نتایج جستجو برای: 5 tri substituted pyrazoles
تعداد نتایج: 1260756 فیلتر نتایج به سال:
A new disconnection toward tri- and tetrasubstituted furans has been conceptualized and demonstrated. A mild, base-mediated reaction of an allenoate pronucleophile with α-halo ketones/dicarbonyl compounds results in a Csp2-alkylation/enolization/O-vinylation sequence to ultimately afford substituted furan derivatives. The reaction offers a broad scope, provides a facile access to alkyl and aryl...
A series of heteroleptic Ir(III) metal complexes 1-3 bearing two N-phenyl-substituted pyrazoles and one 2-pyridyl pyrazole (or triazole) ligands were synthesized and characterized to attain highly efficient, room-temperature blue phosphorescence. The N-phenylpyrazole ligands, dfpzH = 1-(2,4-difluorophenyl)pyrazole, fpzH = 1-(4-fluorophenyl)pyrazole, dfmpzH = 1-(2,4-difluorophenyl)-3,5-dimethylp...
Abstract The cobalt‐catalyzed reaction between 1,3‐dithiolanes and Grignard reagents, for the efficient synthesis of multi‐substituted alkene products, is described. method was applicable to a variety benzylic dithiolane substrates, affording di‐, tri‐, tetra‐substituted 1,1‐diaryl products in good excellent yields. use reagents with aryl aldehyde‐derived enabled access natural product‐derived ...
SYNTHESIS OF NOVEL SUBSTITUTED PYRAZOLES AND ISOXAZOLES CONTAINING 1, 4-BENZODIOXANE SULFONYL MOIETY
An efficient method for the synthesis of 3,5-disubstituted pyrazoles is described. The reactions of 1,3-dialkynes with hydrazine proceeded smoothly in dimethyl sulfoxide under mild reaction conditions to produce 3,5-disubstituted pyrazoles in satisfactory to excellent yields. A one-pot procedure of the transformation has been developed.
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