Ring-Opening/Ring-Closing Protocols from Nitrothiophenes: Easy Access to<i>N</i>-Fused Pyrroles through a Tandem 1,6-H Shift/6π-Electrocyclization
作者:Lara Bianchi、Massimo Maccagno、Giovanni Petrillo、Carlo Scapolla、Cinzia Tavani、Alessandra Tirocco
DOI:10.1002/ejoc.201301236
日期:2014.1
amines and proper modification of the resulting 1,3-diene enables a simple and versatile approach to N-fused pyrroles of both synthetic and biological interest through 1,6-H shift followed by 6π 1,5-electrocyclization. This protocol is effectively driven to the isolated pyrroles by an easy aromatization.
3-硝基-4-(苯磺酰基)噻吩与胺的开环和所得 1,3-二烯的适当修饰使得通过 1,6-H 获得具有合成和生物学意义的 N-稠合吡咯的简单而通用的方法移位,然后是 6π 1,5-电环化。该协议通过简单的芳构化有效地驱动到分离的吡咯。