1: 89 percent / I2; PPh3; imidazole / tetrahydrofuran 2: 98 percent / Zn / acetic acid; methanol / 20 °C 3: 60 percent / LDA / tetrahydrofuran / -78 - 20 °C 4: H2; quinoline / Pd/BaSO4 / ethyl acetate 5: Grubbs' catalyst / benzene / Heating 6: 100 percent / satd. HCl / methanol View Scheme

1: 89 percent / I2; PPh3; imidazole / tetrahydrofuran 2: 98 percent / Zn / acetic acid; methanol / 20 °C 3: 60 percent / LDA / tetrahydrofuran / -78 - 20 °C 4: H2; quinoline / Pd/BaSO4 / ethyl acetate 5: Grubbs' catalyst / benzene / Heating View Scheme