Multi-step reaction with 7 steps
1.1: triethylamine / dichloromethane / 0 - 20 °C / Inert atmosphere
2.1: silica gel / diethyl ether; Petroleum ether / Inert atmosphere
3.1: oxalyl dichloride; dimethyl sulfoxide / dichloromethane / 0.5 h / -70 - -50 °C / Inert atmosphere
3.2: -50 - 20 °C / Inert atmosphere
4.1: titanium(IV) isopropylate; titanium tetrachloride / dichloromethane / 3 h / -78 °C / Inert atmosphere
5.1: tetrabutyl ammonium fluoride / tetrahydrofuran / 3 h / 20 °C / Inert atmosphere
5.2: 20 °C / Inert atmosphere
6.1: dmap / dichloromethane / 0 - 20 °C / Inert atmosphere
7.1: bis(2,2,6,6-tetramethylheptane-3,5-dione)cobalt(II); oxygen / 1,2-dichloro-ethane / 2 h / 20 °C
With
titanium(IV) isopropylate; dmap; oxalyl dichloride; bis(2,2,6,6-tetramethylheptane-3,5-dione)cobalt(II); tetrabutyl ammonium fluoride; oxygen; silica gel; titanium tetrachloride; dimethyl sulfoxide; triethylamine;
In
tetrahydrofuran; diethyl ether; dichloromethane; 1,2-dichloro-ethane; Petroleum ether;
3.1: Swern oxidation / 3.2: Swern oxidation / 4.1: Mukaiyama aldol addition;
DOI:10.1021/ol203185f