Catalytic [2+2+1] Cross-Cyclotrimerization of Silylacetylenes and Two Alkynyl Esters To Produce Substituted Silylfulvenes
作者:Yu Shibata、Ken Tanaka
DOI:10.1002/anie.201105517
日期:2011.11.11
Three become one: The cationic rhodium(I) complex [Rh(cod)2]BF4 catalyzes the [2+2+1] cross‐cyclotrimerization of silylacetylenes and twoalkynylesters, leading to substitutedsilylfulvenes (see scheme; cod=1,5‐cyclooctadiene). The reductive complexation of the silylfulvene product with RhCl3 in EtOH furnished the corresponding dinuclear electron‐deficient cyclopentadienyl rhodium(III) complex.
(Carboxyalkyl)benzyl Propargyl Ethers as Selective Inhibitors of Leukocyte-Type 12-Lipoxygenases
作者:Gilles Gorins、Lethea Kuhnert、Carl R. Johnson、Lawrence J. Marnett
DOI:10.1021/jm9606047
日期:1996.1.1
A series of (carboxyalkyl)benzyl propargyl ethers was synthesized and tested as inhibitors of 12-lipoxygenase (12-LO) from porcine leukocyte cytosol. Optimum activity was displayed by 3-[4-[(2-tridecynyloxy)methyl]phenyl]propanoic acid. Altering the length of the alkyl side chain attached to the acetylenic group reduced activity. Changing the substitution pattern in the (carboxyalkyl)benzyl group from para to meta or ortho also reduced activity. Analogs in which the triple bond was replaced by a double bond or an allene displayed reduced activity, whereas fully saturated analogs were inactive. High concentrations (10 mu M) of the most potent acetylenic (carboxylalkyl)benzyl ethers did not inhibit human platelet 12-LO, human neutrophil 5-LO, rabbit reticulocyte 15-LO, or soybean 15-LO. Thus, this class of compounds represents the first example of isoform specific LO inhibitors.
Trost, Barry M.; Martinez, Jose A.; Kulawiec, Robert J., Journal of the American Chemical Society, 1993, vol. 115, # 22, p. 10402 - 10403
作者:Trost, Barry M.、Martinez, Jose A.、Kulawiec, Robert J.、Indolese, Adriano F.
DOI:——
日期:——
An Atom-Economic and Selective Ruthenium-Catalyzed Redox Isomerization of Propargylic Alcohols. An Efficient Strategy for the Synthesis of Leukotrienes
作者:Barry M. Trost、Robert C. Livingston
DOI:10.1021/ja804105m
日期:2008.9.10
secondary propargylicalcohols in good yields to provide trans enals and enones exclusively. Readily available indenylbis(triphenylphosphine)ruthenium chloride, in the presence of indium triflate and camphorsulfonic acid, gives the best turnover numbers and reactivity with the broadest range of substrates. Deuterium labeling experiments suggest that the process occurs through propargylic hydride migration