Multi-step reaction with 8 steps
1: 92 percent / imidazole / CH2Cl2 / 1 h / 0 °C
2: 98 percent / Dess-Martin periodinane / CH2Cl2 / 0.5 h
3: 89 percent / NaH, tetra-n-butylammonium iodide / dimethylformamide / 4 h / Ambient temperature
4: 43 percent / TiCl4 / CH2Cl2 / -78 °C
5: 1) Dess-Martin periodinane, 2) NaBH4 / 1) CH2Cl2, 0 deg C, 30 min, 2) methanol, -40 deg C, 1 h
6: 1) potassium hexamethyldisilazide, 2) N-(5-chloro-2-pyridyl)triflimide / 1) THF, toluene, -78 deg C, 15 min
8: 83 percent / diisopropylethylamine / CH2Cl2 / 5 h / Ambient temperature
With
1H-imidazole; sodium tetrahydroborate; titanium tetrachloride; tetra-(n-butyl)ammonium iodide; potassium hexamethylsilazane; sodium hydride; Dess-Martin periodane; N-(5-chloropyridin-2-yl)-1,1,1-trifluoro-N-[(trifluoromethyl)sulphonyl]methanesulphonamide; N-ethyl-N,N-diisopropylamine;
In
dichloromethane; N,N-dimethyl-formamide;
DOI:10.1021/jo982002w