methanesulfonic acid in dichloromethane T=0°C;

1: CH3SO3H / CH2Cl2 / 0 °C 2: 1.) NaH / 1.) DMF, 0 deg C, 5 min, 2.) DMF, 23 deg C, 40 min 3: 99 percent / piperidine, acetic acid / benzene / 18 h / 23 °C 4: 94 percent / Et3N, HCOOH, Pd(PPh3)4 / 4 h / 23 °C 5: (PhO)2P(O)N3, Et3N, 4 Angstroem molecular sieves / toluene / 2 h / 70 °C 6: 1 h / 23 °C 7: 97 percent / H2, Rh<(COD)-(R,R)-DIPAMP>(+)*BF4(-) / 16 h / 23 °C / 2280 Torr 8: BF3*Et2O, H2O / CH2Cl2 / 0.17 h / 0 °C 9: BF3*Et2O, 4 Angstroem molecular sieves / CH2Cl2 / 18 h / 23 °C 10: 100 percent / H2 / 10percent Pd/C / ethyl acetate / 6 h / 23 °C / 760 Torr 11: 61 percent / HOAc / 18 h / 23 °C 12: 87 percent / Cs2CO3 / dimethylformamide / 1 h / 23 °C 13: diisobutylaluminum hydride / toluene / 5 h / -78 °C 14: KF*2H2O / methanol / 0.33 h / 23 °C 15: CH3SO3H, 3 Angstroem molecular sieves / CH2Cl2 / 5 h / 23 °C 16: 72 percent / Et3N, DMAP / CH2Cl2 / 6 h / 23 °C 17: 89 percent / DMAP / CH2Cl2 / 13 h / 23 °C 18: 92 percent / i-Pr2NEt / CH2Cl2 / 0.33 h / 23 °C 19: 1.) Bu3SnH, PdCl2(PPh3)2, HOAc, 2.) NaBH3CN, HOAc / 1.) CH2Cl2, 23 deg C, 15 min, 2.) CH3CN, 23 deg C, 30 min 20: 83 percent / PdCl2(PPh3)2, LiCl / dimethylformamide / 2 h / 80 °C 21: (PhSeO)2O / CH2Cl2 / 0.25 h / 23 °C 22: Bu4NF / tetrahydrofuran / 0.17 h / 23 °C 23: 91 percent / 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride, DMAP / CH2Cl2 / 0.5 h / 23 °C 24: 0.5 h / -40 °C 25: 1.) i-Pr2NEt, 2.) tert-butyl alcohol, N-tert-butyl-N',N',N'',N''-tetramethylguanidine / 1.) 0 deg C, 30 min, 2.) 23 deg C 26: 23 °C 27: 84 percent / PdCl2(PPh3)2, Bu3SnH, HOAc / CH2Cl2 / 0.08 h / 23 °C 28: 70 percent / <N-methylpyridinium-4-carboxaldehyde>iodide, 1,8-diazabicyclo<6.4.0>undec-7-ene, DMF / CH2Cl2 / 0.67 h / 23 °C 29: 82 percent / silica gel / ethanol / 23 °C 30: aq. CF3COOH / tetrahydrofuran / 9 h / 23 °C 31: aq. AgNO3 / acetonitrile / 11 h / 23 °C View Scheme