Multi-step reaction with 11 steps
1: HCl / ethyl acetate / 1 h
2: 72 percent / bis(2-oxo-3-oxazolidinyl)phosphinic chloride; triethylamine / CH2Cl2 / 15 h / 4 °C
3: 100 percent / n-Bu4NF / tetrahydrofuran / 1 h / 0 °C
4: HCl / dioxane / 0.5 h
5: 60 percent / diethyl phosphorocyanidate; triethylamine / dimethylformamide / 19 h / 0 - 20 °C
6: LiOH / tetrahydrofuran; H2O / 2 h / 0 - 20 °C
7: 77 percent / diethyl phosphorocyanidate; triethylamine / dimethylformamide / 15 h / 0 - 20 °C
8: 75 percent / imidazole / dimethylformamide / 13 h / 0 - 20 °C
9: morpholine / (PPh3)4Pd / tetrahydrofuran / 2 h
10: HCl / dioxane / 1.5 h / 0 °C
11: 84 percent / pentafluorophenyl diphenylphosphinate; N,N-diisopropylethylamine / CH2Cl2 / 17 h / 20 °C
With
morpholine; 1H-imidazole; hydrogenchloride; lithium hydroxide; diethyl cyanophosphonate; pentafluorophenyl diphenyl-phosphinate; tetrabutyl ammonium fluoride; bis-(2-oxo-3-oxazolidinyl)phosphoryl chloride; triethylamine; N-ethyl-N,N-diisopropylamine;
tetrakis(triphenylphosphine) palladium(0);
In
tetrahydrofuran; 1,4-dioxane; dichloromethane; water; ethyl acetate; N,N-dimethyl-formamide;
DOI:10.1016/j.tet.2004.12.009