroborates
作者:Gary A. Molander、Erin M. Sommers、Sharon R. Neufeldt
DOI:10.1021/jo052201x
日期:2006.2.17
[GRAPHICS]Enantioenriched allenes serve as chiral transfer reagents, making them attractive synthetic targets. Herein, the synthesis of enantioenriched allenes utilizing a Pd(O)-catalyzed cross-coupling reaction of propargylic carbonates and phosphates with alkenyl trifluoroborates is reported. Di-, tri-, and tetrasubstituted allenes were synthesized in moderate to high optical yields. Several racemic allenes possessing various functional groups were also synthesized.