Multi-step reaction with 7 steps
1.1: potassium carbonate / N,N-dimethyl-formamide / 14 h / 20 °C / Inert atmosphere
2.1: lithium diisopropyl amide / tetrahydrofuran / 0.5 h / -78 °C / Inert atmosphere
2.2: 3 h / -78 - 20 °C / Inert atmosphere
3.1: n-butyllithium / hexane; tetrahydrofuran / 0.42 h / -70 - 20 °C / Inert atmosphere
3.2: 1.25 h / -78 - 20 °C / Inert atmosphere
3.3: 14 h / 0 °C / Inert atmosphere
4.1: triethylamine; sulfur trioxide pyridine complex / dimethyl sulfoxide / 1.25 h / 0 °C / Inert atmosphere
5.1: N-ethyl-N,N-diisopropylamine; tetra-(n-butyl)ammonium iodide / dichloromethane / 20 h / 40 °C / Inert atmosphere
6.1: chloro-trimethyl-silane; triethylamine; potassium hexamethylsilazane / tetrahydrofuran / 0.5 h / -78 - 20 °C / Inert atmosphere
7.1: N-Bromosuccinimide / tetrahydrofuran / 0 °C / Darkness; Inert atmosphere
With
N-Bromosuccinimide; n-butyllithium; chloro-trimethyl-silane; sulfur trioxide pyridine complex; tetra-(n-butyl)ammonium iodide; potassium hexamethylsilazane; potassium carbonate; triethylamine; N-ethyl-N,N-diisopropylamine; lithium diisopropyl amide;
In
tetrahydrofuran; hexane; dichloromethane; dimethyl sulfoxide; N,N-dimethyl-formamide;
DOI:10.1021/ol302691j