(2-Fluoroallyl)pyridinium tetrafluoroborates: novel fluorinated electrophiles for Pd-catalyzed allylic substitution
作者:Angelina Yu. Bobrova、Maxim A. Novikov、Yury V. Tomilov
DOI:10.1039/d1ob00567g
日期:——
An efficient two-step approach to 2-fluoroallyl amines was developed that involves the synthesis of (2-fluoroallyl)pyridinium tetrafluoroborates from readily available gem-bromofluorocyclopropanes and the application of the former as novel and stable 2-fluoroallyl electrophiles for Pd-catalyzed allylic substitution.
(2-Fluoroallyl)palladium complexes as intermediates in Pd-catalyzed Tsuji-Trost 2-fluoroallylations: Synthesis and reactivity
作者:Angelina Yu. Bobrova、Maxim A. Novikov、Igor A. Mezentsev、Yury V. Tomilov
DOI:10.1016/j.jfluchem.2020.109553
日期:2020.8
The first examples of π-(2-fluoroallyl)palladiumcomplexes were synthesized, isolated and characterized including chloride dimers, neutral chloride or cationic triflate complexes bearing PPh3 or SPhos as the ligands. Preliminary reactivity patterns indicating strong dependence of the chemoselectivity on “hardness” of the nucleophile and the ligand type were studied.
Copper-catalyzed ligand free ring-opening amination of gem-fluorohalocyclopropanes – An efficient route toward 2-fluoroallylamines
作者:Maxim A. Novikov、Yaroslav A. Ibatov、Nikolai V. Volchkov、Maria B. Lipkind、Sergei E. Semenov、Oleg M. Nefedov
DOI:10.1016/j.jfluchem.2017.01.001
日期:2017.2
Ring-opening amination of gem-chlorofluoro- and gem-bromofluorocyclopropanes with secondary alkyl, arylamines or hydroxylamines catalyzed by copper(I) or copper(II) compounds with no additional ligands affords tertiary 2-fluoroallylamines or hydroxylamines in moderate to excellent yields. The reaction pathway involves isomerization of gem-fluorohalocyclopropanes to 2-fluoroallyl halides followed by
The solvolysis rates of p-(cis- or trans-2-substituted cyclopropyl)-α-methylbenzyl chlorides including electron-donating and electron-attracting substituents relative to a hydrogen substituent were measured in 80% aqueous acetone. The trans isomers were more reactive than the corresponding cis derivatives where cyclopropyl and phenyl groups could not get a most favorable “bisected” conformation for
A novel and effective approach to 4-fluoropyrimidines
作者:Kseniya N. Sedenkova、Elena B. Averina、Yuri K. Grishin、Tamara S. Kuznetsova、Nikolay S. Zefirov
DOI:10.1016/j.tetlet.2013.11.070
日期:2014.1
4-fluoropyrimidine 1-oxides, obtained via three-component heterocyclization, was studied under various reduction conditions. An effective preparative method for the synthesis of 4-fluoropyrimidines from readily available starting materials was elaborated. 4-Fluoro-substituted tetrahydroquinazolines and tetrahydroquinazoline N-oxides were demonstrated to be highly reactive in aromatic nucleophilic substitution.