Multi-step reaction with 7 steps
1: 95 percent / H2SO4 / diethyl ether
2: 1.) LDA, HMPA, 2.) 10percent aq. citric acid / 1.) THF, -78 deg C, 2.) Et2O, RT, 48 h
3: 1.) DIEA, (benzotriazol-1-yloxy)tris(dimethylamino)phosphonium hexafluorophosphate, 2.) DIEA / 1.) DMF, 0 deg C, 30 min, 2.) DMF, RT, overnight
4: 100 percent / anisole / CH2Cl2 / 3 h / 0 - 20 °C
5: 29 percent / NaHCO3, (benzotriazol-1-yloxy)tris(dimethylamino)phosphonium hexafluorophosphate / dimethylformamide / 5 h / Ambient temperature
6: 100 percent / 1 N aq. NaOH / methanol / Ambient temperature
7: 1.) DIEA, (benzotriazol-1-yloxy)tris(dimethylamino)phosphonium hexafluorophosphate, 2.) DIEA / 1.) DMF, 0 deg C, 30 min, 2.) DMF, RT, overnight
With
N,N,N,N,N,N-hexamethylphosphoric triamide; sodium hydroxide; sulfuric acid; sodium hydrogencarbonate; (benzotriazo-1-yloxy)tris(dimethylamino)phosphonium hexafluorophosphate; methoxybenzene; N-ethyl-N,N-diisopropylamine; citric acid; lithium diisopropyl amide;
In
methanol; diethyl ether; dichloromethane; N,N-dimethyl-formamide;
DOI:10.1021/jm9603072