Synthesis of decahydropyrrolo[2,1,5-cd]indolizine derivatives through RuCl3/AgOTf induced alkene–alkene and alkene–arene double cycloisomerizations
作者:Peipei Cui、Liang Xu、Hao Cheng、Liangbing Gan
DOI:10.1016/j.tet.2011.10.071
日期:2012.1
In the presence of RuCl3/AgOTf, pyrrolizidine derivative with styrenyl substituents at the 3,5-positions undergo a 6-exo-trig cyclization and subsequent intramolecular Friedel–Crafts reactions to form decahydropyrrolo[2,1,5-cd]indolizine or decahydrocycl[3.2.2]azine derivatives. The cycloisomerization is highly stereoselective. Presence of electron donating groups on the styrenyl substituents inhibits
在RuCl 3 / AgOTf的存在下,在3,5-位带有苯乙烯基取代基的吡咯嗪核衍生物经历6- exo - trig环化,随后发生分子内Friedel-Crafts反应,形成十氢吡咯并[2,1,5- cd ]吲哚啉或十氢环[3.2.2]嗪衍生物。环异构化是高度立体选择性的。苯乙烯基取代基上的给电子基团的存在抑制了双环异构化过程,并导致了反式至顺式差向异构化。当在苯乙烯基取代基上存在吸电子基团时,没有反应发生。为观察到的反应提出了可能的机制。