Multi-step reaction with 11 steps
1.1: ozone / methanol / -78 °C
2.1: sodium tetrahydroborate / methanol / -78 - 20 °C
3.1: pyridinium p-toluenesulfonate / dichloromethane / 18 h / 20 °C
4.1: magnesium / diethyl ether / 2 h / Reflux
4.2: -5 - 0 °C
5.1: bromine; triphenylphosphine / dichloromethane / 0 - 20 °C
6.1: magnesium / tetrahydrofuran / 50 °C
6.2: 0 °C
7.1: dibromotriphenylphosphorane / dichloromethane / 0 - 20 °C
8.1: potassium hydride / toluene; paraffin oil / 18 h / 20 °C / Inert atmosphere
8.2: 10 h / Inert atmosphere; Reflux
9.1: pyridinium p-toluenesulfonate / methanol / 10 h / Reflux
10.1: pyridine / chloroform / 16 h / 20 °C
11.1: potassium hydride / toluene; paraffin oil / 19 h / 20 - 100 °C / Inert atmosphere
11.2: 10 h / Inert atmosphere; Reflux
With
pyridine; sodium tetrahydroborate; bromine; pyridinium p-toluenesulfonate; potassium hydride; ozone; magnesium; triphenylphosphine; dibromotriphenylphosphorane;
In
tetrahydrofuran; methanol; diethyl ether; dichloromethane; chloroform; toluene; paraffin oil;
DOI:10.1002/ejoc.201100758