- Molybdenum-silver co-catalyzed cycloaddition of alkynes with: N -isocyanoiminotriphenylphosphorane (NIITP): An efficient strategy for the synthesis of monosubstituted pyrazoles
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A new molybdenum-silver co-catalyzed [3+2] cycloaddition of alkynes with N-isocyanoiminotriphenylphosphorane (NIITP) has been described. The NIITP serves as a non-toxic, facile "CNN" source. Over 30 substrates were successfully converted to the desired compounds in good to excellent yields.
- Mi, Pengbing,Lang, Jiajia,Lin, Shaojian
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supporting information
p. 7986 - 7989
(2019/07/10)
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- An efficient solvent-free synthesis of NH-pyrazoles from β-dimethylaminovinylketones and hydrazine on grinding
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A series of NH-pyrazoles was efficiently synthesized from the reaction of β-dimethylaminovinylketones ([R1C(O)C(R2){double bond, long}CHN(Me2)], where R1 = Me, Ph, 3-MeO-Ph, 4-Me-Ph, 4-MeO-Ph, 4-F-Ph, 4-Cl-Ph, 4
- Longhi, Kelvis,Moreira, Dayse N.,Marzari, Mara R.B.,Floss, Vagner M.,Bonacorso, Helio G.,Zanatta, Nilo,Martins, Marcos A.P.
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supporting information; experimental part
p. 3193 - 3196
(2010/08/05)
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- Novel C-Alkylation Reaction of Condensed Thiophenes with Enaminones, Enaminonitriles, Ethoxymethylenemalonitrile, Aryl Vinyl Ketones and ω-Nitrostyrenes
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The reaction of 1 with enaminones (3a-c) affords either the enaminones 4a-c or a mixture of 4a-c and the α,β-unsaturated ketones 9a-c depending on applied reaction conditions. Compounds 4a-c rearranged into 9a-c on long reflux in dioxane solution in prese
- Al-Etabi, Alya,Al-Awadi, Nouria,Al-Omran, Fatima,Abdel-Khalik, Mervat Mohammed,Elnagdi, Mohamed Hilmy
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p. 151 - 163
(2007/10/03)
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- A general, [1+4] approach to the synthesis of 3(5)-substituted pyrazoles from aldehydes
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A new, one-pot preparation of 3(5)-substituted-1H-pyrazole is described that employs Horner-Emmons reaction of aldehydes with dianion of novel phosphonate 1 and proceeds through cyclization of N-sodium salt of α,β- unsaturated tosylhydrazones 2.
- Almirante, Nicoletta,Cerri, Alberto,Fedrizzi, Giorgio,Marazzi, Giuseppe,Santagostino, Marco
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p. 3287 - 3290
(2007/10/03)
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