Photolysis of the 2-tetrazene gives the triazole by homolysis of one single N,N-bond. The formation of the other products – can be rationalized by regarding the aza-allyl radical as a common precursor.
Efficient and Flexible Access to Polysubstituted Pyrroles
作者:Claude Agami、Luc Dechoux、Séverine Hebbe
DOI:10.1055/s-2001-16790
日期:——
A series of polysubstituted pyrroles 3 have been synthesized very efficiently in two or three steps starting from primary amines 1. The key-step of this process is the bromocyclisation of δ-enaminoesters 2. The chemoselectivity of the reaction could depend on the nature of the solvent.
A series of 3-halo-2( 1H)-pyridinones 4 have been synthesized by treatment of δ-dienaminoesters 1 with N-halosuccinimide in basic medium. The chemoselectivity of the reaction is discussed.