Multi-step reaction with 8 steps
1: 76 percent / formic acid / 0.5 h / Ambient temperature
2: 82 percent / barium oxide, barium hydroxide octahydrate / dimethylformamide / 2 h / Ambient temperature; 1.) N,N-dimethylformamide, RT, 2 h, 2.) chloroform, reflux, 2 h
3: 78 percent / 60 percent aq. acetic acid / 2 h / 90 - 95 °C
4: 84 percent / pyridine / 30 h / Ambient temperature
5: 89 percent / NaOH / dimethylformamide / 5 h / Ambient temperature
6: 79 percent / 60 percent aq. acetic acid / 2 h / 90 °C
7: 56 percent / KOH / benzene; dimethylformamide / 3 h / Ambient temperature
8: 1.) NaBH4, 2.) dicyclohexylcarbondiimide / 1.) DMF, 6 h, 0 deg C, 2.) CH2Cl2, RT, 16 h
With
pyridine; potassium hydroxide; sodium hydroxide; sodium tetrahydroborate; formic acid; barium hydroxide octahydrate; acetic acid; dicyclohexyl-carbodiimide; barium(II) oxide;
In
N,N-dimethyl-formamide; benzene;
DOI:10.1246/bcsj.54.3570