Multi-step reaction with 12 steps
1: 84 percent / NaBH4 / methanol / 0.25 h / 0 °C
2: 90 percent / DMSO / 0.5 h / 180 °C
3: 94 percent / H2 / 10percent Pd/C / ethanol / 2 h / 25 °C / 760 Torr
4: 100 percent / pyridine hydrochloride / 4 h / 180 °C
5: 100 percent / Dowex 50W*8 (H+ form) / benzene; tetrahydrofuran / 2 h / Heating
6: 1.) ethyl chloroformate, Et3N / 1.) THF, -15 deg C, 15 min, 2.) THF, a) -10 deg C, 10 min, b) 25 deg C, 30 min
7: 166 g / aq. NaOH / ethanol / 1 h / Heating
8: 73 percent / H2SO4 / 16 h / Heating
9: 1.) NaH / 1.) DMF, a) 0 deg C, 10 min, b) 25 deg C, 30 min, 2.) DMF, 75 deg C, 1 h
10: p-TsOH*H2O / methanol / 0.5 h / 45 °C
11: 1.) (COCl)2, DMSO, 2.) Et3N / 1.) CH2Cl2, -70 deg C, 30 min, 2.) CH2Cl2, 0 deg C, 5 min
12: 1.) NaH / 1.) THF, a) 0 deg C, 10 min, b) 25 deg C, 30 min, 2.) THF, 25 deg C, 1 h
With
sodium hydroxide; sodium tetrahydroborate; oxalyl dichloride; Dowex 50W*8 (H+ form); sulfuric acid; hydrogen; pyridine hydrochloride; chloroformic acid ethyl ester; sodium hydride; toluene-4-sulfonic acid; dimethyl sulfoxide; triethylamine;
palladium on activated charcoal;
In
tetrahydrofuran; methanol; ethanol; benzene;
DOI:10.1016/S0968-0896(97)00090-4