1: 78 percent / camphorsulfonic acid / CH2Cl2; methanol / 4 h / 0 °C 2: 83 percent / PDC / dimethylformamide / 36 h / 20 °C 3: 81 percent / DCC; DMAP / CH2Cl2 / 14 h / 20 °C 4: 80 percent / CH2Cl2 / [Mo{(t-Bu)(3,5-dimethylphenyl)N}3] / toluene / 8 h / 80 °C 5: 99 percent / quinoline; H2 / Lindlar catalyst / hexane; CH2Cl2 / 8 h / 20 °C 6: 79 percent / aq. HF / acetonitrile; diethyl ether / 8 h / 20 °C View Scheme