Preparation of New Nitrogen-Bridged Heterocycles. 59. Syntheses and Intramolecular Interactions of 3-(Acylmethylthio)- and 3-[(3-Ethoxycarbonyl-2-propenyl)thio]thieno[3,4-<i>b</i>]indolizine Derivatives
作者:Akikazu Kakehi、Hiroyuki Suga、Hirohide Isogai
DOI:10.1248/cpb.55.95
日期:——
Various thieno[3,4-b]indolizine derivatives having an acylmethylthio or (3-ethoxycarbonyl-2-propenyl)thio group at the 3-position which could not be obtained by a conventional method were prepared by a new procedure using cyanoethyl group as a protecting group and their intramolecular arene-pi interactions were investigated. In the (1)H-NMR spectra of these thieno[3,4-b]indolizines, the low-field shifts
使用氰基乙基作为新方法,通过常规方法制备了在3-位具有酰基甲硫基或(3-乙氧基羰基-2-丙烯基)硫基的噻吩并[3,4-b]吲哚嗪衍生物。研究了保护基及其分子内芳烃-π相互作用。在这些噻吩并[3,4-b]吲哚嗪酮的(1)H-NMR光谱中,与3-(甲硫基)相比,观察到了5个质子的低场位移(δ0.10-0.33 ppm)。噻吩并[3,4-b]吲哚嗪为标准。紫外光谱还显示出由于芳烃-π相互作用而在425-445nm处的特征吸收带,但是它们的强度通常低于3-(芳基甲硫基)噻吩并[3,4-b]吲哚并嗪的强度。在他们的X射线分析中,对3-(酰基甲硫基)噻吩并[3,