Multi-step reaction with 9 steps
1: 15.0 g / Et3N, (dimethylamino)pyridine / CH2Cl2 / 1.) 0 to 25 deg C, 1 h, 2.) 25 deg, 18 h
2: 1.) hydroxybenzotriazole, 1-ethyl-3-<3-(dimethylamino)propyl>carbodiimide / 1.) CH2Cl2, 0 deg C, 1.5 h, 2.) CH2Cl2, 0 deg C, 2 h
3: 79 percent / BF3*OEt2 / CH2Cl2 / 2 h / 25 °C
4: 52 percent / NaH / tetrahydrofuran / 1 h / -78 - 25 °C
5: 70 percent / 4-(N,N-dimethylamino)pyridine / CH2Cl2 / 2 h / 25 °C
6: 79 percent / aq. H2O2, LiOH hydrate / tetrahydrofuran / 0.5 h / 5 - 25 °C
7: 1.) 1-ethyl-3-<3-(dimethylamino)propyl>carbodiimide, (dimethylamino)pyridine / 1.) CH2Cl2, 25 deg C, 30 min, 2.) CH2Cl2, 15 min
8: 1.) Zn dust, AcOH, 2.) CF3COOH / 1.) sonication, 45 min, then room temp., 30 min, 2.) room temp., 2 h
9: 47 percent / diisopropylethylamine, pentafluorophenyl diphenylphosphinate / dimethylformamide / 4 h / Ambient temperature
With
dmap; lithium hydroxide; boron trifluoride diethyl etherate; pentafluorophenyl diphenyl-phosphinate; dihydrogen peroxide; sodium hydride; benzotriazol-1-ol; acetic acid; N-(3-dimethylaminopropyl)-N-ethylcarbodiimide; triethylamine; N-ethyl-N,N-diisopropylamine; trifluoroacetic acid; zinc;
In
tetrahydrofuran; dichloromethane; N,N-dimethyl-formamide;
DOI:10.1021/jo980536r