The Catalytic Pauson-Khand Reaction Promoted by A Small Amount of 1,2-Dimethoxyethane or Water
作者:Takumichi Sugihara、Masahiko Yamaguchi
DOI:10.1055/s-1998-1991
日期:1998.12
Various "hard" Lewis bases having less nucleophilic nature promoted the catalytic Pauson-Khand reaction. Among those Lewis bases, 1,2-dimethoxyethane seems to be the most promising promoter and a small amount of water, which is the cheapest reagent, also effectively promoted the cyclization.
Selectivities in Nickel-Catalyzed Hydrocarboxylation of Enynes with Carbon Dioxide
作者:Tao Cao、Zheng Yang、Shengming Ma
DOI:10.1021/acscatal.7b00556
日期:2017.7.7
A three-component hydrocarboxylation of enynes with ZnEt2 and CO2 is realized. Highly selective cyclizative carboxylation of the C–C triple bond was observed. Preliminary mechanistic studies indicated both the concerted cyclometalation mechanism and the stepwise C═C bond-directed carboxylation were possible in this reaction.
Tris(trimethylsilyl)silyl Radical Induced Bicyclization of 1,6-Dienes and 1,6-Enynes Providing 3,3-Bis(trimethylsilyl)-3-silabicyclo[3.3.0]octanes and 3-Silabicyclo[3.3.0]oct-1-enes
Treatment of 1,6-dienes with tris(trimethylsilyl)silane in the presence of Et3B or α,α′-azobis(isobutyronitrile) afforded 3,3-bis(trimethylsilyl)-3-silabicyclo[3.3.0]octanes in addition to monocyclized cyclopentanes. Bicyclization of 1,6-enynes provided the corresponding 3-silabicyclo[3.3.0]oct-1-enes.
Immobilized heterobimetallic Ru/Co nanoparticle-catalyzed Pauson–Khand-type reactions in the presence of pyridylmethyl formate
作者:Kang Hyun Park、Seung Uk Son、Young Keun Chung
DOI:10.1039/b304325h
日期:——
Heterobimetallic Ru/Co nanoparticles, immobilized on charcoal, were synthesized and used as catalysts in the Pauson-Khand-typereaction in the presence of pyridylmethyl formate instead of carbon monoxide; the catalysts were effective for intra- and intermolecular reactions and easily reused without loss of catalytic activity.