Multi-step reaction with 6 steps
1.1: pyridine / 0.5 h / 200 °C / Inert atmosphere; Microwave irradiation
2.1: sulfuric acid / 4.5 h / 120 °C / Inert atmosphere; Microwave irradiation
3.1: oxalyl dichloride; dimethyl sulfoxide / dichloromethane / 0.5 h / -78 °C / Inert atmosphere
3.2: 1.33 h / -78 - 20 °C / Inert atmosphere
4.1: methanol / 0.08 h / Inert atmosphere
4.2: 2 h / 20 °C / Inert atmosphere
5.1: water; lithium hydroxide / tetrahydrofuran / 20 °C / Inert atmosphere
6.1: O-(benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium tetrafluoroborate; N-ethyl-N,N-diisopropylamine / N,N-dimethyl-formamide / 16 h / 0 - 40 °C / Inert atmosphere
With
pyridine; oxalyl dichloride; sulfuric acid; water; O-(benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium tetrafluoroborate; dimethyl sulfoxide; N-ethyl-N,N-diisopropylamine; lithium hydroxide;
In
tetrahydrofuran; methanol; dichloromethane; N,N-dimethyl-formamide;
3.1: Swern oxidation / 3.2: Swern oxidation;
DOI:10.1016/j.bmc.2011.04.014