Multi-step reaction with 5 steps
1.1: potassium hydroxide / N,N-dimethyl-formamide / 0.17 h / 20 °C / Inert atmosphere
1.2: 0.5 h / 20 °C / Inert atmosphere
2.1: sodium hydride / N,N-dimethyl-formamide; mineral oil / 0.5 h / 0 - 20 °C / Inert atmosphere
2.2: 20 °C / Inert atmosphere
3.1: n-butyllithium / tetrahydrofuran; hexane / 1 h / -78 °C / Inert atmosphere
3.2: 2 h / -78 °C / Inert atmosphere
4.1: tetrabutyl ammonium fluoride / tetrahydrofuran / 1 h / 20 °C / Inert atmosphere
5.1: N,N,N,N,-tetramethylethylenediamine; sec.-butyllithium / tetrahydrofuran; cyclohexane / 0.67 h / -78 - -40 °C / Inert atmosphere
5.2: 1 h / -78 °C / Inert atmosphere
5.3: 20 °C / Inert atmosphere
With
n-butyllithium; N,N,N,N,-tetramethylethylenediamine; tetrabutyl ammonium fluoride; sec.-butyllithium; sodium hydride; potassium hydroxide;
In
tetrahydrofuran; hexane; cyclohexane; N,N-dimethyl-formamide; mineral oil;
DOI:10.1002/anie.201108016