reaction of aromaticamines with triazoles to afford N-aryl-1,2,3-triazoles. Diazonium salts, formed fromaromaticamines and tert-butyl nitrite in the presence of fluoroboric acid, reacted with triazoles in a copper-catalyzed Sandmeyer-type reaction. The reaction proceeded under mild conditions to afford N-aryltriazoles in moderate to good yields. This method is amenable to a wide range of aromatic amines
Phosphino-Triazole Ligands for Palladium-Catalyzed Cross-Coupling
作者:Yiming Zhao、Huy van Nguyen、Louise Male、Philip Craven、Benjamin R. Buckley、John S. Fossey
DOI:10.1021/acs.organomet.8b00539
日期:2018.11.26
Twelve 1,5-disubtituted and fourteen 5-sub-stituted 1,2,3-triazole derivatives bearing diaryl or dialkyl phosphines at the 5-position were synthesized and used as ligands for palladium-catalyzed Suzuki-Miyaura cross-coupling reactions. Bulky substrates were tested, and lead-like product formation was demonstrated. The online tool SambVca2.0 was used to assess steric parameters of ligands and preliminary buried volume determination using XRD-obtained data in a small number of cases proved to be informative. Two modeling approaches were compared for the determination of the buried volume of ligands where XRD data was not available. An approach with imposed steric restrictions was found to be superior in leading to buried volume determinations that closely correlate with observed reaction conversions. The online tool LLAMA was used to determine lead-likeness of potential Suzuki-Miyaura cross-coupling products, from which 10 of the most lead-like were successfully synthesized. Thus, confirming these readily accessible triazole-containing phosphines as highly suitable ligands for reaction screening and optimization in drug discovery campaigns.
[4 + 1] Annulation of in situ generated azoalkenes with amines: A powerful approach to access 1-substituted 1,2,3-triazoles
作者:Hongwei Wang、Yongquan Ning、Paramasivam Sivaguru、Giuseppe Zanoni、Xihe Bi
DOI:10.1016/j.cclet.2021.09.008
日期:2022.3
methods for their preparation mainly rely on thermal [3 + 2] cycloaddition of potentially dangerous acetylene and azides. Here we report a base-mediated [4 + 1] annulation of azoalkenes generated in situ from readily available difluoroacetaldehyde N-tosylhydrazones (DFHZ-Ts) with amines under relatively mild conditions. This azide- and acetylene-free strategy provides facile access to diverse 1-substituted
Synthesis of trifluoromethyl-substituted N-aryl-poly-1,2,3-triazole derivatives
作者:A. Sudheer Kumar、Nagarjuna Kommu、Vikas D. Ghule、Akhila K. Sahoo
DOI:10.1039/c3ta15184k
日期:——
spectroscopic methods; the solid state structures of some of the compounds are confirmed by X-ray diffraction techniques. The synthesized materials decompose in the range of 195–308 °C. Most of the –CF3 and –NO2 groups-bearing aryl triazoles exhibit good densities and acceptable detonation characteristics. Some of the fluorine containing polytriazole-bearing compounds showed positive heats of formation.