Multi-step reaction with 14 steps
1: 1.) EtMgBr / 1.) THF, 0 deg C, 1 h, 2.) THF, 25 deg C, 6 days
2: H2 / 20percent Pd(OH)2-C / acetic acid / 24 h / 25 °C / 760 Torr
3: pyridine / 16 h / 25 °C
4: CrO3/H2SO4 / acetone / 0.75 h
5: NaOH / tetrahydrofuran; H2O / 25 °C
6: 68.5 percent / HCl / 15 h / Ambient temperature
7: 82 percent / CrO3, H2SO4 / acetone / 0.67 h / 25 °C
8: 1.) 1-hydroxybenzotriazole, Et3N, 2.) dicyclohexylcarbodiimide / 1.) THF, 0 deg C, 5 min, 2.) THF, from 0 deg C to RT, 20 h
9: 77 percent / Ph3P, diisopropylethylamine, CCl4 / acetonitrile; CH2Cl2 / 2.5 h / Ambient temperature
10: 65 percent / CuBr2, DBU / ethyl acetate; CHCl3 / 22 h
11: 94 percent / H2 / 20percent Pd(OH)2-C / ethyl acetate / 3 h / 760 Torr
12: oxalyl chloride, DMF / CH2Cl2 / 0.67 h / Ambient temperature
13: Et3N / CH2Cl2 / 0.25 h / 0 °C
14: 84 percent / phosphorus pentasulfide, pyridine / CH2Cl2 / 16 h / Heating
With
pyridine; chromium(VI) oxide; hydrogenchloride; tetrachloromethane; diphosphorus pentasulfide; sodium hydroxide; oxalyl dichloride; sulfuric acid; ethylmagnesium bromide; hydrogen; benzotriazol-1-ol; 1,8-diazabicyclo[5.4.0]undec-7-ene; triethylamine; N-ethyl-N,N-diisopropylamine; N,N-dimethyl-formamide; dicyclohexyl-carbodiimide; triphenylphosphine; copper(ll) bromide;
palladium hydroxide - carbon;
In
tetrahydrofuran; dichloromethane; chloroform; water; acetic acid; ethyl acetate; acetone; acetonitrile;
DOI:10.1021/jm00062a013