Multi-step reaction with 7 steps
1: 2.) 2,3-dichloro-5,6-dicyano-p-benzoquinone / 1.) THF, -70 deg C, 1 h, 2.) THF, 20 deg C, 1 h
2: 51 percent / DDQ / tetrahydrofuran / 1.5 h / 20 °C
3: 91 percent / NH3, H2 / Ni Raney / methanol / 2 h / 20 °C
4: 1.) NaNO2, 20percent aq. HBr, 2.) urea / 1.) H2O, 0 deg C, 15 min, 2.) from 0 to 100 deg C, 1 h
5: K2CO3, hydroquinone / dimethylsulfoxide / 1 h / 40 °C
6: 92 percent / glacial acetic acid / tetrahydrofuran / 48 h / Heating
7: CrO3, pyridine, Celite / CH2Cl2 / 1 h / 20 - 25 °C
With
pyridine; chromium(VI) oxide; Celite; ammonia; hydrogen bromide; hydrogen; potassium carbonate; acetic acid; hydroquinone; urea; 2,3-dicyano-5,6-dichloro-p-benzoquinone; sodium nitrite;
nickel;
In
tetrahydrofuran; methanol; dichloromethane; dimethyl sulfoxide;
DOI:10.1021/jm00114a004