Multi-step reaction with 14 steps
1: 1.) NaCNBH3, AcOH, 2.) 2N aq. NaOH / 1.) 4 h
2: tetrahydrofuran / 22 h / Heating
3: 1.) sec-butyllithium, N,N,N',N'-tetramethylenediamine / 1.) Et2O, cyclohexane, -78 deg C, 1 h, 2.) Et2O, cyclohexane, 16 h
4: 30 percent / trifluoroacetic acid / 17 h
5: 90 percent / NaH / dimethylformamide / 1 h
6: 80 percent / 2,3-dichloro-5,6-dicyano-1,4-benzoquinone / dioxane / 0.25 h / 90 °C
7: 74 percent / BBr3 / CH2Cl2 / 1 h
8: 83 percent / NaH / dimethylformamide / 72 h
9: 80 percent / diphenyl ether / 16 h / Heating
10: 93 percent / 5N aq. NaOH / ethanol / 5 h / Heating
11: 82 percent / NaH / dimethylformamide / 18 h
12: CH2Cl2 / 1.5 h
13: NH3 gas / CH2Cl2 / 0.25 h
14: 95 percent / NaBH4 / ethanol / 16 h
With
sodium hydroxide; sodium tetrahydroborate; N,N,N,N,-tetramethylethylenediamine; ammonia; sec.-butyllithium; boron tribromide; sodium hydride; sodium cyanoborohydride; acetic acid; trifluoroacetic acid; 2,3-dicyano-5,6-dichloro-p-benzoquinone;
In
tetrahydrofuran; 1,4-dioxane; diphenylether; ethanol; dichloromethane; N,N-dimethyl-formamide;
DOI:10.1021/jm960486n