Catalytic Asymmetric Enyne Addition to Aldehydes and Rh(I)-Catalyzed Stereoselective Domino Pauson–Khand/[4 + 2] Cycloaddition
作者:Wei Chen、Jia-Hui Tay、Jun Ying、Xiao-Qi Yu、Lin Pu
DOI:10.1021/jo3026065
日期:2013.3.15
propargylic alcohols prepared from the catalyticasymmetric enyne addition to aliphatic aldehydes are used to prepare a series of opticallyactive trienynes. In the presence of a catalytic amount of [RhCl(CO)2]2 and 1 atm of CO, the opticallyactive trienynes undergo highly stereoselective domino Pauson–Khand/[4 + 2] cycloaddition to generate opticallyactive multicyclic products. The Rh(I) catalyst
Heteropoly Acid-catalyzed Direct Substitution of 2-Propynyl Alcohols with Sulfonamides
作者:J. S. Yadav、B. V. Subba Reddy、T. Srinivasa Rao、B. Bala. M. Krishna、G. G. K. S. Narayana Kumar
DOI:10.1246/cl.2007.1472
日期:2007.12.5
Directsubstitution of the hydroxygroup in 2-propynyl alcohols with sulfonamides has been achieved using 5 mol % of phosphomolybdic acid supported on silica gel (PMA/SiO2) under mild reaction cond...
Chemo- and regioselective reductive deoxygenation of 1-en-4-yn-ols into 1,4-enynes through FeF<sub>3</sub> and TfOH co-catalysis
作者:Zonglian Yang、Rapolu Kiran Kumar、Peiqiu Liao、Zhaohong Liu、Xingqi Li、Xihe Bi
DOI:10.1039/c5cc10518h
日期:——
We report chemo- and regioselective direct reductive deoxygenation of 1-en-4-yn-3-ols into 1,4-enynes through FeF3 and TfOH cooperative catalysis under NBSH-mediated conditions.
Indium(III) Bromide Catalyzed Rapid Propargylation of Heteroaromatic Systems by α-Aryl-Substituted Propargyl Alcohols
作者:J. Yadav、B. Reddy、K. Rao、G. Kumar
DOI:10.1055/s-2007-990797
日期:2007.10
pyrrole, and furan underwent smooth coupling with propargylic alcohols in the presence of 10 mol% of indium(III) bromide under mild conditions to furnish exclusively propargylated heterocycles in excellent yields and high regioselectivity. The use of indium(III) bromide makes this procedure simple, convenient, and practical. The hydroxygroups of the propargylic alcohols were simply replaced by the nucleophiles
Indoles undergo smooth alkylation with propargylic alcohols in the presence of 10 mol % of scandium triflate under mild conditions to produce 3-propargylated indoles in excellent yields with high selectivity. (C) 2007 Published by Elsevier Ltd.