Palladium-Catalyzed Intramolecular Aminotrifluoromethoxylation of Alkenes
摘要:
The first catalytic trifluoromethoxylation of unactivated alkenes has been developed, in which Pd(CH3CN)(2)Cl-2 was used as catalyst, AgOCF3 as trifluoromethoxide source, and Selectfluor-BF4 as oxidant. A variety of 3-OCF3 substituted piperidines were selectively obtained in good yields. Direct evidence was provided to address the facile reductive elimination of Pe(IV)-OCF3 complex to form sp(3) C-OCF3 bond.
Hydrolytically stable and easy to handle trifluoromethyl triflate was found to be a liquid reservoir of 'masked' difluorophosgene. Anhydrous F(-) sources cleave the S-O bond in trifluoromethyl triflate yielding quantitatively the trifluoromethanolate salts, being useful trifluoromethoxy group carriers. Reaction of trifluoromethanolates with in situ generated from o-trimethylsilylphenyl triflate benzyne leads to (trifluoromethoxy)benzene and fluorobenzene (ratio 85:15). Whereas an addition of trifluoromethanethiolate anion across a triple bond of benzyne leads to [(trifluoromethyl)sulfanyl]benzene solely. (C) 2007 Elsevier Ltd. All rights reserved.
The present invention relates to a process for the preparation of compounds containing CF
3
O groups using compounds containing at least one group Y, in which Y=—Hal, —OSO
2
(CF
2
)
z
F, —OSO
2
C
z
H
2z+1
(z=1-10), —OSO
2
F, —OSO
2
Cl, —OC(O)CF
3
— or —OSO
2
Ar, to a process for the preparation of compounds containing CF
3
O groups using KOCF
3
and/or RbOCF
3
, and to novel compounds containing CF
3
O groups, and to the use thereof.
Quaternary Ammonium Trifluoromethoxide Salts as Stable Sources of Nucleophilic OCF<sub>3</sub>
作者:Josiah J. Newton、Benson J. Jelier、Michael Meanwell、Rainer E. Martin、Robert Britton、Chadron M. Friesen
DOI:10.1021/acs.orglett.0c00099
日期:2020.3.6
methyl ethers provides quaternaryammonium trifluoromethoxide (NR4OCF3) and pentafluoroethoxide (NR4OCF2CF3) salts, respectively, in good yields. The new trifluoromethoxide salts disclosed herein are uniquely stable for extended periods of time in both the solid state and in solution, which complements contemporary reagents. Here we describe the preparation of a range of NR4OCF3 salts, their long-term stability
Silver-mediated direct trifluoromethoxylation of α-diazo esters and ketosteroid was disclosed.
银介导的α-重氮酯和酮类固醇的直接三氟甲氧基化反应被揭示。
Über die Reaktionen von (CH<sub>3</sub>)<sub>4</sub>N<sup>+</sup>I<sup>-</sup>, (CH<sub>3</sub>)<sub>4</sub>
<sub />N<sup>+</sup>ICl<sub>2</sub>
<sup>-</sup>, (CH<sub>3</sub>)<sub>4</sub>N<sup>+</sup>ICl<sub>4</sub>
<sup>-</sup> und (CH<sub>3</sub>)<sub>4</sub>N<sup>+</sup>Cl<sup>-</sup> mit Trifluormethylhypochlorit CF<sub>3</sub>OCl / The Reactions of (CH<sub>3</sub>)<sub>4</sub>N<sup>+</sup>I<sup>-</sup>, ( CH<sub>3</sub>)<sub>4</sub>N<sup>+</sup>ICl<sub>2</sub>
<sup>-</sup>, (CH<sub>3</sub>)<sub>4</sub>N<sup>+</sup>ICl<sub>4</sub>
<sup>-</sup> and (CH<sub>3</sub>)<sub>4</sub>N<sub>+</sub>Cl<sup>-</sup> with Trifluoromethylhypochlorite CF<sub>3</sub>OCl
作者:Rolf Minkwitz、Raimund Bröchler
DOI:10.1515/znb-1997-0317
日期:1997.3.1
CF3OCl have been demonstrated by the reactions with different iodate salts like (CH3)4N+I-, (CH3)4N+ICl2- and (CH3)4N +ICl4- . At -70°C all reactions give hexafluoroiodate(V ) salts IF6- . In contrast, the reaction of CF3OCl with (CH3)4N+Cl+ yields (CH3)4N+OCF3-. The products have been characterized by vibrational and NMR spectra.
Mechanochemical Conversion of Aromatic Amines to Aryl Trifluoromethyl Ethers
作者:Michał Jakubczyk、Satenik Mkrtchyan、Mohanad Shkoor、Suneel Lanka、Šimon Budzák、Miroslav Iliaš、Marek Skoršepa、Viktor O. Iaroshenko
DOI:10.1021/jacs.2c02611
日期:2022.6.15
Increased interest in the trifluoromethoxy group in organic synthesis and medicinal chemistry has induced a demand for new, selective, general, and faster methods applicable to natural products and highly functionalized compounds at a later stage of hit-to-lead campaigns. Applying pyrylium tetrafluoroborate, we have developed a mechanochemical protocol to selectively substitute the aromatic amino group
在有机合成和药物化学中对三氟甲氧基的兴趣日益增加,这引发了对适用于天然产物和高度功能化化合物的新的、选择性的、通用的和更快的方法的需求,这些方法适用于“命中率”活动的后期阶段。应用 pyrylium tetrafluoroborate,我们开发了一种机械化学方案,以选择性地用 OCF 3官能团取代芳族氨基。我们方法的范围包括 31 个环取代苯胺的例子,包括酰胺和磺胺。以优异的产率获得了预期的 S N Ar 产品。所提出的简洁方法为制药行业开辟了通往新化学空间的途径。