Multi-step reaction with 7 steps
1: 1.) Bu2SnO, 2.) CsF, NaI / 1.) MeOH, reflux, 2 h, 2.) DMF, r.t., 18 h
2: 89 percent / pyridine / 1.5 h / Ambient temperature
3: 97 percent / 4 Angstroem molecular sieves, NIS, TfOH / 1,2-dichloro-ethane; diethyl ether / 0.08 h / 0 °C
4: 88 percent / DDQ / CH2Cl2; H2O / 1 h / Ambient temperature
5: 1.) 4 Angstroem molecular sieves, 2.) NIS, TfOH / 1.) 1,2-dichloroethane, diethyl ether, r.t., 20 min, 2.) -30 deg C, 15 min
6: 81 percent / DDQ / CH2Cl2; H2O / 0.75 h / Ambient temperature
7: 1.) 4 Angstroem molecular sieves, 2.) NIS, TfOH / 1.) 1,2-dichloroethane, diethyl ether, r.t., 20 min, 2.) 0 deg C, 15 min
With
pyridine; N-iodo-succinimide; trifluorormethanesulfonic acid; 4 A molecular sieve; di(n-butyl)tin oxide; cesium fluoride; 2,3-dicyano-5,6-dichloro-p-benzoquinone; sodium iodide;
In
diethyl ether; dichloromethane; water; 1,2-dichloro-ethane;
DOI:10.1080/07328309608005677