Multi-step reaction with 6 steps
1: potassium carbonate / water; acetonitrile
2: sodium hydroxide / ethanol / 20 °C / Reflux
3: O-(1H-benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium hexafluorophosphate; N-ethyl-N,N-diisopropylamine / N,N-dimethyl-formamide / 4 h / 50 °C / Inert atmosphere
4: sodium hydroxide / methanol; water / 2 h / 70 °C
5: O-(1H-benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium hexafluorophosphate; N-ethyl-N,N-diisopropylamine / N,N-dimethyl-formamide / 4 h / 0 - 20 °C
6: acetic acid / 2 h / Reflux
With
potassium carbonate; O-(1H-benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium hexafluorophosphate; acetic acid; N-ethyl-N,N-diisopropylamine; sodium hydroxide;
In
methanol; ethanol; water; N,N-dimethyl-formamide; acetonitrile;
DOI:10.1016/j.bmcl.2012.04.104