Multi-step reaction with 7 steps
1.1: LDA / tetrahydrofuran / 1 h / -65 - -60 °C
1.2: 44 percent / 1,3-dimethylimidazolidin-2-one / tetrahydrofuran / 4 h / -65 °C
2.1: 88 percent / AlCl3 / 1,2-dichloro-ethane / 5 h / 15 - 25 °C
3.1: 73 percent / NaIO4; RuCl3*H2O / acetonitrile; ethyl acetate; H2O / 4 h / 20 °C
4.1: 100 percent / tetrahydrofuran; diethyl ether / 0 - 20 °C
5.1: 93 percent / Lawesson reagent / toluene / 0.5 h / 130 °C
6.1: COCl2 / toluene; dimethylformamide; CH2Cl2 / 0 °C
6.2: DABCO / tetrahydrofuran / 0.42 h / 20 °C
6.3: 90 percent / NaN3 / dimethylformamide / 72 h / 20 °C
7.1: 96 percent / CH2Cl2 / 24 h / 20 °C
With
Lawessons reagent; ruthenium trichloride; sodium periodate; aluminium trichloride; lithium diisopropyl amide;
In
tetrahydrofuran; diethyl ether; dichloromethane; water; ethyl acetate; 1,2-dichloro-ethane; N,N-dimethyl-formamide; toluene; acetonitrile;
DOI:10.1002/hlca.200490226