Structural study of ethyl 3-arylcarbamoyl-2,3-diazabicyclo[2.2.1]hept-5-ene-2-carboxylates: conformation and transmission of substituent effects across the diazabicycloheptene ring
作者:A. Perjéssy、P. Meyer、W.-D. Rudorf、D. Loos、E. Kolehmainen、K. Laihia、M. Nissinen、J. Koivisto、R. Kauppinen
DOI:10.1002/poc.436
日期:2001.11
grown for five compounds and their X-ray data were obtained. The electronic structure and the conformations were calculated by the semi-empirical AM1 method. Using correlations between the spectral, empirical and theoretical structural data, the transmission of substituent effects and the preferential conformation connected with the consecutive double nitrogen inversion and regarding the mutual orientation
通过[4 + 2]环加成反应制备了九种新的3-芳基氨基甲酰基-2,3-二氮杂双环[2.2.1]庚-5-烯-2-羧酸乙酯及其FTIR,1 H,13 C和15 N NMR光谱被测量和分配。使五种化合物的单晶生长,并获得其X射线数据。通过半经验AM1方法计算电子结构和构象。利用光谱,经验和理论结构数据之间的相关性,取代基效应的传递和与连续的两次氮反转相关的优先构象以及关于N H和C的相互取向研究了O键。将结果与先前报道的一系列类似的2-芳基氨基甲酰基-4,5-二甲基-1,2,3,6-四氢哒嗪-1-羧酸乙酯的系列的结果进行比较。版权所有©2001 John Wiley&Sons,Ltd.