Preparation of New Nitrogen-Bridged Heterocycles 67. Syntheses of .ALPHA.,.ALPHA.'-Bis[(thieno[3,4-b]indolizin-3-yl)thio]-o-, m-, and p-xylene Derivatives and Their Conformational Structures
salts, formed from the S-alkylations of 3-(1-pyridinio)thiophene-2-thiolates with alpha,alpha-dibromo-o-, m-, or p-xylene, provided the corresponding alpha,alpha'-bis[(thieno[3,4-b]indolizin-3-yl)thio]-o-, m-, and p-xylene derivatives in low to good yields. Both (1)H-NMR and UV-Vis spectra of these products supported distinctly the predominance of the gauche-gauche conformation in relation to the two sulfide
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]indolizinederivatives 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
Preparation of New Nitrogen-Bridged Heterocycles. 54. Increased Arene-Arene Interactions of 3-(Bicyclic and Tricyclic Arylmethylthio)thieno [3,4-b] indolizine Derivatives
Some thieno[3,4-b]indolizine derivatives having a 1-naphthylmethylthio, 2-methyl-1-naphthylmethylthio, 2-naphthylmethylthio, or 9-anthrylmethylthio group at the 3-position were prepared and their intramolecular arene-arene interactions were investigated. In comparison with 3-(methylthio)thieno[3,4-b]indolizines which have no such interactions, the (1)H-NMR spectra of title compounds showed large high-field
Preparation of New Nitrogen-Bridged Heterocycles. 58. Syntheses and Intramolecular Arene-.PI. Interactions of 3-(Allylthio)- and 3-(Propargylthio)thieno[3,4-b]indolizine Derivatives
Various thieno indolizinederivatives having an allylthio or propargylthio group at the 3-position were prepared and their intramolecular arene-pi interactions were investigated. Their 1H-NMR spectra showed significant low-field shifts (delta 0.10-0.34 ppm) to the 5-proton on the thieno indolizine ring, and this effect was the reverse to that observed in 3-(arylmethylthio)thieno indolizines. However, their
Some ethyl 1 -benzoyl-3-[(un)substituted benzylthio]thieno[3,4-b]indolizine-9-carboxylates were prepared and their conformations were investigated. In the solid state and the chloroform solution they had stacked structures in which the phenyl ring and the pyridine moiety of theino[3,4-b]indolizine ring are partly overlapped.