Multi-step reaction with 7 steps
1: 1,2-dichloro-ethane / 16 h / 45 °C
2: boron tribromide / dichloromethane; tetrahydrofuran / 16 h / 0 - 20 °C
3: N-ethyl-N,N-diisopropylamine; HATU; 1-hydroxy-7-aza-benzotriazole / N,N-dimethyl-formamide; tetrahydrofuran / 1.5 h / 0 - 20 °C
4: toluene / 1.5 h / Reflux
5: tetrakis(triphenylphosphine) palladium(0); 1,3-dimethylbarbituric acid / dichloromethane; ethyl acetate / 1 h / 20 °C
6: N-ethyl-N,N-diisopropylamine; 2,4,6-tripropyl-1,3,5,2,4,6-trioxatriphosphinane-2,4,6-trioxide / dichloromethane; ethyl acetate / 2 h
7: trifluoroacetic acid / dichloromethane / 1.5 h / 0 °C
With
tetrakis(triphenylphosphine) palladium(0); 1-hydroxy-7-aza-benzotriazole; 1,3-dimethylbarbituric acid; boron tribromide; 2,4,6-tripropyl-1,3,5,2,4,6-trioxatriphosphinane-2,4,6-trioxide; N-ethyl-N,N-diisopropylamine; HATU; trifluoroacetic acid;
In
tetrahydrofuran; dichloromethane; ethyl acetate; 1,2-dichloro-ethane; N,N-dimethyl-formamide; toluene;