M. Gelmi, D. Pocar
1992
Citations
0
Influential Citations
10
Citations
Journal
Synthesis
Abstract
The reaction of 4-ethoxymethylene-5(4H)-oxazolone (2 a) with ethyl 3-oxo-4-(triphenylphosphoranylidene)butyrate (1) affords ethyl 3-benzoylamino-2-oxo-6-triphenylphosphoranylidenemethyl-2H-pyran-5-carboxylate (3). Starting from the corresponding 4-chloromethylene compound 2b and 1, besides 3, ethyl 3-benzoylamino-6-[2-(4,5-dihydro-5-oxo-2-phenyl-4-oxazolylidene)-1- (triphenylphosphoranylidene)ethyl]-2-oxo-2H-pyran-5-carboxylate (5) is formed