Multi-step reaction with 10 steps
1: 97 percent / NBS, NaOAc / tetrahydrofuran; H2O / 0.5 h / 0 °C
2: CrO3 / acetic acid / 0.5 h / Ambient temperature
3: sodium triacetoxyborohydride / propan-2-ol / 0.5 h / -20 °C
4: 83 percent / iPr2EtN, DMAP / CH2Cl2 / 10 h / Ambient temperature
5: 88 percent / AcOH, H2O / tetrahydrofuran / 8 h / 40 °C
6: 99 percent / Et3N, DMAP / CH2Cl2 / 5 h / Ambient temperature
7: 99 percent / iPr2EtN, DMAP / CH2Cl2 / 10 h / Ambient temperature
8: 98 percent / AcOH, H2O / tetrahydrofuran / 5 h / 40 °C
9: oxalyl chloride, DMSO / CH2Cl2 / 0.5 h
10: 78 percent / Et3N / 2 h / 0 °C
With
chromium(VI) oxide; dmap; N-Bromosuccinimide; oxalyl dichloride; water; sodium acetate; sodium tris(acetoxy)borohydride; acetic acid; dimethyl sulfoxide; triethylamine; N-ethyl-N,N-diisopropylamine;
In
tetrahydrofuran; dichloromethane; water; acetic acid; isopropyl alcohol;
DOI:10.1016/S0040-4020(99)00023-X