T. Sano et al., THERMAL CYCLOADDITION OF AROYLKETENE TO 1-ARYL-1-TRIMETHYLSILYLOXYETHYLENE - A SIMPLE SYNTHESIS OF 2,6-DIARYL-4H-PYRAN-4-ONE, Heterocycles, 36(9), 1993, pp. 2139-2145
Aroylketene (2) generated by pyrolytic decarbonylation of 5-aryl-2,3-d
ihydro-2,3-furandione (1) reacted with 1-aryl-1-trimethylsilyloxyethyl
ene (3) in a regioselective manner to give 2,6-diaryl-4H-pyran-4-one (
5) and/or 1,5-diarylpentane-1,3,5-trione (6). This reaction provides a
simple synthetic method of 2,6-diaryl-4H-pyran-4-one with various sub
stituents in the aryl group.