Multi-step reaction with 9 steps
1: 1.) (NH4)23)6>, NaN3 / 1.) EtOAc, CH3CN, -40 deg C, 6 d; 2.) glacial acetic acid, 100 deg C, 1 h
2: 98 percent / TiBr4 / CH2Cl2; ethyl acetate / 144 h
3: 89 percent / molecular sieves 4 Angstroem / Ag2SiO3 / toluene / 5 h / -30 °C
4: 98 percent / sodiummethoxide / methanol / 5 h / Ambient temperature
5: pyridine / 1 h / 80 °C
6: 97 percent / NaH / dimethylformamide / 2 h / Ambient temperature
7: 78 percent / aq. acetic acid / tetrahydrofuran / 1 h / 80 °C
8: 76 percent / dimethylsulfoxide, acetic anhydride / 16 h / Ambient temperature
9: 81 percent / I2 / 40 °C
With
pyridine; sodium azide; ammonium cerium(IV) nitrate; 4 A molecular sieve; iodine; sodium methylate; acetic anhydride; titanium(IV) bromide; sodium hydride; acetic acid; dimethyl sulfoxide;
silver silicate;
In
tetrahydrofuran; methanol; dichloromethane; ethyl acetate; N,N-dimethyl-formamide; toluene;
DOI:10.1016/0008-6215(85)85193-4