Multi-step reaction with 9 steps
1: 90 percent / 2N aq. NaOH / dioxane / 18 h / 60 °C
2: 1.) N-ethyl-N'-<3-(dimethylamino)propyl>carbodiimide hydrochloride, 1-hydroxybenzotriazole, N-methylmorpholine / 1.) EtOAc, 30 min, 2.) EtOAc, 16 h
3: 60 percent / 4N HCl / dioxane / 18 h / Ambient temperature
4: 80 percent / propan-2-ol / 18 h / Heating
5: 68 percent / MeSO3H / toluene / 1 h / 110 °C
6: 1.) NaCNBH3, p-TsOH, 2.) aq. K2B4O7 / 1.) THF, 18 h, 2.) MeOH, THF, RT, overnight
7: 42 percent / propan-2-ol / 16 h / Heating
8: 100 percent / 2N aq. HCl / tetrahydrofuran / 8 h / 50 °C
9: 1.) O-(1,2-dihydro-2-oxo-1-pyridyl)-N,N,N',N'-tetramethyluronium tetrafluoroborate, 2.) N-methylmorpholine / 1.) DMF, 10 min, 2.) DMF, 16 h
With
4-methyl-morpholine; hydrogenchloride; sodium hydroxide; methanesulfonic acid; potassium tetraborate; sodium cyanoborohydride; benzotriazol-1-ol; O-(1,2-dihydro-2-oxo-1-pyridyl)-N,N,N',N'-tetramethyluronium tetrafluoroborate; toluene-4-sulfonic acid; 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride;
In
tetrahydrofuran; 1,4-dioxane; isopropyl alcohol; toluene;
DOI:10.1021/jm970873c