Intermolecular interactions that determine the regioselectivity in 1,3-dipolar cycloadditions ofN-methyl-1,3-oxazolium-5-olates withN-(phenylmethylene)benzenesulphonamide
作者:L. Bonati、R. Ferraccioli、G. Moro
DOI:10.1002/poc.610080703
日期:1995.7
1,3-Dipolar cycloadditions of N-(phenylmethylene)benzenesulphonamide with mesionic N-methyl-1,3-oxazolium-5-olates give 2,5-disubstituted imidazole derivatives with high regioselectivity. The intermolecular interactions underlying this regioselectivity were investigated. The conformational and electronic properties of the reagents were characterized separately. The approach in the early stages of the
N-(苯基亚甲基)苯磺酰胺的1,3-偶极环加成与N-甲基-1,3-恶唑鎓5-油酸酯的中性离子生成具有高区域选择性的2,5-二取代的咪唑衍生物。研究了这种区域选择性的分子间相互作用。分别对试剂的构象和电子性质进行了表征。然后通过考虑空间和静电分子相互作用对反应早期阶段的方法进行建模。通过扰动分子轨道(PMO)处理计算出了与不同反应路径有关的相互作用能,并进行了比较。