Overman Rearrangement of Fluorinated Allylic Alcohols as a Key Step for the Synthesis of Glycyldecylamide (GDA) Mimics
作者:Günter Haufe、Daniel Ramb
DOI:10.1055/s-0033-1339665
日期:——
O verman rearrangements based on secondary 2-fluoroallylic alcohols were performed to synthesize fluorinated primary allylicamines for the first time. The vinylic fluorine atom dramatically slows down the reactionrate. Long alkyl chain fluorinated allylicamine, which is a mimic of a drug against schizophrenia, was further coupled with Boc-protected phenyl glycine, forming a Gly-Phe peptide mimic
Copper(I)-catalyzed solvolysis of gem-chlorofluoro- and gem-bromofluorocyclopropanes. Preparation of 2-fluoroallylic ethers, esters and alcohols
作者:Maxim A. Novikov、Nikolai V. Volchkov、Maria B. Lipkind、Oleg M. Nefedov
DOI:10.1016/j.jfluchem.2015.09.001
日期:2015.12
Copper(I)-catalyzed solvolysis of gem-chlorofluoro- and gem-bromofluorocyclopropanes in MeOH, NaOAc/AcOH, NaOAc/DMF, HCO2Na/HCO2H or water/dioxane affords 2-fluoroallylic ethers, esters or alcohols in moderate to excellent yields. The reaction pathway involves isomerization of gem-fluorohalocyclopropanes to 2-fluoroallylic halides followed by nucleophilic substitution of a halide onto an O-nucleophile
α-Fluorovinyldiphenylmethylsilane was synthesized in one step from 1,1-difluoroethylene; the TBAF-initiated reaction of the silane with carbonyl compounds smoothly proceeded to give the corresponding α-fluoroallylic alcohols in good yields.
An Efficient Approach for Monofluorination via Highly Regioselective Fluorohydroxylation Reaction of 3-Aryl-1,2-allenes with Selectfluor
作者:Chao Zhou、Jing Li、Bo Lü、Chunling Fu、Shengming Ma
DOI:10.1021/ol702863n
日期:2008.2.1
The internal C-C double bond in 3-aryl-1,2-allenes was highly regioselectively fluorohydroxylated to afford 2-fluoroalken-3-ols in 37-88% yields by using Selectfluor as the electrophilic reagent. The regioselectivity may be determined by the electronic effect, while the reactivity may be controlled by the stabilization effect of the aryl group in the allylic cationic intermediates.
Addition of Nucleophiles to Fluorinated Michael Acceptors
作者:Daniel C. Ramb、Andreas Lerchen、Marvin Kischkewitz、Bernd Beutel、Santos Fustero、Günter Haufe
DOI:10.1002/ejoc.201600088
日期:2016.3
A series of nucleophiles, including primary and secondary amines, primary alcohols, and thiols, as well as diethyl malonate and nitromethane, were added to different fluorinated Michaelacceptors including 2-fluoroalk-1-en-3-ones and 2-fluoro-1-phenylprop-2-en-1-one. The resulting β-substituted α-fluoro ketones were isolated in 34–92 % yield, depending on the substrate and the nucleophile. The best