Abstract
Electrophilic cyclopropene esters mainly undergo formal cycloaddition reactions with ynamines and enamines. While the former reagents lead solely of 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 cyclopropene derivatives as illustrated here with halopyrethroids.
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