Synthesis of (Z)-2-[(Z)-3-Alkylideneisobenzofuran-1(3H)-ylidene]acetic Acid Derivatives by Sequential Coupling-Cyclization between 3-(2-Iodophenyl)-3-oxopropanoic Acid Derivatives and Terminal Alkynes
Synthesis of (<i>Z</i>)-2-[(<i>Z</i>)-3-Alkylideneisobenzofuran-1(3<i>H</i>)-ylidene]acetic Acid Derivatives by Sequential Coupling-Cyclization between 3-(2-Iodophenyl)-3-oxopropanoic Acid Derivatives and Terminal Alkynes
3-(2-Iodophenyl)-3-oxopropanoic acid derivatives reacted efficiently with various terminal alkynes in the presence of catalytic amounts of dichlorobis(triphenylphosphine)palladium and copper(I) iodide and two molar amounts of triethylamine in N,N-dimethylformamide at room temperature to afford the corresponding (Z)-2-[(Z)-3-alkylideneisobenzofuran-1(3H)-ylidene]acetic acid derivatives in reasonable yields.