Multi-step reaction with 8 steps
1: 1.) butyllithium / 1.) THF, hexane, -78 deg C to 0 deg C, ca. 0.5 h, 2.) THF, 0 deg C, 10 min
2: 95 percent / tetrabutylammonium fluoride / tetrahydrofuran / 2 h / Ambient temperature
3: triethylamine / CH2Cl2 / 0.5 h / 0 °C
4: 1.) sodium hydride, 2.) potassium iodide / 1.) THF, DMF, room temperature, 0.5 h, 2.) reflux, 48 h
5: 88 percent / pyridinium p-toluenesulfonate / methanol / 1.5 h / Heating
6: 100 percent / triethylamine / CH2Cl2 / 0 °C
7: 1.) sodium hydride / 1.) THF, DMF, room temperature, 0.5 h, 2.) room temperature, 10 h
8: 1.) sodium hydride, 2.) potassium iodide / 1.) THF, DMF, room temperature, 0.5 h, 2.) 85 deg C, 6 h
With
n-butyllithium; tetrabutyl ammonium fluoride; pyridinium p-toluenesulfonate; sodium hydride; triethylamine; potassium iodide;
In
tetrahydrofuran; methanol; dichloromethane;
DOI:10.1139/v92-297