Reusable Nickel Nanoparticles‐Catalyzed Reductive Amination for Selective Synthesis of Primary Amines
作者:Kathiravan Murugesan、Matthias Beller、Rajenahally V. Jagadeesh
DOI:10.1002/anie.201812100
日期:2019.4
The preparation of nickel nanoparticles as efficient reductive amination catalysts by pyrolysis of in situ generated Ni‐tartaric acid complex on silica is presented. The resulting stable and reusable Ni‐nanocatalyst enables the synthesis of functionalized and structurally diverse primary benzylic, heterocyclic and aliphatic amines starting from inexpensive and readily available carbonyl compounds and
Synthesis and cycloxygenase inhibitory properties of new naphthalene-methylsulfonamido, naphthalene-methylsulfonyl and tetrahydronaphthalen-methylsulfonamido compounds
We synthesized a series of new naphthalene derivatives: naproxen- and 6-methoxy naphthalene acetic acid-like 1-5. In these compounds the carboxylic function, typical of the classical NSAIDs, was replaced by a methylsulfonamido (1, 2 and 6a-c) or methylsulfonyl (3-5) group present in some selective COX-2 inhibitors. We also synthesized compounds 7 and 8 in which the naphthalene portion was substituted by tetrahydronaphthalene ring. Some of the new compounds were assayed for their enzymatic inhibitory activity towards cycloxygenase enzymes. Compounds 4 and 6b, at a concentration of 10 mu M exhibit percentage inhibition values of 65%, 50% and 29%, 87% towards COX-2 and COX-1, respectively. The substitution of carboxylic group with a mehylsulfonamido or a methylsulfonyl groups does not allow to direct the selectivity versus to cycloxygenase enzymes.