Multi-step reaction with 16 steps
1: 95 percent / tetrahydrofuran / 18 h / 25 °C
2: NaI / acetone / 1.5 h
3: tetrahydrofuran / 16 h / 1) 0 deg C 2) 16h, room temperature
4: 1) PPA / 1) 30 min, 60 deg C 2) THF, water, HCl, 2h
5: hydrogen chloride gas / Ambient temperature
6: 93 percent / KOH / tetrahydrofuran; methanol; H2O / 2 h / 25 °C
7: 90 percent / 1,2-dichloro-ethane / 3 h / Heating
8: 8.1 g / oxalyl chloride, DMF / CH2Cl2 / 1) 0 deg C 2) room temperature
9: 8.0 g / diethyl ether; CH2Cl2 / 1) -20 deg C 2) room temperature
10: 71 percent / CF3CO2H / CH2Cl2 / 0.42 h / -20 °C
11: 89 percent / K2CO3, KHCO3 / tetrahydrofuran; methanol; H2O / 1) 1h, reflux 2) 0 deg C 3) 1.5h, 20 deg C
12: 95 percent / p-toluenesulfonic acid / 1,2-dichloro-ethane / 16 h / Heating
13: 98 percent / N-diisopropyl-N-ethylamine / CH2Cl2 / 1) 0 deg C 2) 16h, 25 deg C
14: 1) lithium tert-butylcyclohexylamide, HMPA / 1) THF, -20 deg C 2) -78 deg C -> room temperature
15: 91 percent / H2 / 10percent Pd/C / methanol; ethyl acetate / 16 h / 760 Torr / Ambient temperature
16: 86 percent / K2CO3 / dimethylformamide / 16 h
With
hydrogenchloride; N,N,N,N,N,N-hexamethylphosphoric triamide; potassium hydroxide; oxalyl dichloride; lithium N-tert-butyl-N-cyclohexylamide; hydrogen; potassium carbonate; potassium hydrogencarbonate; N-ethyl-N,N-diisopropylamine; N,N-dimethyl-formamide; trifluoroacetic acid; sodium iodide;
palladium on activated charcoal; toluene-4-sulfonic acid;
In
tetrahydrofuran; methanol; diethyl ether; dichloromethane; water; ethyl acetate; 1,2-dichloro-ethane; N,N-dimethyl-formamide; acetone;
DOI:10.1021/jo00192a002