The study of the formation mechanism of 1,2,3-trialkyldiaziridines by kinetic and quantum chemistry methods
作者:V. V. Kuznetsov、V. V. Seregin、D. V. Khakimov、T. S. Pivina、M. D. Vedenyapina、A. A. Vedenyapin、N. N. Makhova
DOI:10.1007/s11172-014-0691-7
日期:2014.9
Using UV spectrometry, we studied for the first time the regularities of AlkNHBr consumption in two variations of the formation of 1,2,3-trialkyldiaziridines in aqueous media: by mixing acetaldehyde and AlkNHBr in excess of AlkNH2 (method 1) and by the reaction of MeCH=NEt with EtNHBr in excess of EtNH2 (method 2). We determined the rate constants of the individual stages of the reaction. Using quantum chemistry methods (DFT/B3LYP/3-21G), we performed calculations of spatial and electronic structures of the reacting compounds, indices of local reactivity, and global electrophilicity of atoms of the individual reaction intermediates, based on which we explained the decrease in the reaction rate when using EtNHBr instead of MeNHBr in method 1. In method 2, the formation of 1,2-diethyl-3-methyldiaziridine occurs exclusively through the intermediate iminium cation.
作者:V. V. Kuznetsov、N. N. Makhova、Yu. A. Strelenko、L. I. Khmel'nitskii
DOI:10.1007/bf00959732
日期:1991.12
The greatest yield in the synthesis of diaziridines from carbonyl compounds, amines, and aminating reagents in water is achieved at a specific pH, which shifts to less alkaline values with increasing -I effect of the substituents in the carbonyl compound and with decreasing pK(BH+) value of the amine. The role of pH is related to the conditions for the generation of an immonium from the intermediate alpha-aminocarbinol. The nuclear Overhauser effect was used to determine the orientation of the substituents in several diastereomers of the didikyldiaziridines obtained.
Carboni, B.; Tonnard, F.; Carrie, R., Bulletin de la Societe Chimique de France, 1987, # 3, p. 525 - 530