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
作者:Akikazu Kakehi、Hiroyuki Suga、Yukihisa Okumura、Masatoshi Shinohara、Tomonao Kako、Takeshi Sekiguchi、Motoo Shiro
DOI:10.1248/cpb.57.1385
日期:——
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
由3-(1-吡啶基)噻吩-2-硫醇盐与α,α-二溴-邻,间或对二甲苯的S-烷基化反应生成的吡啶鎓盐进行碱处理和脱氢,提供了相应的α ,α'-双[(噻吩并[3,4-b]吲哚并-3-基]硫代]-邻,间和对二甲苯衍生物,收率低至好。这些产物的(1)H-NMR和UV-Vis光谱均明显支持了与两个硫化物键有关的gauche-gauche构象在这些分子中的间隔。另一方面,X射线分析表明间-和对-二甲苯衍生物具有预期的gauche-gauche构象,但邻-二甲苯衍生物具有抗-反构象。