Trifluoromethyl group in the synthesis of heterocyclic compounds: New and efficient synthesis of 3-aryl-4-aminocinnolines
摘要:
A novel base induced transformation of hydrazones 3a-f derived from trifluoromethylaryl ketones and arylhydrazines was found to produce 3-aryl-4-aminocinnolines 4a-g in 52-75% yield. The initial step of the reaction is believed to involve abstraction of Hf from hydrazone.
Synthesis of Chiral Trifluoromethyl-Substituted Hydrazines via Pd-Catalyzed Asymmetric Hydrogenation and Reductive Amination
作者:Zhang-Pei Chen、Shu-Bo Hu、Ji Zhou、Yong-Gui Zhou
DOI:10.1021/acscatal.5b01641
日期:2015.10.2
An efficient approach toward the synthesis of cyclic and linear chiraltrifluoromethyl substituted hydrazines was developed by Pd-catalyzed asymmetric hydrogenation of both N-acyl and N-aryl hydrazones in excellent yields and up to 97% ee. A successful reductive amination between trifluoromethyl substituted ketones and hydrazines was also achieved.
Anion-Driven C–F Bond Activation of Trifluoromethyl <i>N</i>-Aryl Hydrazones: Application to the Synthesis of 1,3,4-Oxadiazoles
作者:Qijie Zou、Wei Zhang、Haoyue Wang、Guangwei Yin、Yongzhi He、Fangyi Li
DOI:10.1021/acs.joc.3c01822
日期:2023.11.3
The CF3 group attached to N-aryl hydrazone could be activated upon treatment with a suitable base, thus serving as an excellent C1 unit for the assembly of a series of 1,3,4-oxadiazoles by reaction with hydrazides. The transformation is proposed to proceed via the intermediate formation of a gem-difluorinated azoalkene. Furthermore, this reaction features simple conditions and a broad substrate scope
An efficient transition-metal-free synthesis of 1H-indazoles from arylhydrazones with montmorillonite K-10 under O2 atmosphere
作者:Jin Yu、Jin Woo Lim、Su Yeon Kim、Jimin Kim、Jae Nyoung Kim
DOI:10.1016/j.tetlet.2015.01.183
日期:2015.3
An efficient transition-metal-free synthetic method of 1H-indazoles has been developed. The reaction of arylhydrazones in the presence of montmorillonite K-10 in 1,2-dichlorobenzene at 130 degrees C afforded 1Hindazoles in good yields most likely via a sequential intramolecular nucleophilic cyclization and an aerobic oxidation pathway. (C) 2015 Elsevier Ltd. All rights reserved.