Cobalt-Catalyzed Diastereo- and Enantioselective Reductive Allyl Additions to Aldehydes with Allylic Alcohol Derivatives via Allyl Radical Intermediates
enantioenriched homoallylic alcohols with a remarkably broad scope of allyl groups that can be introduced. Mechanistic studies indicated that allyl radical intermediates were involved in this process. These new discoveries establish a new strategy for development of enantioselective transformations through capture of radicals by chiral Co complexes, pushing forward the frontier of Co complexes for enantioselective
Gold-Catalyzed Hydrofluorination of Electron-Deficient Alkynes: Stereoselective Synthesis of β-Fluoro Michael Acceptors
作者:Thomas J. O’Connor、F. Dean Toste
DOI:10.1021/acscatal.8b01341
日期:2018.7.6
The gold(I)-catalyzed, stereoselective hydrofluorination of electron-deficient alkynes with triethylamine trihydrogen fluoride (Et3N·3HF) is described. Fluorinated α,β-unsaturated aldehydes, amides, esters, ketones, and nitriles were isolated in moderate to good yields as single diastereomers. In all but four cases, the (Z)-vinyl fluorides were initially formed in ≥97% diastereoselectivity. This work
Mono-hydrofluorination of electrophilic alkynes by the liquid biphasic CsF–H<sub>2</sub>O–DMF system (DMF = N,N-dimethylformamide)
作者:Alain Gorgues、Dominique Stéphan、Jack Cousseau
DOI:10.1039/c39890001493
日期:——
CsF induces the addition of HF in fair yields to activated acetylenic triple bonds in a DMF–water biphasic medium (DMF = N,N-dimethylformamide); in a homogeneous DMF–water mixture, no addition is observed.
A series of three α‐ and three β‐fluorinated representatives of the family of cinnamate‐derived odorants (cinnamaldehyde (1), cinnamyl alcohol (2), and ethyl cinnamate (3)) as used as fragrance ingredients is described. Olfactive evaluation shows that the fluorinated compounds exhibit a similar odor profile to their parent compounds, but the olfactive detection thresholds are clearly higher. In vitro
Tetrabutylammonium and polymer-supported dihydrogentrifluoride: new hydrofluorinating reagents for electrophilic alkynes
作者:Patrice Albert、Jack Cousseau
DOI:10.1039/c39850000961
日期:——
Tetrabutylammonium and polymer-supporteddihydrogentrifluoride are readily accessible reagents which allow addition of HF to activated carbon–carbon triple bonds, thus leading to functional fluoroalkenes in good yields.