1: 94 percent / TBAF 2: 84 percent / Et3N, DMAP 3: 94 percent / pyridine 4: 83 percent / LiEt3BH 5: 95 percent / TBAF 6: (COCl)2, DMSO, Et3N 7: 75 percent / CrCl2 8: 74 percent / Pd(PPh3)2Cl2, Et2NH, CuI 9: 80 percent / TsNHNH2, NaOAc 10: 80 percent / PPTS / ethanol / 16 h / 75 °C View Scheme