Multi-step reaction with 4 steps
1: N-ethyl-N,N-diisopropylamine / dichloromethane / -30 - 20 °C
2: N-ethyl-N,N-diisopropylamine / dimethyl sulfoxide / 20 °C / Inert atmosphere
3: trifluoroacetic acid / dichloromethane / 2.5 h / 60 °C
4: 2,4,6-tripropyl-1,3,5,2,4,6-trioxatriphosphinane-2,4,6-trioxide; triethylamine / dichloromethane; ethyl acetate / 2 h
With
2,4,6-tripropyl-1,3,5,2,4,6-trioxatriphosphinane-2,4,6-trioxide; triethylamine; N-ethyl-N,N-diisopropylamine; trifluoroacetic acid;
In
dichloromethane; dimethyl sulfoxide; ethyl acetate;