58754-30-6Relevant academic research and scientific papers
Cobalt(II)-catalyzed regio- And stereoselective hydroarylation of alkynes with organoboronic acids
Lin, Pao-Shun,Jeganmohan, Masilamani,Cheng, Chien-Hong
supporting information; experimental part, p. 11296 - 11299 (2009/12/05)
The series of cobalt (II)-catalyzed cross-coupling reactions of organoboronic acids with alkynes was investigated. The reaction provided a convenient method for the synthesis of highly substituted olefins by using less expensive cobalt complexes as catalysts under base-free conditioned. The scope of organoboronic acids 1 and alkynes 2 in the addition reaction under the standard reaction conditions was also analyzed. Based on the known metal-catalyzed couplings of organometallic reagents and alkynes, a possible reaction mechanism for the present hydroarylation reaction was proposed. These are the first cobalt-catalyzed addition reactions of organoboronic acids to alkynes. The unusual trans stereochemistry for the hydroarylation of substituted propargyl alcohol and amine was observed. The results showed that the organoboronic acid plays a dual role, acting both as a carbon nucleophile as well as proton source in the reaction.
Substituted piperidines
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, (2008/06/13)
The compounds are of the heterocyclic class of 2-phenethylpiperidines having an amido substituent in the ortho position of the phenethyl moiety. Substituents in the ortho position include formamido, benzamido, cinnamamido, 2-thiophenecarboxamido, alkanesulfonamido and alkanoylamido. They are useful as antiarrhythmic and/or antiserotonin agents. The novel compounds are prepared by reaction of appropriately substituted o-aminophenethylpiperidines and the carbonyl or sulfonyl halides or anhydrides. Typical embodiments of this invention are 4-methoxy-2'-[2-(1-methyl-2-piperidyl)ethyl]benzanilide and 2'-[2-(1-methyl-2-piperidyl)ethyl]cinnamanilide.
