1: phenylacetylene With n-butyllithium in tetrahydrofuran; hexane T=-78 - 0°C; 1 h; Inert atmosphere; 2: 3-(methoxycarbonyl)-propionyl chloride With boron trifluoride diethyl etherate in tetrahydrofuran; hexane T=-90 - -78°C; 2 h; Inert atmosphere;

lithium iodide in N,N,N',N',N'',N''-hexamethylphosphoric triamide; diethyl ether

chloroformic acid ethyl ester; triethylamine 1.) toluene, -20 deg C, 2 h, 2.) THF, -40 deg C, 1 h; Yield given. Multistep reaction;