Multi-step reaction with 9 steps
1: 1) N,N'-carbonyldiimidazole / 1) tetrahydrofuran, 30 min, 2) tetrahydrofuran, dimethyl sulfoxide, 4h, room temp.
2: 97 percent / H2 / RuBr2<(R)-binap> / ethanol / 145 h / 20 °C / 76000.1 Torr
3: 96 percent / aq. potassium hydroxide / dioxane / 8 h / 0 °C
4: H2 / 5percent Rh-Al2O3 / ethanol / 16 h / 3040 - 3800 Torr
5: 96 percent / DEPC, triethylamine / tetrahydrofuran / 6 h / 0 °C
6: 4N HCl / dioxane / 0.5 h / Ambient temperature
7: 91 percent / DEPC, triethylamine / tetrahydrofuran / 6 h / 0 °C
8: 4N HCl / dioxane / 0.5 h / Ambient temperature
9: 71 percent / DEPC, triethylamine / tetrahydrofuran / 8 h / 0 °C
With
hydrogenchloride; potassium hydroxide; hydrogen; triethylamine; diethyl dicarbonate; 1,1'-carbonyldiimidazole;
[(R)-BINAP]RuBr2; rhodium on alumina;
In
tetrahydrofuran; 1,4-dioxane; ethanol;
DOI:10.1248/cpb.38.103