25856-06-8

Upstream product

• 100-52-7 benzaldehyde 
• 99-91-2 para-chloroacetophenone 
• 22966-22-9 (E)-1-(4-chlorophenyl)-3-phenyl-2-propen-1-one 
• 956-02-5 4'-chlorochalcone 

Downstream Products

• 17059-59-5 1-(4-chloro-phenyl)-3-phenyl-propane-1,3-dione 
• 87275-56-7 5-(Bromo-phenyl-methyl)-4-(4-chloro-phenyl)-1-phenyl-1,5-dihydro-imidazol-2-one 
• 22966-22-9 (E)-1-(4-chlorophenyl)-3-phenyl-2-propen-1-one 
• 74989-92-7 (4R,5R)-4-Bromo-3-(4-chloro-phenyl)-1-(2,4-dinitro-phenyl)-5-phenyl-4,5-dihydro-1H-pyrazole 
• 87275-51-2 5-(Bromo-phenyl-methyl)-4-(4-chloro-phenyl)-1,5-dihydro-imidazol-2-one 
• 87275-45-4 5-Bromo-4-(4-chloro-phenyl)-6-phenyl-5,6-dihydro-1H-pyrimidin-2-one 
• 956-02-5 4'-chlorochalcone 
• 50603-94-6 2-bromo-3-phenyl-1-(4-chlorophenyl)-2-propen-1-one 
• 54458-29-6 2-bromo-1-(4-chlorophenyl)-3-phenyl-1,3-propanedione 
• 74990-07-1 3-(4-Chloro-phenyl)-1,5-diphenyl-1,5-dihydro-pyrazol-4-one 
• 74990-18-4 3-(4-Chloro-phenyl)-1,5-diphenyl-1,5-dihydro-pyrazole-4-thione 
• 75008-93-4 3-(4-Chloro-phenyl)-1-(2,4-dinitro-phenyl)-5-phenyl-1,5-dihydro-pyrazol-4-one 
• 74990-14-0 3-(4-Chloro-phenyl)-1-(2,4-dinitro-phenyl)-5-phenyl-1,5-dihydro-pyrazole-4-thione 
• 100272-18-2 (4-chlorophenyl)(4,5-diphenyl-1H-pyrazol-3-yl)methanone 

Relevant academic research and scientific papers

Modular access to 1,2-allenyl ketones based on a photoredox-catalysed radical-polar crossover process

Herein, a new protocol dealing with the preparation of 1,2-allenyl ketones has been successfully developedviathe reactions of enynes with radicals enabled by dual photoredox/copper catalysis. Based on the results of a deuteration experiment and the competition reaction between cyclopropanation and allenation, the mechanism based on a photoredox-neutral-catalysed radical-polar crossover process has been proposed. Synthetic applications of allenes have also been demonstrated.

A new synthetic strategy towards 2,4,5-trisubstituted 1H-imidazoles and highly substituted pyrrolo[1,2-c]imidazoles by use of α-azidochalcones via Michael addition-cyclization followed by Wittig reaction

Efficient and facile protocols for the preparation of highly functionalized 1H-imidazoles and 5H-pyrrolo[1,2-c]imidazoles are described. Heating a mixture of an α-azidochalcones and N,N,N′,N′-tetramethyl guanidine under neat conditions gave the corresponding 2,4,5-trisubstituted 1H-imidazole via Michael addition-cyclization in excellent yields. Subsequently, the prepared 1H-imidazoles undergo addition-Wittig reaction with acetylenic esters in presence of triphenylphosphine in dichloromethane to afford 5H-pyrrolo[1,2-c]imidazoles in high yields.

Visible-light photoredox catalysis enabled bromination of phenols and alkenes

A mild and efficient methodology for the bromination of phenols and alkenes has been developed utilizing visible light-induced photoredox catalysis. The bromine was generated in situ from the oxidation of Br- by Ru(bpy)33+, both of which resulted from the oxidative quenching process.

One-pot three-component approach to the synthesis of polyfunctional pyrazoles

A simple, multicomponent, and straightforward reaction of vinyl azide, aldehyde, and tosylhydrazine affords the construction of 3,4,5-trisubstituted 1H-pyrazoles regioselectively in the presence of base with moderate to excellent yields. A range of functionality could be tolerated in this methodology, and a possible mechanism is proposed.

Chemoselective C-C bond cleavage of epoxide motifs: Gold(I)-catalyzed diastereoselective [4+3] cycloadditions of 1-(1-Alkynyl)oxiranyl ketones and nitrones

Cutting carbon! A novel facile strategy for the C-C bond cleavage of oxiranyl ketones has been developed. Carbophilic gold(I) activation of the alkyne side chain mediates a heterocyclization and subsequent C-C bond cleavage (see scheme).

Solvolytic stereoselective debromination of vic-dibromides with HMPA

A simple and efficient procedure for the debromination of vic-dibromides has been reported with hexamethylphosphoric triamide at 155-160°C under a nitrogen atmosphere without the aid of any reagent.

New Derivatives of N-Vinyltriazoles: 1,3-Diaryl-3-(1H-1,2,4-triazol-1-yl)-2-propen-1-ones

We have synthesized previously unknown N-vinyltriazoles: 1,3-diaryl-3-(1H-1,2,4-triazol-1-yl)-2-propen-1-ones.We discusss a hypothesis for a probable reaction mechanism.

Imidazo[2,1-b]thiazole derivatives XII. Synthesis and immunoactivity in vitro on human T lymphocyte of several 3-aroylmethyl and 2-aroyl-3-methyl(aryl)-5,6-dihydroimidazo[2,1-b]thiazoles

To estimate the influence of aryl group position on the immunostimulant properties of imidazo[2,1-b]thiazole derivatives, several compounds were obtained and tested, versus tetramisole hydrochloride, on the mobilisation of CD2 receptor by human T lymphocyte. The synthesis use the action of monobrominated β-diketones on the 2-mercaptoimidazoline. So, 1-aryl-4-bromobutane-1,3-diones lead to 3-aroylmethyl-5,6-dihydroimidazo[2,1-b]thiazoles 4. Same, 1-aryl-2-bromobutane-1,3-diones and 1,3-diaryl-2-bromopentane-1,3-diones give respectively 3-aroyl-2-methyl-5,6-dihydroimidazo[2,1-b]thiazoles 5 and 3-aroyl-2-aryl-5,6-dihydroimidazo[2,1-b]thiazoles 6. Better yields are obtained when the reaction presents two steps. The first one, realized in acetone at room temperature, leads to an intermediate S-substituted 4,5-dihydroimidazole which, in second step, is cyclized in imidazo[2,1-b]thiazole compound via an unisolated carbinolamine. This one explains the univocal formation of 5 derivatives and the feasible blending in case of 6. The immunoactivity of several imidazothiazoles 4, 5 and 6 is lower that them of 6-aryl substituted compounds and particularly that the levamisole which is the reference product in this series.