Open AccessStructure-reactivity correlation for the kinetics of the reaction of substituted 4-phenyl-1,4-dihydropyridines formation
Author(s) -
Jovica V. Urošević,
Saša Ž. Drmanić,
Jasmina B. Nikolić,
Ivan O. Juranić,
Bratislav Ž. Jovanović
Publication year - 2013
Publication title -
journal of the serbian chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.227
H-Index - 45
eISSN - 1820-7421
pISSN - 0352-5139
DOI - 10.2298/jsc131120139u
Subject(s) - chemistry , reactivity (psychology) , kinetics , enamine , substituent , hammett equation , reaction rate constant , molecule , computational chemistry , chemical kinetics , medicinal chemistry , organic chemistry , catalysis , medicine , physics , alternative medicine , pathology , quantum mechanics
Quantitative structure-reactivity correlations for the kinetics of the Hantzsch's synthesis of substituted 4-phenyl-1,4-dihydropyridines in the reaction between ethyl m- and p-substituted benzylidene acetoacetate and enamine has been studied. The reaction kinetics was followed using spectrophotometric measurements. It was found that the reaction correspond to the second-order kinetics. Quantitative structure-reactivity correlations of log k with the corresponding substituent constants (s,s+,sI and sR+) using Hammett and extended Hammett equation (DSP equation). They show linear relationship with positive values of reaction constants (r). The obtained data were processed by the linear regression analysis. It is confirmed that Michael's addition of enamine to benzylidene represents the slow step of the reaction with high positive charge at the benzylidene molecule. MO calculations were performed and they were also in agreement with the conclusions derived from structure-reactivity correlations. [Projekat Ministarstva nauke Republike Srbije, br. 172013