Multi-step reaction with 6 steps
1: 1.) n-BuLi, 2.) HMPA / 1.) THF, hexane, -78 deg C, 1 h, 2.) THF, hexane, a) -55 deg C, b) RT, 16 h
2: 10percent aq. citric acid / tetrahydrofuran / 48 h / Ambient temperature
3: Et3N / tetrahydrofuran / 2 h / Ambient temperature
4: 50 percent / 0.5 N aq. LiOH / tetrahydrofuran / 4 h / Ambient temperature
5: 1.) DIEA, (benzotriazol-1-yloxy)tris(dimethylamino)phosphonium hexafluorophosphate, 2.) DIEA / 1.) DMF, 0 deg C, 30 min, 2.) DMF, RT, overnight
6: 100 percent / H2 / 10percent Pd/C / methanol / Ambient temperature
With
N,N,N,N,N,N-hexamethylphosphoric triamide; lithium hydroxide; n-butyllithium; hydrogen; (benzotriazo-1-yloxy)tris(dimethylamino)phosphonium hexafluorophosphate; triethylamine; N-ethyl-N,N-diisopropylamine; citric acid;
palladium on activated charcoal;
In
tetrahydrofuran; methanol;
DOI:10.1021/jm9603072