Cyclisation of benzo[b]thiophen-3(2H)-one 1,1-dioxide and 1,3-indanedione into novel methylene bridged polycyclic diazocines and their rearrangement into spirocyclic compounds
作者:Brigita Cekavicus、Brigita Vigante、Martins Rucins、Aiva Plotniece、Karlis Pajuste、Marina Petrova、Sergey Belyakov、Gunars Duburs、Arkadij Sobolev
DOI:10.1016/j.tetlet.2014.06.106
日期:2014.8
Methylene bridged polycyclic diazocines 2a and 2b were obtained in reactions of 1,3-indanedione, or benzo[b]thiophen-3(2H)one-1,1-dioxide, or 2,2′-methylene derivatives 3a,b with paraformaldehyde and ammonia or hexamethylenetetramine in acidic medium. A structural revision of methylene bridged benzothieno-diazocine 2b based on results of X-ray diffraction analysis is presented. Internal rearrangement
亚甲基桥连的多环重氮化合物2a和2b是通过1,3-茚满二酮或苯并[ b ]噻吩-3(2 H)one-1,1-二氧化物或2,2'-亚甲基衍生物3a,b与酸性介质中的低聚甲醛和氨或六亚甲基四胺。基于X射线衍射分析的结果,提出了亚甲基桥接的苯并噻吩并重氮电影2b的结构修改。还描述了亚甲基桥连的多环重氮星在螺杂环4a,b内的内部重排。