SYNTHESIS OF HIGHLY FUNCTIONALIZED PHOSPHORUS YLIDES BY ONE-POT AND THREE-COMPONENT REACTION

Three-component reaction between dialkyl acetylenedicarboxylate and triphenylphosphine in the presence of NH-acids including 5-fluoroisatin and 5-benzylidene-2-thioxothiazolidin-4-one leds to vinylphosphonium salts which undergo Michael addition with the conjugate base of the NH-acid to produce highly functionalized, salt-free phosphorus ylides in excellent yields.