19730-13-3Relevant academic research and scientific papers
Picolyl alkyl amines as novel tyrosinase inhibitors: Influence of hydrophobicity and substitution
Bandyopadhyay, Punam,Jha, Sujeetkumar,Imran Ali
experimental part, p. 9780 - 9786 (2010/08/22)
Several novel picolyl alkyl amine derivatives (A-L) were synthesized, and the influence of hydrophobicity and substitution on the inhibition of mushroom tyrosinase toward both monophenolase and dlphenolase activities are described, α-, β-, and γ-picolyl amines are neither the substrates nor the inhibitors; however, the inhibition Is induced by the incorporation of an alkyl chain. The inhibition was strongly dependent on the substitution on a pyridine ring, and the inhibition follows the trend of a-picolyl alkyl amines (A, D, G) β-picolyl alkyl amines (B, E, H) γ -picolyl alkyl amines (C, F, I). The inhibition kinetics have been investigated, and γ-substituted derivatives were found to be a mixed type of inhibitor, whereas β-substituted derivatives were found to exhibit uncompetitive inhibition toward the oxidation of L-DOPA.
Pyrrolidine-modified and 6-substituted analogs of nicotine: a structure-affinity investigation
Dukat, M.,Fiedler, W.,Dumas, D.,Damaj, I.,Martin, B. R.,et al.
, p. 875 - 888 (2007/10/03)
Because the structural requirements for the binding of nicotine to central nicotine receptors remain largely uninvestigated, we undertook a systematic investigation of pyrrolidine ring-opened analogs.This led to a subsequent investigation of related conformationally restricted derivatives of these analogs.The results are reported relative to the binding of several well-known and widely used nicotine receptor ligands.Although none of the ring-opened analogs binds with higher affinity than (-)-nicotine (Ki = 2.3 nM), 3-(N-methyl-N-ethylaminomethyl)pyridine (12a; Ki = 28 nM) binds with significant affinity.A conformationally restricted analog of 12a, N-methyl naphthyridine 30b (Ki = 18 nM), binds with similar affinity. 6-Substitution of 12a and racemic nicotine seems to be tolerated when the substituent is halogen or methyl.In functional studies (hypolocomotion and antinociception in mice; stimulus generalization in nicotine-trained rats) 30b retains nicotine-like properties.Several of the 6-substituted compounds were 2 to 20 times more potent than (+/-)nicotine.Although the intact pyrrolidine ring of nicotine appears important for optimal affinity, its presence is not an absolute requirement for activity, and 6-position substitution of the pyridine nucleus can influence both binding and functional activity. - Keywords: nicotine; nicotine receptor; drug discrimination; antinociception.
