期刊
CHEMICAL & PHARMACEUTICAL BULLETIN
卷 53, 期 11, 页码 1430-1438出版社
PHARMACEUTICAL SOC JAPAN
DOI: 10.1248/cpb.53.1430
关键词
thieno[3,4-b]indolizine; arene-pi interaction; gauche form; UV spectra; X-ray analysis
Various thieno[3,4-blindolizine derivatives having an allylthio or propargylthio group at the 3-position were prepared and their intramolecular arene-pi interactions were investigated. Their H-1-NMR spectra showed significant low-field shifts (delta 0.10-0.34 ppm) to the 5-proton on the thieno[3,4-blindolizine ring, and this effect was the reverse to that observed in 3-(arylmethylthio)thieno[3,4-b]lindolizines. However, their UV spectra exhibited a characteristic absorption band due to the arene-pi interaction near 430 nm and these values were almost similar to those for arene-arene interaction of 3-arylmethylthio derivatives though their molar extinction coefficients were largely varied by the 3-substituents. Furthermore, both types of gauche conformations in which the intramolecular arene-pi interactions are possible in one form and impossible in the other were confirmed by X-ray analyses of some compounds.
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