Multi-step reaction with 8 steps
1: 25 percent / NaBH4 / methanol; tetrahydrofuran / 0.17 h / ice-cooling
2: imidazol / dimethylformamide / Ambient temperature
3: acetic acid, tetraethylammonium fluoride dihydrate / tetrahydrofuran / 0.5 h / Ambient temperature
4: 84 percent / triethylamine / tetrahydrofuran / Ambient temperature
5: 1.) 2,6-lutidine, thionyl bromide; 2.) 2,6-lutidine / 1.) THF, -35 degC, 30 min; 2.) THF, room temperature
6: 1.) AgNO3, pyridine; 2.) pyridine / 1.) MeOH/THF, 30 min, room temperature; 2.) CH2Cl2, -45 degC to 0 degC, 1 h
7: tert-Bu4NBr / CH2Cl2; H2O / 2 h / Ambient temperature
8: 1N HCl / methanol; acetonitrile / 1.5 h / Ambient temperature
With
pyridine; 1H-imidazole; 2,6-dimethylpyridine; hydrogenchloride; sodium tetrahydroborate; dibromo sulfoxide; tetraethylammonium fluoride; silver nitrate; acetic acid; triethylamine;
tetrabutylammomium bromide;
In
tetrahydrofuran; methanol; dichloromethane; water; N,N-dimethyl-formamide; acetonitrile;
DOI:10.1248/cpb.33.4382