Multi-step reaction with 3 steps
1.1: tetrahydrofuran / 3 h / 0 °C / Inert atmosphere
2.1: 2,4,6-tripropyl-1,3,5,2,4,6-trioxatriphosphinane-2,4,6-trioxide; N-ethyl-N,N-diisopropylamine / toluene; ethyl acetate / 4 h / 20 °C / Inert atmosphere
3.1: lithium hexamethyldisilazane / tetrahydrofuran / 0.17 h / -78 - 20 °C / Inert atmosphere
3.2: 1 h / 20 °C / Inert atmosphere
With
2,4,6-tripropyl-1,3,5,2,4,6-trioxatriphosphinane-2,4,6-trioxide; N-ethyl-N,N-diisopropylamine; lithium hexamethyldisilazane;
In
tetrahydrofuran; ethyl acetate; toluene;
DOI:10.1021/ol501092m