Synthesis, semi-empirical and ab initio calculations of tertiary amides formed from cyclic amines and 3-[3-phenyl-1,2,4-oxadiazol-5-yl]propionoyl chloride
作者:Rajendra M Srivastava、Maria da Conceição Pereira、Fernando Hallwass、Sidney Ramos Santana
DOI:10.1016/s0022-2860(01)00658-5
日期:2002.2
The synthesis of four tertiary amides 5a-d formed from 3-(phenyl-1,2,4-oxadiazol-5-yl)propionoyl chloride (3) and cyclic amines 4a-d is described. The structures of these compounds have been inferred from H-1 and C-13 NMR spectroscopy. Semi-empirical (AMI) molecular orbital calculations have been performed for these molecules to learn more about their stable molecular conformations. It was possible to carry out the ab initio (RHF/STO-3G) calculations for two conformers (Pr1 & Pr2) of 5a. Nuclear Overhauser Enhancement Spectroscopy (NOESY) and Exchange Spectroscopy (EXSY) experiments helped us to assign H-7 and to observe the position exchange of the methylene groups attached to amide nitrogen. (C) 2002 Elsevier Science B.V. All rights reserved.