ortho-Acidic aromatic thiols as efficient catalysts of intramolecular Morita–Baylis–Hillman and Rauhut–Currier reactions
作者:Philipp S. Selig、Scott J. Miller
DOI:10.1016/j.tetlet.2010.11.077
日期:2011.4
ortho-Mercaptobenzoic acid and ortho-mercaptophenols were discovered as efficient thiol catalysts of both the intramolecular Morita–Baylis–Hillman (MBH) and Rauhut–Currier (RC) reaction. High reaction rates were achieved under mildly basic, aqueous conditions. The unprecedented catalytic activity of these protic nucleophiles could originate from a Brønsted acid induced destabilization of intermediate
Predicting Counterion Effects Using a Gold Affinity Index and a Hydrogen Bonding Basicity Index
作者:Zhichao Lu、Junbin Han、Otome E. Okoromoba、Naoto Shimizu、Hideki Amii、Cláudio F. Tormena、Gerald B. Hammond、Bo Xu
DOI:10.1021/acs.orglett.7b02829
日期:2017.11.3
We have developed a gold affinity index and hydrogenbondingbasicity index for counterions and have used these indexes to forecast their reactivity in cationic gold catalysis.
Intramolecular Michael reactions of aliphatic aldehyde enolates generated by imidazolium carbenes
作者:Hyoungsu Kim、Seong Rim Byeon、Marina G.D. Leed、Jiyong Hong
DOI:10.1016/j.tetlet.2011.03.008
日期:2011.5
conditions required for the direct generation of aldehyde enolates, intramolecular Michaeladditions of aldehyde enolates to α,β-unsaturated carbonyl compounds have been underexplored for the stereoselective synthesis of carbocyclic compounds. The intramolecular Michael reaction of aldehyde enolates generated by imidazolium carbenes was explored for the synthesis of cyclopentane aldehydes. The imidazolium carbenes