Tsuji–Trost allylation of CH acids in supercritical carbon dioxide: advantages and problems
摘要:
The Pd(PPh3)(4)-catalyzed reaction between alpha-cyano or beta-oxo carboxylates and allyl acetate in supercritical carbon dioxide with the K2CO3-18-crown-6 system as a base affords exhaustive allylation products in high yields, whereas malononitrile and acetylacetone of higher CH acidity form the mixtures of mono- and diallylated derivatives in moderate yields.