1: 99 percent / PPh3; DIAD / CH2Cl2 / 0.67 h / -40 - -20 °C 2: 79 percent / H2 / Pd/C / methanol / 1 h / 760.05 Torr View Scheme

1: 95 percent / DCC 2: 84 percent / H2 / Ra-Ni 3: 1.) 2,4,6-trichlorobenzoyl chloride, iPr2NEt, 2.) HCl, 3.) O-benzotriazol-1-yl-N,N,N',N'-bis(pentamethylene)uroniumhexafluorophosphate, 4.) Bu4NF 4: 63 percent / Me3SiCl 5: 63 percent / PPh3 / H2O 6: 98 percent / K2CO3 / acetone View Scheme