1: iodobenzene With tert.-butyl lithium in tetrahydrofuran; pentane T=-78°C; 0.5 h; 2: (2RS,4SR)-acetic acid 4-hydroxycyclopent-2-enyl ester in tetrahydrofuran; pentane T=0°C; 1 h;

triethylamine in tetrahydrofuran 5 h; Ambient temperaturepancreatin;

methanol; potassium carbonate in diethyl ether 4 h;