Multi-step reaction with 10 steps
1.1: 100 percent / pyridine / 5 h
2.1: 64 percent / NaH / dimethylformamide / 2 h / 22 °C
3.1: 78 percent / aq. AcOH / 1.5 h / 60 °C
4.1: 62 percent / p-toluenesulfonic acid / acetonitrile / 22 °C
5.1: 59 percent / NaH / dimethylformamide / 22 °C
6.1: 82 percent / t-BuOK / 2-methyl-propan-2-ol; tetrahydrofuran; dimethylformamide / 50 - 60 °C
7.1: 2,6-di-tert-butyl-4-methylpyridine / acetonitrile / 22 °C
7.2: 25 percent / dimethyl(methylthio)sulfonium triflate / acetonitrile
8.1: H2S / pyridine; H2O
8.2: 68 percent / aq. AcONa / tetrahydrofuran / 22 °C
9.1: 89 percent / 2,3-dichloro-5,6-dicyano-1,4-benzoquinone / CH2Cl2; H2O / 5 - 23 °C
10.1: 84 percent / aq. CF3COOH / CH2Cl2 / 0 °C
With
2,6-di-tert-butyl-4-methylpyridine; hydrogen sulfide; potassium tert-butylate; sodium hydride; toluene-4-sulfonic acid; acetic acid; trifluoroacetic acid; 2,3-dicyano-5,6-dichloro-p-benzoquinone;
In
tetrahydrofuran; pyridine; dichloromethane; water; N,N-dimethyl-formamide; acetonitrile; tert-butyl alcohol;
DOI:10.1016/S0968-0896(01)00015-3