Ligand effect of bulky 2, 2-dialkyl-1-phosphaethenes on Au-catalyzed cycloisomerization of 1, 6-enynes and lactonization of pent-4-ynoic acids

…, S Kusano, N Morita, K Mikami, M Yoshifuji

Index: Ito, Shigekazu; Kusano, Shuhei; Morita, Noboru; Mikami, Koichi; Yoshifuji, Masaaki Journal of Organometallic Chemistry, 2010 , vol. 695, # 2 p. 291 - 296

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Citation Number: 23

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 ...