Multi-step reaction with 8 steps
1.1: bromine / diethyl ether / 3 h / -78 °C
1.2: 1 h / -78 - 20 °C
2.1: hydroquinone / 3.5 h / pH 6.3 / aq. phosphate buffer; Reflux
3.1: 1H-imidazole; dmap / N,N-dimethyl-formamide / 0.17 h / Inert atmosphere
3.2: 0 - 20 °C / Inert atmosphere
4.1: dmap; triethylamine / dichloromethane / 24 h / Inert atmosphere; Reflux
5.1: tert.-butyl lithium / diethyl ether; pentane / 2 h / -78 - 20 °C / Inert atmosphere
5.2: 3.33 h / -78 °C / Inert atmosphere
6.1: 2,6-dimethylpyridine / N,N-dimethyl-formamide / 2.33 h / 0 - 20 °C / Inert atmosphere
7.1: 7,7',8,8'-tetracyanoquinodimethane / tetrahydrofuran; water / 24 h / 20 °C
8.1: sodium hydrogencarbonate / dichloromethane / 0.17 h / 20 °C
8.2: 2.5 h / 20 °C
With
1H-imidazole; 2,6-dimethylpyridine; dmap; bromine; tert.-butyl lithium; sodium hydrogencarbonate; triethylamine; hydroquinone; 7,7',8,8'-tetracyanoquinodimethane;
In
tetrahydrofuran; diethyl ether; dichloromethane; water; N,N-dimethyl-formamide; pentane;
DOI:10.1021/ol301513h