Novel indole syntheses by ring transformation of β-lactam-condensed 1,3-benzothiazines into indolo[2,3-b][1,4]benzothiazepines and indolo[3,2-c]isoquinolines
作者:Lajos Fodor、Péter Csomós、Antal Csámpai、Pál Sohár
DOI:10.1016/j.tet.2011.11.036
日期:2012.1
with sodium methoxide in methanol provided indolo-1,4-benzothiazepines via a novel rearrangement. Through the sulfur extrusion reaction of indolo[2,3-b][1,4]benzothiazepines, further alkaloid-type indole derivatives, indolo[3,2-c]isoquinolines, were obtained. The structures of the new ring systems were determined by means of NMR spectroscopy.
事实证明,在非还原条件下,邻-硝基苯基取代的稠合1,3-苯并噻嗪是吲哚合成中有用的核心单元。因此,用甲醇钠在甲醇中处理邻-硝基-2-芳基-2a-氯-4 H-氮杂[2,1 - b ] [1,3]苯并噻嗪-1-酮提供了吲哚-1,4-苯并硫氮杂via通过新颖的重排。通过吲哚并[2,3- b ] [1,4]苯并硫氮杂卓的硫磺挤出反应,进一步获得了生物碱型吲哚衍生物,吲哚并[3,2- c ]异喹啉。新环系统的结构通过NMR光谱法确定。