Synthesis of substituted disulfonyl-containing polycyclic azines with the bridgehead nitrogen atom. Effects of the structure of 3-substituted pyridinium ylides on the regioselectivity of their reactions with E-1,2-di(alkylsulfonyl)-1,2-dichloroethenes
作者:N. E. Dontsova、A. M. Shestopalov
DOI:10.1007/s11172-017-1851-3
日期:2017.6
Heating the substituted pyridinium and isoquinolinium salts with E-1,2-di(alkylsulfonyl)-1,2-dichloroethenes in either chloroform or acetone in the presence of three-fold excess of Et3N gave high yields of substituted 1,2-di(alkylsulfonyl)indolizines and 1,2-di(alkylsulfonyl) pyrrolo[2,1-a]isoquinolines, respectively. Effects of the structure of 3-substituted pyridinium ylides on the regioselectivity
在三倍过量的 Et3N 存在下,在氯仿或丙酮中加热取代的吡啶鎓盐和异喹啉鎓盐与 E-1,2-二(烷基磺酰基)-1,2-二氯乙烯,得到高产率的取代 1,2-二(分别为烷基磺酰基)茚和 1,2-二(烷基磺酰基)吡咯并[2,1-a]异喹啉。揭示了 3-取代吡啶鎓叶立德的结构对其与 E-1,2-二(烷基磺酰基)-1,2-二氯乙烯反应的区域选择性的影响。结果表明,吡啶鎓叶立德中释放电子和吸电子取代基的存在分别有利于8-取代和6-取代的1,2-(二烷基磺酰基)茚茚的形成。