Preparation of New Nitrogen-Bridged Heterocycles. 53. Syntheses of 3-(Benzylthio)thieno[3,4-b]indolizine Derivatives and Their Intramolecular Arene-Arene Interactions.
作者:Akikazu Kakehi、Suketaka Ito、Hiroyuki Suga、Takeyuki Miwa、Takashi Mori、Tsuneo Fujii、Nobuaki Tanaka、Tomoshige Kobayashi
DOI:10.1248/cpb.51.75
日期:——
3-(benzylthio)thieno[3,4-b]indolizine derivatives showed significant high-field shifts (delta up to 0.3 ppm) for the 5- and 6-proton signals compared with those of the 3-methylthio derivatives in the (1)H-NMR spectra and exhibited a definite absorption band near 425 nm in their UV spectra, indicating an intramolecular arene-arene interaction between the thieno[3,4-b]indolizine and the phenyl ring.
通过新颖的方法,其中5-芳基羰基-4-的S-烷基化,以高收率合成了各种1-芳基羰基-3-[(未)取代的甲硫基]噻吩并[3,4-b]吲哚嗪-9-羧酸乙酯。将乙氧基羰基甲基-3-(1-吡啶基)噻吩-2-硫醇盐与烷基或苄基卤化物,在碱存在下将所得吡啶鎓盐进行1,5-偶极环化,并进行芳构化。在一些3-(苄硫基)硫代[3,4-b]吲哚并嗪-9-羧酸盐的X射线分析中,发现了与环外硫键有关的薄纱和两个反构象体。有趣的是,所有3-(苄硫基)噻吩并[3,4-b]吲哚并嗪衍生物均显示出显着的高场频移(δ直至0。