Crystal structures and properties of mutagenic N-acyloxy-N-alkoxyamides — “most pyramidal” acyclic amides
作者:Ashley-Mae E. Gillson、Stephen A. Glover、David J. Tucker、Peter Turner
DOI:10.1039/b306098p
日期:——
degrees and [chiN] of 66 degrees and 65 degrees. The sp3 nature of nitrogen results in negligible amide resonance as evidenced by long N-C(O) bonds, high IR carbonyl stretch frequencies, carbonyl 13C NMR data and very low amide isomerisation barriers. In addition, conformations in the solid state support a strong n(O)-sigma*(NOAc), anomeric interaction as predicted by molecular orbital theory. HF/6-31G*
两种N-酰氧基-N-烷氧基酰胺(一类直接作用的诱变剂)的X射线数据表明,在酰胺氮上具有极端的金字塔形结构,与在氮原子上被双氧取代的酰胺的光谱学和理论上确定的性质保持一致。两种氧的组合电负性导致氮的平均角度为107.8和108.1度,[chiN]为66度和65度。氮的sp3性质导致酰胺共振可忽略不计,如长NC(O)键,高IR羰基拉伸频率,羰基13C NMR数据和非常低的酰胺异构化障碍所证明。此外,固态构象支持分子轨道理论所预测的强n(O)-sigma *(NOAc)异头相互作用。HF / 6-31G *的甲酰胺计算,