Multi-step reaction with 6 steps
1.1: boron trifluoride diethyl etherate / dichloromethane / 17 h / 20 °C / Inert atmosphere
2.1: methanol; sodium methylate / 20 °C / Inert atmosphere
3.1: di(n-butyl)tin oxide / methanol / 28 h / Inert atmosphere; Reflux
3.2: 3 h / Inert atmosphere; Reflux
4.1: water; sodium hydroxide / methanol / 0.67 h / 20 °C / Inert atmosphere
4.2: acid resin treatment
5.1: pyridine; dmap / 48 h / 20 °C / Inert atmosphere
6.1: O-(benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium tetrafluoroborate; N-ethyl-N,N-diisopropylamine / dichloromethane; N,N-dimethyl-formamide / 2.5 h / 20 °C / Inert atmosphere
With
pyridine; methanol; dmap; boron trifluoride diethyl etherate; water; sodium methylate; di(n-butyl)tin oxide; O-(benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium tetrafluoroborate; N-ethyl-N,N-diisopropylamine; sodium hydroxide;
In
methanol; dichloromethane; N,N-dimethyl-formamide;
DOI:10.1016/j.bmc.2011.03.022