Multi-step reaction with 7 steps
1: 46.5 percent / N-methylmorpholine, N,N'-dicyclohexylcarbodiimide / CH2Cl2
2: 1.) H2 / 1.) Pd/C / 1.) 1h; 2.) ethyl acetate/methanol, diethyl ether
3: 1.) m-dimethoxybenzene; 2.) di-tert-butyl dicarbonate, 1N KHCO3 / 1.) trifluoroacetic acid, 0 deg C, 3h; 2.) dioxane
4: 87 percent / N,N-carbonyldiimidazole / tetrahydrofuran / 5 h / 50 °C
5: 88 percent / NaNO2 / acetic acid; H2O / 0 °C
6: 1.)H2; 2.) 1N KHCO3 / 1.) Pd/C / 1.) acetic acid, 5h; 2.) dioxane, room temp.
7: 98 percent / NaCNBH3 / tetrahydrofuran; acetic acid
With
4-methyl-morpholine; di-tert-butyl dicarbonate; hydrogen; sodium cyanoborohydride; potassium hydrogencarbonate; dicyclohexyl-carbodiimide; 1,1'-carbonyldiimidazole; 1,3-Dimethoxybenzene; sodium nitrite;
palladium on activated charcoal;
In
tetrahydrofuran; dichloromethane; water; acetic acid;
DOI:10.1021/jo00164a010