Synthesis of β-sulfanyl ketones via a tandem rearrangement-conjugate addition reaction catalyzed by a Re(V)-oxo complex
作者:Alyson E. Garst、Alexandra D. Badiceanu、Kristine A. Nolin
DOI:10.1016/j.tetlet.2012.11.047
日期:2013.2
A method for synthesizing β-sulfanyl ketones via a tandem rearrangement and conjugate addition reaction has been developed. This methodology provides access to a range of β-sulfanyl ketones through the rearrangement of propargyl alcohols to the corresponding enones followed by the conjugate addition of unactivated thiols. The one-pot, tandem transformation is catalyzed by ReOCl3(OPPh3)(S(CH3)2) affording
Synthesis of Highly Substituted γ-Butyrolactones by a Gold-Catalyzed Cascade Reaction of Benzyl Esters
作者:Maria Camila Blanco Jaimes、Alexander Ahrens、Daniel Pflästerer、Matthias Rudolph、A. Stephen K. Hashmi
DOI:10.1002/chem.201402524
日期:2015.1.2
3‐butynoic acids in a gold‐catalyzed cyclization/rearrangement cascadereaction provided 3‐propargyl γ‐butyrolactones with the alkene and the carbonyl group not being conjugated. Crossover experiments showed that the formation of the new CC bond is an intermolecular process. Initially propargylic–benzylic esters were used, but alkyl‐substituted benzylic esters worked equally well. In the case of the propargylic–benzylic
Rhenium does the job! A readily available rhenium complex efficiently catalyzed the direct Meyer–Schuster‐like rearrangement of different alkyl‐ and aryl‐substituted propargylic secondary and tertiary alcohols to the corresponding α,β‐unsaturated compounds, which were produced with virtually complete E stereoselectivity. The reaction proceeded under neutral conditions and no racemization of potentially
Microwave-assisted InCl3-catalyzed Meyer–Schuster rearrangement of propargylic aryl carbinols in aqueous media: a green approach to α,β-unsaturated carbonyl compounds
作者:Victorio Cadierno、Javier Francos、José Gimeno
DOI:10.1016/j.tetlet.2009.06.040
日期:2009.8
A novel, efficient, simple and environmentally benign protocol for the Meyer–Schuster isomerization of propargylic aryl carbinols into α,β-unsaturatedcarbonylcompounds has been developed using catalytic amounts of InCl3, pure water as the solvent, and microwave irradiation as the heating source.
Regioselective Rh-Catalyzed Hydroformylation of 1,1,3-Trisubstituted Allenes Using BisDiazaPhos Ligand
作者:Josephine Eshon、Clark R. Landis、Jennifer M. Schomaker
DOI:10.1021/acs.joc.7b01140
日期:2017.9.15
The efficient hydroformylation of 1,1,3-trisubstituted allenes is accomplished with low loadings of a Rh catalyst supported by a BisDiazaPhos (BDP) ligand. The ligand identity is key to achieving high regioselectivity, while the mild reaction conditions minimize competing isomerization and hydrogenation to produce β,γ-unsaturated aldehydes and their derivatives in excellent yields.