Multi-step reaction with 7 steps
1: 1.) CuI / 1.) THF, 0 deg C, 30 min, 2.) THF, 0 deg C, 30 min
2: NaH, imidazole / tetrahydrofuran / 0.5 h / 0 °C
3: NaN3, n-tetrabutylammonium iodide / 1,2-dimethoxy-ethane; 2-methoxy-ethanol; H2O / 72 h / 120 °C
4: 1.) NaH, imidazole, 2.) n-tetrabutylammonium iodide / 1.) THF, DMF, 0 deg C, 2.) r.t., 4 h
5: H2 / Lindlar catalyst / ethanol / 24 h / 760 Torr / Ambient temperature
6: 1.) pyridine, 2.) Ac2O / 1.) 90 deg C, 1 h, 2.) 90 deg C, 2 h
7: 87 percent / BF3*Et2O / 0.08 h / Ambient temperature
With
pyridine; 1H-imidazole; copper(l) iodide; sodium azide; boron trifluoride diethyl etherate; hydrogen; acetic anhydride; tetra-(n-butyl)ammonium iodide; sodium hydride;
Lindlar's catalyst;
In
tetrahydrofuran; 1,2-dimethoxyethane; ethanol; 2-methoxy-ethanol; water;
DOI:10.1021/jo00112a040