Multi-step reaction with 8 steps
1.1: oxalyl dichloride / dichloromethane; N,N-dimethyl-formamide / 20 °C / Inert atmosphere; Cooling with ether-dry ice
2.1: triethylamine / tetrahydrofuran / 3.67 h / 20 °C / Inert atmosphere; Cooling with ice
3.1: potassium tert-butylate / tetrahydrofuran / 1.5 h / -40 °C / Inert atmosphere; Cooling with acetone-dry ice
3.2: -40 °C / Inert atmosphere
4.1: sodium tetrahydroborate / tetrahydrofuran; methanol / 0.37 h / Inert atmosphere; Cooling with CCl4-dry ice
5.1: toluene-4-sulfonic acid / dichloromethane; water / 20 °C / Inert atmosphere
6.1: dmap; triethylamine / dichloromethane / 2 h / 20 °C / Inert atmosphere
7.1: water; sodium hydrogencarbonate; bis-[(trifluoroacetoxy)iodo]benzene / acetonitrile / 0.38 h / 20 °C / Inert atmosphere
8.1: tri-n-butyl-tin hydride; 1,1'-azobis(1-cyanocyclohexanenitrile) / toluene / 7 h / Inert atmosphere; Reflux
With
dmap; sodium tetrahydroborate; oxalyl dichloride; potassium tert-butylate; water; tri-n-butyl-tin hydride; sodium hydrogencarbonate; toluene-4-sulfonic acid; triethylamine; bis-[(trifluoroacetoxy)iodo]benzene; 1,1'-azobis(1-cyanocyclohexanenitrile);
In
tetrahydrofuran; methanol; dichloromethane; water; N,N-dimethyl-formamide; toluene; acetonitrile;
DOI:10.1016/j.tet.2010.12.048