Reactions of alkyl 4-hydroxybut-2-ynoates with arenes under superelectrophilic activation with triflic acid or HUSY zeolite: Alternative propargylation or allenylation of arenes, and synthesis of furan-2-ones
Sign Up to like & getrecommendations! Published in 2019 at "Tetrahedron"
DOI: 10.1016/j.tet.2019.130517
Abstract: Abstract Reactions of alkyl 4-aryl(or 4,4-diaryl)-4-hydroxybut-2-ynoates [Ar(H or Ar')(OH)C4–C3≡C2–CO2Alk] with arenes under the action of triflic acid TfOH or HUSY zeolite result in the formation of two main compounds, aryl substituted furan-2-ones or products of… read more here.
Keywords: triflic acid; husy zeolite; furan ones; hydroxybut ynoates ... See more keywords
Triflic acid catalysed regioselective synthesis of substituted naphthalenes by benzannulation of carbonyls with alkynes
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DOI: 10.1016/j.tet.2021.132214
Abstract: Abstract An interesting and facile triflic acid catalysed annulation of α-aryl carbonyls with arylalkynes is presented for the regioselective synthesis of substituted naphthalenes. The annulation reaction involves a sequence of electrophilic attack of carbonyl on… read more here.
Keywords: triflic acid; synthesis substituted; carbonyls; acid catalysed ... See more keywords
Triflic-Acid-Catalyzed Tandem Allylic Substitution–Cyclization Reaction of Alcohols with Thiophenols—Facile Access to Polysubstituted Thiochromans
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DOI: 10.1021/acsomega.8b01305
Abstract: Hitherto inaccessible multisubstituted thiochroman derivatives were constructed via the one-pot reaction of thiophenols with allylic alcohols catalyzed by 0.2 equiv triflic acid under metal-free conditions. A variety of thiochroman derivatives can be obtained by this… read more here.
Keywords: triflic acid; cyclization; reaction; acid catalyzed ... See more keywords
Brønsted acid-catalysed intramolecular hydroamination of unactivated alkenes: metal triflates as an in situ source of triflic acid.
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DOI: 10.1039/c6dt04710f
Abstract: Hydroamination of alkenes or alkynes is one of the most straightforward methods to form C-N bonds and nitrogen-containing heterocycles. A simple Lewis acid Al(OTf)3 was found to be an effective precatalyst for the hydroamination of… read more here.
Keywords: triflic acid; nsted acid; hydroamination unactivated; metal triflates ... See more keywords
Synthesis of Tetraarylmethanes by the Triflic Acid-Promoted Formal Cross-Dehydrogenative Coupling of Triarylmethanes with Arenes
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DOI: 10.1055/s-0036-1588563
Abstract: The formal cross-dehydrogenative coupling of triarylmethanes with arenes promoted by triflic acid and 2,3-dichloro-5,6-dicyano-1,4-benzoquinone is described. This method provides a variety of tetraarylmethane derivatives in good to excellent yields from triarylmethanes that can be readily… read more here.
Keywords: triflic acid; formal cross; cross dehydrogenative; coupling triarylmethanes ... See more keywords
The Use of Polydialkylsiloxanes/Triflic Acid as Derivatization Agents in the Analysis of Sulfur-Containing Aromatics by “Soft”-Ionization Mass Spectrometry
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DOI: 10.3390/molecules27238600
Abstract: Polycyclic aromatic sulfur-containing compounds are widely distributed in oil, especially in its low-volatile and heavy fractions (resins, asphaltenes), and this dictates the need for their determination when reliable methods for sulfur removing, cleaning and processing… read more here.
Keywords: ionization; mass spectrometry; sulfur; sulfur containing ... See more keywords