An efficient one-step synthesis of a new series of multifunctional olefins

An efficient one-step procedure for the synthesis of a new series of multifunctional olefins by condensation of β-diketones as well as β-phosphonoesters and benzoylated β-ketoesters with formaldehyde, using potassium carbonate in refluxing THF, followed by a deacylation reaction, is herein described. In contrast, acetylated β-keto esters derivatives, only undergo a hydroxymethylation reaction, affording the corresponding α-hydroxymethyl β-keto esters in high yields.