Trifluoromethylation of alkenes with concomitant introduction of additional functional groups

Regioselective oxidative trifluoromethylation of imidazoheterocycles via C(sp2)-H bond functionalization

Catalytic oxidative trifluoromethylation of imidazopyridines has been carried out at room temperature through the functionalization of the sp(2) C-H bond employing Langlois reagent under ambient air. A library of 3-(trifluoromethyl)imidazo[1,2-a]pyridines with broad functionalities have been synthesized regioselectively. This methodology is also applicable to imidazo[2,1-b]thiazole and benzo[d]imidazo[2,1-b]thiazole.

Electrophilic trifluoromethylthiolation of thiols with trifluoromethanesulfenamide

Efficient and highly selective, metal-free, acid promoted synthesis of trifluoromethyl disulfides from thiols and PhNHSCF₃ is described.

First efficient synthesis of SF5-substituted pyrrolidines using 1,3-dipolar cycloaddition of azomethine ylides with pentafluorosulfanyl-substituted acrylic esters and amides

Di-, tri- and tetrasubstituted pentafluorosulfanylated pyrrolidines have been efficiently synthetized via 1,3-dipolar cycloaddition of azomethine ylides.

Light triggered addition/annulation of 2-isocyanobiphenyls toward 6-trifluoromethyl-phenanthridines under photocatalyst-free conditions

A photocatalyst-free, light promoted sequential radical addition/annulation of 2-isocyanobiphenyls to 6-trifluoromethyl phenanthridines with high efficiency is presented.

Visible light-mediated arylalkylation of allylic alcohols through concomitant 1,2-aryl migration

A photocatalytic process for selective arylalkylation of allylic alcohols via unique 1,2-aryl migration with α-bromo diethyl malonate has been developed.

Copper-catalyzed trifluoromethylation of alkenes: synthesis of trifluoromethylated benzoxazines

A ligand and base free copper catalyzed method has been developed for the construction of trifluoromethylated benzoxazines by using Umemoto's reagent.

Benzylic C–H trifluoromethylation of phenol derivatives

Phenol derivatives were trifluoromethylated using copper/Togni reagent. Reaction in DMF selectively gave benzylic trifluoromethylation products, whereas aromatic trifluoromethylation products were obtained in t-BuOH.

Regioselective access to CF3S-substituted dihydrofurans from homopropargylic alcohols with trifluoromethanesulfenamide

A facile access to 4-((trifluoromethyl)thio)-2,3-dihydrofurans from unprotected homopropargylic alcohols in high regioselectivity is reported.

Acid-promoted direct electrophilic trifluoromethylthiolation of phenols

A highly selective and effective, acid-promoted, electrophilic trifluoromethylthiolation of phenols is described.

Copper(i)-photocatalyzed trifluoromethylation of alkenes

Using the photoreducible Cu^II precatalyst 2, trifluoromethylation of terminal alkenes can be conducted at low copper loading on exposing the reaction mixture to sunlight/ambient light.

Copper-catalysed ring-opening trifluoromethylation of cyclopropanols

A copper catalyzed ring-opening trifluoromethylation of cyclopropanols under mild reaction conditions was developed. A wide variety of synthetically useful β-trifluoromethyl ketones were obtained.

CF3-Substituted semisquarate: a pluripotent building block for the divergent synthesis of trifluoromethylated functional molecules

The first synthesis of a CF₃-substituted semisquarate was accomplished via nucleophilic trifluoromethylation using CF₃SiMe₃ and subsequent rhenium-catalyzed allylic alcohol rearrangement.

Copper-catalyzed difunctionalization of activated alkynes by radical oxidation-tandem cyclization/dearomatization to synthesize 3-trifluoromethyl spiro[4.5]trienones

A copper-catalyzed difunctionalizing trifluoromethylation of activated alkynes with the cheap reagent sodium trifluoromethanesulfinate (NaSO2CF3 or Langlois' reagent) has been developed incorporating a tandem cyclization/dearomatization process. This strategy affords a straightforward route to synthesis of 3-(trifluoromethyl)-spiro[4.5]trienones, and presents an example of difunctionalization of alkynes for simultaneous formation of two carbon-carbon single bonds and one carbon-oxygen double bond.

Mild silver-mediated geminal difluorination of styrenes using an air- and moisture-stable fluoroiodane reagent

An air- and moisture-stable fluoroiodane in the presence of AgBF4 is suitable for selective geminal difluorination of styrenes under mild reaction conditions. One of the CF bonds is formed by transfer of electrophilic fluorine from the hypervalent iodine reagent, while the other one arises from the tetrafluoroborate counterion of silver. Deuterium-isotope-labelling experiments and rearrangement of methyl styrene substrates suggest that the reaction proceeds through a phenonium ion intermediate.

Recent progress in direct introduction of fluorinated groups on alkenes and alkynes by means of C-H bond functionalization

The direct introduction of fluorine and fluorinated building blocks has recently attracted a lot of attention and particularly the direct functionalization of alkenes and alkynes. This review will highlight the major progress recently made in that field, with a focus on photocatalyzed transformations, base-promoted processes, and transition metal-catalyzed functionalization of alkenes and alkynes. Special attention will be paid to explanations of the reaction mechanisms.

Copper-catalyzed β-trifluoromethylation of conjugated hydrazones

The Cu-catalyzed direct β-trifluoromethylation of α,β-unsaturated aldehyde N,N-dibenzylhydrazones with Togni hypervalent iodine reagent is described. The reaction yields stereodefined CF3-alkenyl derivatives under mild conditions and is proposed to proceed via a radical process.

One pot and selective intermolecular aryl- and heteroaryl-trifluoromethylation of alkenes by photoredox catalysis

A general and efficient photoredox-catalyzed intermolecular aryl- and heteroaryltrifluoromethylation of styrenes with Umemoto's reagent has been developed.

Oxidative nucleophilic strategy for synthesis of thiocyanates and trifluoromethyl sulfides from thiols

In the presence of a 2 × 2 manganese oxide-based octahedral molecular sieve (OMS-2) and potassium fluoride (KF), various thiocyanates and trifluoromethyl sulfides could be synthesized from thiols in almost quantitative yields.