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.
铑催化的直接交叉偶联反应可将各种(杂)芳烃与醌进行偶联。该方案适用于广泛的底物和多种取向基团。
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.
Ionic liquid catalyzed Ritter reaction/Pd-catalyzed directed Ortho-arylation; facile access to diverse libraries of biaryl-amides from Aryl-nitriles
作者:Suraj M. Sutar、Hemantkumar M. Savanur、Rajesh G. Kalkhambkar、Gabriela L. Borosky、Gopalakrishnan Aridoss、Kenneth K. Laali
DOI:10.1016/j.tetlet.2020.152553
日期:2020.12
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.