Record number :
Title of article :
Ligand effect of bulky 2,2-dialkyl-1-phosphaethenes on Au-catalyzed cycloisomerization of 1,6-enynes and lactonization of pent-4-ynoic acids
Author/Authors :
Shigekazu Ito، نويسنده , , Shuhei Kusano، نويسنده , , Noboru Morita، نويسنده , , Koichi Mikami، نويسنده , , Masaaki Yoshifuji، نويسنده ,
Issue Information :
دوفصلنامه با شماره پیاپی سال 2010
Pages :
From page :
To page :
Abstract :
2,2-Dimethyl- and 2-benzyl-2-methyl-1-(2,4,6-tri-tert-butylphenyl)-1-phosphaethenes were employed as ligand of mononuclear chlorogold(I) complexes, which catalyzed cycloisomerization of 1,6-enyne affording vinylcyclopentene exclusively in the absence of silver co-catalyst. The reaction mechanisms are discussed based on DFT calculations. In addition to the cycloisomerization, the phosphaalkene–chlorogold(I) complexes catalyzed cyclization of pent-4-ynoic acids providing γ-methylene-γ-lactones under basic conditions.
Keywords :
Gold catalysts , phosphaalkenes , Steric protection , Enyne cyclization , ?-Lactones
Journal title :
Journal of Organometallic Chemistry
Link To Document :