Water → (E)-4-(5-methyl-2-phenyl-4-oxazolylmethoxy)benzylidenepyruvic acid

Beteiligte Stoffe

Reaktionsschritte

A mixture of 4-(5-methyl-2-phenyl-4-oxazolylmethoxy)benzaldehyde (2.9 g), sodium pyruvate (3.3 g), sodium carbonate (3.2 g), water (80 ml) and methanol (80 ml) was stirred for 6 hours under reflux. The reaction mixture was concentrated under reflux to about ⅓ of the initial volume. The concentrate was subjected to extraction with ethyl acetate. The aqueous layer was acidified with conc. HCl. Resulting crystalline precipitate was collected by filtration to obtain (E)-4-(5-methyl-2-phenyl-4-oxazolylmethoxy)benzylidenepyruvic acid (1.6 g, 44%). Recrystallization from chloroform-methanol gave colorless needles, m.p.197-198° C.

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