Multi-step reaction with 11 steps
1: 13 percent / pyridine / Ambient temperature
2: 81 percent / 1.) TFAA*Me2SO, 2.) TEA / CH2Cl2 / 1.5 h / -60 °C
3: NaBH4 / ethanol; CHCl3 / 1.5 h
4: 93 percent / NaOH (1N) / dioxane / 1 h / 65 - 70 °C
5: 93 percent / dimethylformamide / 18 h / 80 °C
6: 77 percent / NaOH (1N) / methanol / 1 h
7: 89 percent / 1.) TFAA*Me2SO, 2.) TEA / CH2Cl2 / 1.5 h / -60 °C
8: 1.) NaH / 1.) DMSO, 25 deg C, 10 min, 2.) DMSO, room temp., 30 min, 65-70 deg C, 30 min
9: 82 percent / H2 / Pd/C / ethanol / 50 °C / 2585.7 Torr / 1.) 24 h, 2.) fresh cat., H2O, 3 d
10: 2.07 g / HBr(48percent) / 0.25 h / Heating
11: NaOH / dioxane / 2 h / 65 - 70 °C
With
sodium hydroxide; sodium tetrahydroborate; TEA; hydrogen bromide; hydrogen; sodium hydride; trifluoroacetic anhydride;
palladium on activated charcoal;
In
1,4-dioxane; pyridine; methanol; ethanol; dichloromethane; chloroform; N,N-dimethyl-formamide;
DOI:10.1021/jo00159a005