The preparation of (5-aryl-3-isoxazolyl)-ferrocenes from dilithiated acetylferrocene oxime and aromatic esters
摘要:
Acetylferrocene oxime was dilithiated with excess lithium diisopropylamide and the resulting C(alpha),O-dilithiated oxime was condensed at the carbanion-type center with aromatic esters to yield C-acylated intermediates that were quenched and acid-cyclized to the (5-aryl-3-isoxazolyl)-ferrocenes (isoxazolyl-ferrocenes). The resulting products were isolated-in yields ranging from 20-76% and purified by recrystallization from ethanol.