S-, N-, and Se-Difluoromethylation Using Sodium Chlorodifluoroacetate
作者:Vaibhav P. Mehta、Michael F. Greaney
DOI:10.1021/ol402370f
日期:2013.10.4
thiols is reported using chlorodifluoroacetate as the difluoromethylating agent. This cheap reagent undergoes smooth decarboxylation at 95 °C to afforddifluorocarbene, which can be trapped with a variety of aromatic and heteroaromatic thiols. The reaction is also effective for the difluoromethylation of heterocyclic nitrogen compounds and phenylselenol.
Visible light-promoted difluoromethylthiolation of aryldiazonium salts
作者:Wengui Wang、Shuxiang Zhang、Huaiqing Zhao、Shoufeng Wang
DOI:10.1039/c8ob02431f
日期:——
Difluoromethylthiolation of aryldiazoniumsalts under photocatalytic conditions with a shelf-stable, easily prepared and inexpensive reagent, PhSO2SCF2H was described. A variety of difluoromethylthioethers were obtained utilizing aryldiazoniumsalts containing different functional groups. Aryldiazoniumsalts with a heteroarene moiety were tolerated. Fluorescence quenching experiments indicated that
Improvement of the synthesis of aryl difluoromethyl ethers and thioethers by using a solid-liquid phase-transfer technique
作者:Bernard R. Langlois
DOI:10.1016/s0022-1139(00)81548-1
日期:1988.11
A new solid-liquid phase-transfer technique has been used to synthesize aryldifluoromethyl ethers and thioethers. Phenols (or thiophenols) and chlorodifluoromethane, dissolved in a cheap aprotic solvent of low polarity, are contacted with solid sodium hydroxide in the presence of a catalytic amount of tris-(3,6-dioxaheptyl)amine. The work-up of the reaction mixtures is very simple. Although yields
Procédé de préparation de perhalogénoalkylthioéthers
申请人:RHONE-POULENC SPECIALITES CHIMIQUES
公开号:EP0117780A1
公开(公告)日:1984-09-05
L'invention concerne un procédé de préparation de perhalogénoalkylthioéthers, caractérisé en ce que l'on fait réagir un thiophénate alcalin avec un composé de formule:
dans laquelle X1 représente le chlore ou le brome et X2 représente le chlore, le fluor, le radical CF3, le radical CF2CI ou le radical CFCI2 quand X1 représente le chlore, X2 ne peut représenter ni le fluor ni le radical CF2CI, dans un solvant aprotique polaire non nitré sous une pression supérieure à 1 bar.
Les produits obtenus sont utiles comme intermédiaires de synthèse de composés ayant une activité pharmaceutique ou phytosanitaire.
A Route to α-Fluoroalkyl Sulfides from α-Fluorodiaroylmethanes
作者:Ya-mei Lin、Wen-bin Yi、Wan-zhao Shen、Guo-ping Lu
DOI:10.1021/acs.orglett.5b03654
日期:2016.2.5
alpha,alpha-Difluorodiaroylmethane can be used as a nucleophilic difluoromethylation reagent for generating alpha-thioaryl-alpha,alpha-difluoroacetophenones ((ArCOCF2SAr)-C-1) and difluoromethylthiolated arenes (ArSCF2H) under transition-metal-free conditions. The reaction selectivity is mainly dependent on temperature. The method has also been extended to the synthesis of alpha-thioaryl-alpha-monofluoroacetophenones using alpha-monofluorodibenzoylmethane. Moreover, the benzoyl cation derived from alpha,alpha-difluorodibenzoylmethane can react with nucleophiles to afford the desired products in a one-pot process.