Multi-step reaction with 5 steps
1.1: sodium hydroxide / toluene / 1 h
2.1: toluene-4-sulfonic acid / toluene / 16 h / Reflux; Water separator
3.1: sodium hydride / N,N-dimethyl-formamide; mineral oil / 0.33 h / 0 °C
3.2: 12 h / 20 °C
4.1: sodium hydroxide; methanol / 3 h / 20 °C
4.2: pH 2
5.1: triethylamine; 2,4,6-tripropyl-1,3,5,2,4,6-trioxatriphosphinane-2,4,6-trioxide / ethyl acetate; tetrahydrofuran / 0.75 h / 0 °C / Inert atmosphere
5.2: 2.5 h / 20 °C
With
methanol; sodium hydride; 2,4,6-tripropyl-1,3,5,2,4,6-trioxatriphosphinane-2,4,6-trioxide; triethylamine; sodium hydroxide;
toluene-4-sulfonic acid;
In
tetrahydrofuran; ethyl acetate; N,N-dimethyl-formamide; toluene; mineral oil;