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Computational study of pharmacophores: beta-lactams

机译:药效团的计算研究:β-内酰胺类

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摘要

The thermochemistry of bicyclic lactams (penams, penems, cephams, cephems), which are key pharmacophores in beta-lactam antibiotics, has been investigated by high-level ab initio methods. Particular attention has been paid to estimating magnitudes of amide resonance (ARE) and ring strain (RSE) in the four-member lactam ring because these quantities are difficult to measure and distinguish experimentally. The ring strain destabilization effect is greater than the stabilization arising from amide resonance. However, in cephemes the amide resonance stabilization slightly exceeds destabilization due to the beta-lactam ring strain.
机译:已经通过高水平的从头算方法研究了作为β-内酰胺抗生素中关键药效基团的双环内酰胺(penams,penem,cephams,cephems)的热化学。由于四量内酰胺环中的酰胺共振(ARE)和环应变(RSE)的大小难以通过实验进行测量和区分,因此已特别注意对其进行估算。环应变的去稳定作用大于酰胺共振引起的稳定作用。但是,在乙炔中,由于β-内酰胺环的应变,酰胺的共振稳定作用略高于去稳定作用。

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