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Citation: ZHAO Li-jiao, ZHONG Ru-gang, SHE Yuan-bin, DAI Qian-huan. Ab initio Study on the Reactivity of Non-α-metabolites of Alkylnitrosamines[J]. Acta Physico-Chimica Sinica, ;2005, 21(08): 883-887. doi: 10.3866/PKU.WHXB20050812 shu

Ab initio Study on the Reactivity of Non-α-metabolites of Alkylnitrosamines

1.
College of Life Science and Bioengineering, Beijing University of Technology, Beijing 100022

Received Date: 24 December 2004
Available Online: 15 August 2005

The non-α-position metabolites of nitrosamines play an important role in chemical carcinogenesis. Ab initio computations are carried out to study the reactivity of β- and γ-position metabolites of methylakylnitrosamines. Taking N-methyl-N-nitroso-2-(sulfate)ethylamine(Ⅰ), N-methyl-N-nitroso-2- (phosphate)ethylamine(Ⅱ), N-methyl- N-nitroso-2-(glucuronate)ethylamine(Ⅲ), N-methyl-N-nitroso-3- (sulfate)-propylamine (Ⅳ), N-methyl- N-nitroso-3- (phosphate)propylamine (Ⅴ), and N-methyl-N-nitroso-3- (glucuronate)propylamine (Ⅵ) as models, we investigate their reactivity with the anchimeric assistant process of the N-nitroso groups. Full geometric structure optimization has been done for all reactants, intermediates and transition states. The activation energies, vibrational frequencies and IRC are also obtained. All computations are performed at RHF/6-31G(d) and MP2/6-31G(d) levels. The results show that the reactivity of the sulfates (Ⅰand Ⅳ) are obviously higher than those of the phosphates (Ⅱ and Ⅴ) and the glucuronates (Ⅲ and Ⅵ). And these data indicate that the anchimeric assistance is much more efficient when the leaving group is on the β-carbon than on the γ-carbon.
- Alkylnitrosamines;Non-α-metabolites;Anchimeric assistance; Reactivity;Ab initio
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