1: 94 percent / pyridine 2: 83 percent / LiEt3BH 3: 95 percent / TBAF 4: (COCl)2, DMSO, Et3N 5: 75 percent / CrCl2 6: 74 percent / Pd(PPh3)2Cl2, Et2NH, CuI 7: 80 percent / TsNHNH2, NaOAc 8: 80 percent / PPTS / ethanol / 16 h / 75 °C View Scheme