Multi-step reaction with 7 steps
1.1: toluene-4-sulfonic acid / toluene / 18 h / 120 °C / Dean-Stark; Inert atmosphere
2.1: sodium hydride / tetrahydrofuran; mineral oil / 17 h / 40 °C / Schlenk technique; Inert atmosphere; Cooling
2.2: 23 h / 40 °C / Schlenk technique; Inert atmosphere
3.1: tris-(dibenzylideneacetone)dipalladium(0); (R)-4-(tert-butyl)-2-(2-(diphenylphosphino)phenyl)-4,5-dihydrooxazole / tetrahydrofuran / 21 h / 30 °C / Schlenk technique; Inert atmosphere
3.2: 60 °C / Schlenk technique; Inert atmosphere
4.1: pyridinium p-toluenesulfonate / benzene / 3 h / 105 °C / Dean-Stark; Inert atmosphere
5.1: 9-borabicyclo[3.3.1]nonane dimer / tetrahydrofuran / 2.5 h / 0 - 20 °C / Schlenk technique; Inert atmosphere
5.2: 20 h / 0 - 20 °C / Schlenk technique; Inert atmosphere
6.1: sodium hydride / tetrahydrofuran / 0.25 h / 0 °C / Schlenk technique; Inert atmosphere
6.2: 0 - 20 °C / Schlenk technique; Inert atmosphere
7.1: toluene-4-sulfonic acid / water; acetone / 2 h / 50 °C / Schlenk technique; Inert atmosphere
With
tris-(dibenzylideneacetone)dipalladium(0); 9-borabicyclo[3.3.1]nonane dimer; (R)-4-(tert-butyl)-2-(2-(diphenylphosphino)phenyl)-4,5-dihydrooxazole; pyridinium p-toluenesulfonate; sodium hydride; toluene-4-sulfonic acid;
In
tetrahydrofuran; water; acetone; toluene; mineral oil; benzene;
DOI:10.1002/anie.202105384