Multi-step reaction with 8 steps
1: 90 percent / NaH / tetrahydrofuran / 1 h / Heating
2: 1.) borane-trimethylamine complex, 4 Angstroem molecular sieves, 2.) AlCl3 / 1.) THF, 1 h, 2.) 5 h
3: 1.) 4 Angstroem molecular sieves, 2.) silver triflate / 1.) CH2Cl2, toluene, 30 min, 2.) toluene, -40 deg C, 2 h
4: 99 percent / NaOMe / methanol
5: 82 percent / p-toluenesulfonic acid monohydrate / 0.5 h
6: 87 percent / Ac2O-Me2SO / 16 h / Ambient temperature
7: 53 percent / NaBH4 / CH2Cl2; propan-2-ol / 0.17 h / 0 °C
8: 1.) 4 Angstroem molecular sieves, 2.) silver triflate / 1.) CH2Cl2, toluene, 30 min, 2.) toluene, -45 deg C, 20 min
With
sodium tetrahydroborate; aluminium trichloride; trimethylamine-borane; 4 A molecular sieve; sodium methylate; silver trifluoromethanesulfonate; acetic anhydride; sodium hydride; toluene-4-sulfonic acid; dimethyl sulfoxide;
In
tetrahydrofuran; methanol; dichloromethane; isopropyl alcohol;
DOI:10.1016/0008-6215(93)87009-H