Multi-step reaction with 6 steps
1.1: potassium carbonate / acetic acid butyl ester; water / 1.5 h / 80 °C
2.1: tetrabutyl ammonium fluoride / tetrahydrofuran / 1 h / 60 °C
3.1: caesium carbonate / N,N-dimethyl-formamide / 2 h / 80 °C
4.1: lithium hydroxide; water / tetrahydrofuran / 4 h / 20 °C
4.2: pH 1
5.1: 2,4,6-tripropyl-1,3,5,2,4,6-trioxatriphosphinane-2,4,6-trioxide / N,N-dimethyl-formamide / 12 h / 100 °C
6.1: 2,6-dimethylpyridine / dichloromethane / 2 h / Cooling with ice
With
2,6-dimethylpyridine; tetrabutyl ammonium fluoride; water; potassium carbonate; caesium carbonate; 2,4,6-tripropyl-1,3,5,2,4,6-trioxatriphosphinane-2,4,6-trioxide; lithium hydroxide;
In
tetrahydrofuran; dichloromethane; acetic acid butyl ester; water; N,N-dimethyl-formamide;