Stereoselective One-Pot Sequential Dehydrochlorination/<i>trans</i>
-Hydrofluorination Reaction of β-Chloro-α,β-unsaturated Aldehydes or Ketones: Facile Access to (<i>Z</i>
)-β-Fluoro-β-arylenals/β-Fluoro-β-arylenones
作者:Jingli Zhang、Liran Liu、Junxin Duan、Lianghu Gu、Bifeng Chen、Taolei Sun、Yuefa Gong
DOI:10.1002/adsc.201700981
日期:2017.12.19
high potential as a fluorinated synthon in organic synthesis. However, control of the Z/E stereoselectivity of multi‐substituted monofluoroalkene products in one‐pot reactions still remains a challenge. An unprecedented one‐pot approach for the highly regio‐ and stereoselective preparation of functionalized (Z)‐β‐monofluoro tri‐substituted alkenesfrom readily available β‐chloro‐α,β‐unsaturated aldehydes
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
Synthesis of β-Fluoro-α,β-Unsaturated Amides from the Fragmentation of Morpholine 3,3,3-Trifluoropropanamide by Grignard Reagents
作者:Amna T. Adam、Frank R. Fronczek、David A. Colby
DOI:10.1021/acs.orglett.0c00599
日期:2020.4.3
hydrolytic enzymes in vivo. Currently, α-fluoro-α,β-unsaturated carbonyl compounds are readily accessible via general synthetic methods; however, β-fluoro-α,β-unsaturated carbonyl groups are more challenging to construct. To address this need, we have designed a reagent, morpholine 3,3,3-trifluoropropanamide, that creates (E)-β-fluoro-α,β-unsaturatedamides upon the addition of many commonly used Grignard
The difunctionalization of terminal alkynes was achieved with silver fluoride (AgF) and N-bromosuccinimide (NBS) as halogen sources. The presence of the halide moiety greatly enhances the reactivity of the vinyl fluoride compounds that can probably can be transformed into various products that are difficult or even impossible to obtain via direct fluorination. Meanwhile, the monofluoro<.>alkenes were
An unprecedented Pd-catalyzed activation of a CF3 group is reported herein. The key to the success of this reaction is the combination of consecutive β-F elimination and C–Fbond oxidative addition of a trifluoromethyl group. It also represents the first general application of α-trifluoromethyl ketones as building blocks by C–Fbondactivation.