Reactivity Switch Enabled by Counterion: Highly Chemoselective Dimerization and Hydration of Terminal Alkynes
作者:Caixia Xu、Weiyuan Du、Yi Zeng、Bin Dai、Hao Guo
DOI:10.1021/ol403684a
日期:2014.2.7
A counterion-controlled reactivity tuning in Pd-catalyzed highly chemoselective and regioselective dimerization and hydration of terminalalkynes is reported. The use of acetate as counterion favors the formation of an alkenyl alkynyl palladium intermediate which forms hitherto less reported 1,3-diaryl-substituted conjugated enynes after reductive elimination. Using chloride, which is a better leaving
Molecules for intramolecular recognition. Synthesis and structures of diaryl- and arylnaphthylethynes
作者:Kevin L. Evans、Philippe Prince、Enoch T. Huang、Keisha R. Boss、Richard D. Gandour
DOI:10.1016/s0040-4039(00)97162-4
日期:1990.1
While synthesizing models for intramolecular recognition, a simple and efficient method for forming terminal arylethynes was developed and palladium-catalyzed coupling chemistry of alkynes with either aryl iodides or aryl triflates was used to form crowded disubstituted alkynes.
EVANS, KEVIN L.;PRINCE, PHILIPPE;HUANG, ENOCH T.;BOSS, KEISHA R.;GANDOUR,+, TETRAHEDRON LETT., 31,(1990) N7, C. 6753-6756
作者:EVANS, KEVIN L.、PRINCE, PHILIPPE、HUANG, ENOCH T.、BOSS, KEISHA R.、GANDOUR,+
DOI:——
日期:——
Carboxylate Switch between Hydro- and Carbopalladation Pathways in Regiodivergent Dimerization of Alkynes
作者:Olga V. Zatolochnaya、Evgeniy G. Gordeev、Claire Jahier、Valentine P. Ananikov、Vladimir Gevorgyan
DOI:10.1002/chem.201402809
日期:2014.7.28
regiodivergent palladium‐catalyzed dimerization of terminalalkynes is presented. Employment of N‐heterocyclic carbene‐based palladium catalyst in the presence of phosphine ligand allows for highly regio‐ and stereoselective head‐to‐head dimerization reaction. Alternatively, addition of carboxylate anion to the reaction mixture triggers selective head‐to‐tail coupling. Computational studies suggest that reaction