Ionic liquid catalyzed Ritter reaction/Pd-catalyzed directed Ortho-arylation; facile access to diverse libraries of biaryl-amides from Aryl-nitriles
摘要:
Diverse libraries of biaryl-amides bearing N-t-butyl and N-adamantyl groups were synthesized in two steps by the Ritter reaction of aryl-nitriles, using tBuOH and AdaOH as carbocation precursors, and employing [BMIM(SO3H)][OTf] (neat or with [BMIM][PF6] as co-solvent) or tetramethyl guanidinium-ILs [TMG][X] (X = CF3COO, EtOSO3) as dual catalyst/solvent, followed by a Pd-catalyzed directed regioselective ortho - C - H arylation of the Ritter amides with Ar-X (X = I, Cl). The feasibility to perform the two-steps in sequence is also demonstrated, and potential for recycling/reuse of the ILs is also shown. Preference for [Pd] coordination to the amide carbonyl versus amide nitrogen is borne out by DFT computations. (C) 2020 Elsevier Ltd. All rights reserved.
1-Amido-3-(1H)-1,2-benziodoxoles: Stable amidoiodanes and reagents for direct amidation of organic substrates
摘要:
Amidobenziodoxoles 2 can be prepared from benziodoxole 1, trimethylsilyltriflate and the appropriate amides in the form of stable, microcrystalline compounds. Amidobenziodoxoles 2 react with adamantane 3 or N,N-dimethylarylamines 5 to afford the corresponding products of amidation, 4 and 6. Copyright (C) 1996 Elsevier Science Ltd
Rh(<scp>iii</scp>)-catalyzed direct C–H/C–H cross-coupling of quinones with arenes assisted by a directing group: identification of carbazole quinones as GSKβ inhibitors
作者:Youngtaek Moon、Yujeong Jeong、Daehyuk Kook、Sungwoo Hong
DOI:10.1039/c4ob02624a
日期:——
Rh-catalyzed direct cross-coupling of various (hetero)arenes with quinones is developed. This protocol is effective for a broad range of substrates and a wide range of directing groups.
CuI nanoparticles as recyclable heterogeneous catalysts for C–N bond formation reactions
作者:Manoranjan Kumar、Vinod Bhatt、Onkar S. Nayal、Sushila Sharma、Vishal Kumar、Maheshwar S. Thakur、Neeraj Kumar、Rajaram Bal、Bikram Singh、Upendra Sharma
DOI:10.1039/c7cy00832e
日期:——
resulting NPs were CuI instead of Cu. The TEM images of CuI exhibited the size of monodispersed spherical NPs in the range of 4 ± 2 nm. These generated NPs can be used as versatile heterogeneous catalysts for important organic transformations. As a proof of concept, CuI NPs were successfully applied as heterogeneous catalysts for the synthesis of secondary amines, amides and triazoles. CuI NPs can be easily
Nafion®-catalyzed microwave-assisted Ritter reaction: an atom-economic solvent-free synthesis of amides
作者:Vivek Polshettiwar、Rajender S. Varma
DOI:10.1016/j.tetlet.2008.02.009
日期:2008.4
An atom-economic solvent-free synthesis of amides by the Ritter reaction of alcohols and nitriles under microwaveirradiation is reported. This green protocol is catalyzed by solid-supported Nafion®NR50 with improved efficiency and reduced waste production.
Synthesis and Biological Evaluation of a Library of Sulfonamide Analogs of Memantine to Target Glioblastoma
作者:John E. Philo、Jenna D. Caudle、Reema N. Moussa、Patrick M. Kampmeyer、Tasfia R. Hasin、David K. Seo、Robert J. Sheaff、Angus A. Lamar
DOI:10.1002/cmdc.202300134
日期:2023.8.15
A library of 34 sulfonamide analogs of memantine has been synthesized. The in vitro activity of the compounds was investigated resulting in 5 strong hits, and a molecular docking study was conducted on the compounds identified as hits. The synthesis and in vitro evaluation of 14 additional analogs has validated the importance of the sulfonamide unit.