Tributyltin Hydride as a Selective Reducing Agent for Aryl Enones
作者:Marie Krafft、Dinesh Vidhani、John Cran
DOI:10.1055/s-0030-1261231
日期:2011.10
Aryl enones undergo selective 1,4-reduction to the correspondingsaturated ketones with two equivalents of tributyltinhydride inthe presence of a wide range of other potentially reducible functionalgroups, including alkyl enone. Additionally during this investigationreductive cyclization of bisenones to give five- and six-memberedcarbocycles via an α,β-coupling process was observed.
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
Thermodynamic epimeric equilibration and crystallisation-induced dynamic resolution of lobelanine, norlobelanine and related analogues
作者:Z. Amara、G. Bernadat、P.-E. Venot、P. Retailleau、C. Troufflard、E. Drège、F. Le Bideau、D. Joseph
DOI:10.1039/c4ob01787k
日期:——
β-aminoketone subunit, lobelanine is prone to self-catalyze mutarotation in solution. Through the synthesis of original lobelanine analogues, we studied the influence of (i) the size of the central heterocycle, (ii) the bulkiness of the nitrogen protecting group, and (iii) the phenacyl arm substituent on the thermodynamic equilibrium and its displacement by crystallisation-induced dynamic resolution
Access to Highly Functionalized Sulfonated Cyclopentanes by Acid-Promoted Rauhut-Currier Reaction with Sulfinamides
作者:Nicolas Gigant、Emmanuelle Drège、Pascal Retailleau、Delphine Joseph
DOI:10.1002/chem.201502816
日期:2015.10.26
acid‐mediated cascade reaction induced by conjugate addition of sulfinamides to dienediones has been developed. This highly efficient Rauhut–Currierreaction enables the rapid, high‐yielding construction of sulfonatedcyclopentanes with three contiguous stereogenic centers in a single operation starting from simple sulfinamides. This process constitutes the first example of sulfinamide‐promoted cycloisomerization
A Cooperative Hydrogen-Bond-Promoted Organophotoredox Catalysis Strategy for Highly Diastereoselective, Reductive Enone Cyclization
作者:Matthias Neumann、Kirsten Zeitler
DOI:10.1002/chem.201204573
日期:2013.5.27
Metal‐free cooperation: The cooperative combination of Eosin Y as a photoredox catalyst with organocatalytic thiourea allows for the highlydiastereoselective construction of trans‐1,2‐cycloalkanes and heterocycles. This new efficient, cooperativeorganophotoredox/organocatalysis protocol presents a valuable alternative to metal‐based photoredox approaches and is the first example of combining photoredox