- Thiocyanation of aromatic and heteroaromatic compounds with 1-Chloro-1,2-benziodoxol-3-(1H)-one and (Trimethylsilyl)isothiocyanate
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Thiocyanation of aromatic compounds has been investigated using the combination of 1-chloro-1,2-benziodoxol-3-(1H)-one (1) and (trimethylsilyl)isothiocyanate (TMSNCS). The reaction with electron rich aromatic compounds proceeded smoothly to provide the th
- Ito, Yuta,Touyama, Akihiro,Uku, Minako,Egami, Hiromichi,Hamashima, Yoshitaka
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p. 1015 - 1018
(2019/09/12)
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- For the production of sulfur [...] hydrocarbon or heteroaromatic hydrocarbon compound and its preparation method (by machine translation)
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The invention discloses a trifluoro-methylthio arene or azacalixarene compound and a preparation method thereof. The preparation method of the trifluoro-methylthio arene or azacalixarene compound comprises the following steps: in an organic solvent, carrying out substitution reaction on a compound shown in a formula I and nitrogen-trifluoro-methylthio saccharin shown in a formula II in presence of a catalyst, so that a compound shown in a formula III is obtained. The preparation method of the trifluoro-methylthio arene or azacalixarene compound has the advantages that reaction materials can be easily controlled to be in single substitution, toxicity is low, and environmental protection is realized; meanwhile, application range of substrate is wide, equipment requirement is low, and operation is simple. The general formula (I), the general formula (II) and the formula (III) are described in the specification.
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Paragraph 0068; 0069; 0070; 0115; 0116
(2018/09/02)
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- Sandmeyer-Type Trifluoromethylthiolation and Trifluoromethylselenolation of (Hetero)Aromatic Amines Catalyzed by Copper
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Aromatic and heteroaromatic diazonium salts were efficiently converted into the corresponding trifluoromethylthio- or selenoethers by reaction with Me4NSCF3 or Me4NSeCF3, respectively, in the presence of catalytic amounts of copper thiocyanate. These Sandmeyer-type reactions proceed within one hour at room temperature, are applicable to a wide range of functionalized molecules, and can optionally be combined with the diazotizations into one-pot protocols.
- Matheis, Christian,Wagner, Victoria,Goossen, Lukas J.
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supporting information
p. 79 - 82
(2016/01/25)
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- Iron-Catalyzed Decarboxylation of Trifluoroacetate and Its Application to the Synthesis of Trifluoromethyl Thioethers
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Nucleophilic CF3 has been generated by decarboxylation of potassium trifluoroacetate, arguably the most easy-to-handle, inexpensive, and sustainable source of trifluoromethyl groups. Simple iron(II) chloride catalyzes the decarboxylation as well as a subsequent trifluoromethylation of organothiocyanates, resulting in a straightforward synthesis of trifluoromethyl thioethers. The KCN byproduct is absorbed by iron(II) with formation of nontoxic potassium hexacyanoferrate. An analogous trifluoromethylation of aldehydes with trifluoroacetate underlines the synthetic potential of such iron-catalyzed decarboxylative trifluoromethylations.
- Exner, Benjamin,Bayarmagnai, Bilguun,Jia, Fan,Goossen, Lukas J.
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p. 17220 - 17223
(2016/01/25)
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- Synthesis of Aryl Tri- and Difluoromethyl Thioethers via a C H-Thiocyanation/Fluoroalkylation Cascade
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An AlCl3-catalyzed C H thiocyanation was discovered and combined with a Langlois-type trifluoromethylation to afford aryl trifluoromethyl thioethers directly from arenes, N-thiocyanatosuccinimide (NTS) and Ruppert-Prakash reagent. An analogous combination with a copper-mediated difluoromethylation gives access to aryl difluoromethyl thioethers. Both processes proceed with exceptional regioselectivity for the most electron-rich, sterically least hindered position of the arene. The sulfur and fluoroalkyl groups originate from different sources, so that the use of expensive, preformed fluoroalkylthiolation reagents is avoided. Perfectly formed: An AlCl3-catalyzed C H thiocyanation was combined with a Langlois-type trifluoromethylation to afford aryl trifluoromethyl thioethers directly from arenes, N-thiocyanatosuccinimide, and TMS-CF3 (see scheme). An analogous combination of the thiocyanation with a copper-mediated difluoromethylation gives access to aryl difluoromethyl thioethers. The sulfur and fluoroalkyl groups originate from different sources, so that preformed fluoroalkylthiolation reagents are avoided.
- Jouvin, Kévin,Matheis, Christian,Goossen, Lukas J.
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supporting information
p. 14324 - 14327
(2015/10/05)
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- Electrophilic aromatic trifluoromethylthiolation with the second generation of trifluoromethanesulfenamide
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Direct trifluoromethylthiolation of various aromatic and heteroaromatic compounds, variously substituted, can be performed with the second generation of trifluoromethanesulfenamide via a 'Friedel-Crafts-like reaction'. This reaction requires mild conditions with a catalytic amount of protic or Lewis acid. Good results have been obtained, even with aromatic compounds bearing deactivating substituents.
- Alazet, Sébastien,Billard, Thierry
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supporting information
p. 76 - 78
(2015/02/02)
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- Electrophilic aromatic trifluoromethylthiolation with the second generation of trifluoromethanesulfenamide
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Direct trifluoromethylthiolation of various aromatic and heteroaromatic compounds, variously substituted, can be performed with the second generation of trifluoromethanesulfenamide via a 'Friedel-Crafts-like reaction'. This reaction requires mild conditions with a catalytic amount of protic or Lewis acid. Good results have been obtained, even with aromatic compounds bearing deactivating substituents.
- Alazet, Sbastien,Billard, Thierry
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supporting information
(2015/02/18)
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- Lewis acid-catalyzed electrophilic trifluoromethylthiolation of (Hetero)arenes
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(N-Trifluoromethylthio)saccharin has been applied as an electrophilic trifluoromethylthiolating reagent for a broad scope of heteroarenes, electron-donating group (EDG)-activated benzenes, and several electron-rich olefins. Iron(III) and gold(III) catalysts showed complementary activity for different substrates.
- Wang, Qiang,Qi, Zisong,Xie, Fang,Li, Xingwei
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supporting information
p. 355 - 360
(2015/03/05)
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- N-trifluoromethylthiosaccharin: An easily accessible, shelf-stable, broadly applicable trifluoromethylthiolating reagent
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A new, electrophilic trifluoromethylthiolating reagent, N-trifluoromethylthiosaccharin, was developed and can be synthesized in two steps from saccharin within 30minutes. N-trifluoromethylthiosaccharin is a powerful trifluoromethylthiolating reagent and allows the trifluoromethylthiolation of a variety of nucleophiles such as alcohols, amines, thiols, electron-rich arenes, aldehydes, ketones, acyclic β-ketoesters, and alkynes under mild reaction conditions. 'Sacch'ed out: A new, electrophilic trifluoromethylthiolating reagent, N-trifluoromethylthiosaccharin (1) can be synthesized in two steps from saccharin within 30minutes. The reagent 1 allows the trifluoromethylthiolation of a variety of nucleophiles such as alcohols, amines, thiols, electron-rich arenes, aldehydes, ketones, acyclic β-ketoesters, and alkynes under mild reaction conditions.
- Xu, Chunfa,Ma, Bingqing,Shen, Qilong
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supporting information
p. 9316 - 9320,5
(2014/10/15)
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- Sandmeyer trifluoromethylthiolation of arenediazonium salts with sodium thiocyanate and Ruppert-Prakash reagent
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In the presence of copper thiocyanate, sodium thiocyanate and the inexpensive, easy-to-use trifluoromethylating reagent Me3Si-CF 3, diazonium salts are smoothly converted into the corresponding aryl trifluoromethyl thioethers. Combin
- Danoun, Gregory,Bayarmagnai, Bilguun,Gruenberg, Matthias F.,Goossen, Lukas J.
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p. 1312 - 1316
(2014/03/21)
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- A mild and fast photocatalytic trifluoromethylation of thiols in batch and continuous-flow
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S-CF3 bonds are important structural motifs in various pharmaceutical and agrochemical compounds. However, their preparation remains a major challenge in synthetic organic chemistry. Here, we report the development of a mild and fast photocatalytic trifluoromethylation of thiols. The combination of commercially available Ru(bpy)3Cl2, visible light and inexpensive CF3I gas proved to be an efficient method for the direct trifluoromethylation of thiols. The protocol is demonstrated on a wide range of aromatic, hetero-aromatic and aliphatic substrates in both batch and continuous microflow (32 examples, 52-98% yield). Process intensification through continuous microflow application resulted in a 15-fold increase in production rate (0.25 mmol min-1) due to improved gas-liquid mass transfer, enhanced irradiation as well as convenient handling of the gaseous CF3 source. Furthermore, the efficiency of the flow process allowed to reduce the amount of CF3I (1.1 equivalent) to reach full conversion. This journal is
- Straathof, Natan J. W.,Tegelbeckers, Bart J. P.,Hessel, Volker,Wang, Xiao,Nol, Timothy
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p. 4768 - 4773
(2015/01/09)
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- Process for preparing aryl trifluoromethylsulfides
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Trifluoromethylthiocopper, formed in situ by the reaction of bis-(trifluoromethylthio)mercury with copper, reacts with aromatic bromides and iodides to give aryl trifluoromethyl sulfides.
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