A concise method to synthesize 1,2,3,4-tetrahydropyridines is described that involves the use of 2-alkoxy-3,4-dihydropyran as a modular precursor to react with aniline and a nucleophile. In this method, the heteroatom of the dihydropyran ring was replaced by nitrogen of aniline while the nucleophile attached to its adjacent position. Various druglike polyheterocycles were prepared with this method
Combinatorial Synthesis of 3-Arylideneaminoquinazolin-4(1<i>H</i>)-one Derivatives Catalyzed by Iodine in Ionic Liquids
作者:Xiang-Shan Wang、Jie Sheng、Lian Lu、Ke Yang、Yu-Ling Li
DOI:10.1021/co1000713
日期:2011.3.14
A combinatorial synthesis of 3-arylideneaminoquinazolin-4(1H)-one derivatives is described by a reaction of 2-aminobenzohydrazides with two equivalents of aldehydes or ketones in ionicliquidscatalyzed by iodine. Controlling the reaction temperature or reducing the activity of the substrates, respectively, the intermediate products of hydrazones were obtained first, and then they were applied to react
Recyclable gold(I)-catalyzed hydrohydrazidation of terminal alkynes towards keto-N-acylhydrazones
作者:Siqi Liu、Jianying Li、Wenli Hu、Bin Huang、Mingzhong Cai
DOI:10.1016/j.jorganchem.2022.122411
日期:2022.9
heterogeneous gold(I)-catalyzed hydrohydrazidation of terminal alkynes with diverse hydrazides has been developed in chlorobenzene at 60 °C by using an MCM-41-immobilized diphenylphosphine gold(I) complex [Ph2P-MCM-41-AuNTf2] as the catalyst, providing a novel and practical method for the synthesis of a wide variety of substituted keto-N-acylhydrazones in good to excellent yields. This heterogenizedgold(I) catalyst
Gold-Catalyzed Hydrohydrazidation of Terminal Alkynes
作者:Dmitry P. Zimin、Dmitry V. Dar’in、Valentin A. Rassadin、Vadim Yu. Kukushkin
DOI:10.1021/acs.orglett.8b02019
日期:2018.8.17
Facile gold-catalyzed hydrohydrazidation of alkynes with various hydrazides (RCONHNH2)-C-2 (R = Alk or Ar; including those with an additional nudeophilic moiety) in the presence of Ph3PAuNTf2 (6 mol %) leading to a wide range of substituted keto-N-acylhydrazones (18 examples) in excellent to good yields (99-66%) is reported. This novel metal-catalyzed coupling proceeds under mild conditions (chlorobenzene, 60 degrees C), exhibits high functional group tolerance, and is insensitive to the electronic and steric effects of the substituents in the reactants.
Conformational Complexity in Seven-Membered Cyclic Triazepinone/Open Hydrazones. 1. 1D and 2D Variable Temperature NMR Study
作者:Kalevi Pihlaja、Mario F. Simeonov、Ferenc Fülöp
DOI:10.1021/jo962322k
日期:1997.7.1
The stereo chemistry and conformational behavior of a series of 22 2-methyl-2-alkyl(phenyl, aryl)-4-N-methyl-1,2,3,4-tetrahydro-5H-1,3,4-bnezotriazepin-5-ones and their open-chain hydrazone tautomers in various solvents were studied by 1D and 2D NMR techniques in the temperature range from 193 K to 410 K. Molecular rearrangements involving interconversions of the ring and open-chain forms (the latter via amide bond and Z/E C=N double bond isomerization), pseudorotation of the ring forms, and N-inversion processes with different rates on the NMR time scale took place, leading to the observation of average and deceptively simple H-1 and C-13 NMR spectra for most of them at room temperature.