名称:
(Cyanomethylene)phosphoranes as Novel Carbonyl 1,1-Dipole Synthons: An Efficient Synthesis of .alpha.-Keto Acids, Esters, and Amides
摘要:
Carboxylic acids react with (cyanomethylene)triphenylphosphorane in the presence of EDCI to form cyano keto phosphoranes. The resulting ylides may then be oxidatively cleaved with ozone to form alpha,beta-diketonitriles. These highly electrophilic products may then be converted in situ to alpha-keto acids, esters, and amides.