Multi-step reaction with 12 steps
1: lithium diisopropylamide / tetrahydrofuran; hexane / -80 deg C, 15 min, 1h to rt., 2h, rt
2: lithium diisopropylamide / tetrahydrofuran; hexane / 3 h / Ambient temperature
3: 1.) zirconocene dichloride; 2.) n-butyllithium / 1.) CH2Cl2/hexanes, rt., 3 h; 2.) pentane/hexanes, -80 deg C; 3.) THF/Et2O, rt., 18 h
4: triethylamine / CH2Cl2 / 0.67 h / -10 °C
5: LiBr / acetone / 3 h / Heating
6: 85 percent / Mg, dibromoethane, EtMgBr / diethyl ether / 8 h / Heating
7: 98 percent / DMAP, imidazole / CH2Cl2 / 4 h / Ambient temperature
8: tetra-n-butylammonium chloride, ethyl chloroformate, K2CO3 / tetrahydrofuran / 0.33 h / Ambient temperature
9: n-butyllithium / tetrahydrofuran; various solvent(s) / 12 h / -80 °C
10: HgCl2, CaCO3 / acetonitrile; H2O / 4 h / Heating
11: NaBH4 / ethanol / 2 h / Ambient temperature
12: 42 percent / tetra-n-propylammmonium perruthenate, crushed 4 Angstroem molecular sieves, N-methylmorpholine N-oxide / CH2Cl2; acetonitrile / 3 h / Ambient temperature
With
1H-imidazole; dmap; sodium tetrahydroborate; n-butyllithium; tetrapropylammonium perruthennate; 1,1-Dibromoethane; 4 A molecular sieve; zirconocene dichloride; ethylmagnesium bromide; tetrabutyl-ammonium chloride; chloroformic acid ethyl ester; potassium carbonate; magnesium; 4-methylmorpholine N-oxide; triethylamine; calcium carbonate; mercury dichloride; lithium bromide; lithium diisopropyl amide;
In
tetrahydrofuran; diethyl ether; ethanol; hexane; dichloromethane; water; acetone; acetonitrile;
DOI:10.1016/S0040-4020(01)85353-9