Ab initio calculations on neutral and alkaline hydrolyses of beta-lactam antibiotics. A theoretical study including solvent effects

被引:59
作者
Pitarch, J
RuizLopez, MF
PascualAhuir, JL
Silla, E
Tunon, I
机构
[1] UNIV NANCY 1, CHIM THEOR LAB, URA CNRS 510, F-54506 VANDOEUVRE LES NANCY, FRANCE
[2] UNIV VALENCIA, DEPT QUIM FIS, E-46100 BURJASSOT, VALENCIA, SPAIN
关键词
D O I
10.1021/jp963387u
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
In this work we present a theoretical study of neutral and alkaline hydrolyses of N-methylazetidinone as a model of biological hydrolysis of beta-lactam antibiotics. Calculations have been carried out at the HF and MP2 levels using the 3-21G, 6-31G*, and 6-31+G* basis sets. Solvent effects have been included by means of a polarizable continuum model. Our results indicate two possible reaction mechanisms for the beta-lactam hydrolysis: concerted and stepwise. In both the neutral and alkaline hydrolyses the concerted mechanism presents a free energy barrier lower than that of the stepwise mechanism.
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收藏
页码:3581 / 3588
页数:8
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