Multi-step reaction with 9 steps
1: 100 percent / K2CO3 / ethanol / 1 h / Heating
2: 100 percent / K2CO3, Bu4NI / dimethylformamide / 11 h / 25 °C
3: 96 percent / dimethylformamide / 20 h / Heating
4: 100 percent / LiOH / tetrahydrofuran; methanol; H2O / 25 h / 25 °C
5: 87 percent / Et3N, diphenyl phosphorazidate / 14 h / Heating
6: 87 percent / NBS, H2SO4 / tetrahydrofuran / 4 h / -60 °C
7: 1) NaH / 1) DMF, 25 deg C, 30 min, 2) DMF, 0 deg C, 1 h; 25 deg C, overnight
8: 1) O3/O2, 2) dimethyl sulfide / 1) CH3OH, CH2Cl2, -78 deg C, 72 s, 2) CH3OH, CH2Cl2, -78 deg C -> 25 deg C; 25 deg C, 5 h
9: 1) n-BuLi, 2) HMPA / 1) THF, hexane, -78 deg C, 10 min; -78 deg C -> 0 deg C, 20 min, 2) THF, -78 deg C, 1.5 h; 25 deg C, 24 h
With
N,N,N,N,N,N-hexamethylphosphoric triamide; lithium hydroxide; N-Bromosuccinimide; n-butyllithium; dimethylsulfide; sulfuric acid; diphenyl phosphoryl azide; oxygen; tetra-(n-butyl)ammonium iodide; sodium hydride; potassium carbonate; ozone; triethylamine;
In
tetrahydrofuran; methanol; ethanol; water; N,N-dimethyl-formamide;
DOI:10.1021/jo9605298