Multi-step reaction with 12 steps
1.1: magnesium / tetrahydrofuran / Inert atmosphere
1.2: 16 h / -10 - 20 °C / Inert atmosphere
2.1: magnesium / tetrahydrofuran / 1 h / 0 - 20 °C / Inert atmosphere
2.2: 18 h / 0 - 4 °C / Inert atmosphere
3.1: tert.-butyl lithium / diethyl ether; pentane / 0.5 h / -78 °C / Inert atmosphere
3.2: 0.17 h / -25 °C / Inert atmosphere
4.1: triethylamine / dichloromethane / 0 - 20 °C / Inert atmosphere
5.1: silica gel / diethyl ether; Petroleum ether / Inert atmosphere
6.1: oxalyl dichloride; dimethyl sulfoxide / dichloromethane / 0.5 h / -70 - -50 °C / Inert atmosphere
6.2: -50 - 20 °C / Inert atmosphere
7.1: titanium(IV) isopropylate; titanium tetrachloride / dichloromethane / 3 h / -78 °C / Inert atmosphere
8.1: tetrabutyl ammonium fluoride / tetrahydrofuran / 3 h / 20 °C / Inert atmosphere
8.2: 20 °C / Inert atmosphere
9.1: dmap / dichloromethane / 0 - 20 °C / Inert atmosphere
10.1: bis(2,2,6,6-tetramethylheptane-3,5-dione)cobalt(II); oxygen / 1,2-dichloro-ethane / 2 h / 20 °C
11.1: 1,8-diazabicyclo[5.4.0]undec-7-ene / tetrahydrofuran / 3 h / 0 °C
11.2: 3 h / 0 °C / Inert atmosphere
12.1: acetic acid; zinc / diethyl ether / 20 h / 20 °C / Inert atmosphere
With
titanium(IV) isopropylate; dmap; oxalyl dichloride; bis(2,2,6,6-tetramethylheptane-3,5-dione)cobalt(II); tetrabutyl ammonium fluoride; tert.-butyl lithium; oxygen; silica gel; titanium tetrachloride; magnesium; acetic acid; dimethyl sulfoxide; 1,8-diazabicyclo[5.4.0]undec-7-ene; triethylamine; zinc;
In
tetrahydrofuran; diethyl ether; dichloromethane; 1,2-dichloro-ethane; Petroleum ether; pentane;
6.1: Swern oxidation / 6.2: Swern oxidation / 7.1: Mukaiyama aldol addition;
DOI:10.1021/ol203185f