REACTIONS DE CYCLOPROPENES ELECTROPHILES AVEC LES ENAMINES ET YNAMINES. CYCLOADDUITS BICYCLOPENTANIQUES ET ANALOGUES HALOCHRYSANTHEMIQUES

Article abstract of DOI:10.1016/S0040-4039(00)85172-2

Electrophilic cyclopropene esters mainly undergo formal cycloaddition reactions with ynamines and enamines.While the farmer reagents lead solely to cyclopentadiene enaminoesters, with the latter different products are formed, which can all be derived from a common zwitterionic intermediate.Enamines react in part with conservation of the cyclopropane ring, in contrast to their reactions with cyclopropenones and triafulvenes, thus allowing the synthesis of cyclopropane derivatives as illustrated here with halopyrethroids.