Synthesis of N-(Adamantan-1-yl)carbamides by Ritter Reaction from Adamantan-1-ol and Nitriles in the Presence of Cu-Catalysts
作者:A. R. Bayguzina、A. R. Lutfullina、R. I. Khusnutdinov
DOI:10.1134/s1070428018080031
日期:2018.8
A selective synthesis of (Z)-N-(adamantan-1-yl)carbamides by the reaction of adamantan-1-ol and nitriles in the presence of Cu catalysts was carried out. Z-Conformation of amides is established basing on X-ray diffraction analysis and 2D NMR data.
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.
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