Abstract: The use of P-phenylsulfinyl-a, P-unsaturated carbonyl dienophiles as synthetic equivalents of a, P-ethynyl carbonyl systems has been demonstrated. The sulfoxides were prepared by oxidation of the sulfides, which in turn were obtained from the (3-dicarbonyl systems by standard methods. A key feature of the scheme is that the phenylsulfinyl group does not compete with the carbonyl function in determining the regiochemistry of ...
