Multi-step reaction with 13 steps
1.1: 2,6-dimethylpyridine / dichloromethane / 0 - 20 °C
2.1: 2,3-dicyano-5,6-dichloro-p-benzoquinone / dichloromethane / 1.17 h / 20 °C / pH 7
3.1: triethylamine; dmap / dichloromethane / 25 h / 0 - 20 °C
4.1: sodium iodide / acetone / 18 h / 50 °C
5.1: 9-methoxy-9-BBN; tert.-butyl lithium / tetrahydrofuran; hexane; diethyl ether; pentane / 4 h / -78 - 20 °C
5.2: 0.33 h / 20 °C
5.3: 13 h / 50 °C
6.1: tetrabutyl ammonium fluoride / tetrahydrofuran / 3 h / 20 °C
7.1: pyridinium p-toluenesulfonate / dichloromethane / 7.5 h / 0 - 20 °C
8.1: acetic acid / tetrahydrofuran; water / 16 h / 20 °C
9.1: pyridinium p-toluenesulfonate / dichloromethane / 2 h / 20 °C
10.1: sodium hydride / N,N-dimethyl-formamide; mineral oil / 0.5 h / 0 - 20 °C
10.2: 12 h / 0 - 20 °C
11.1: diisobutylaluminium hydride / dichloromethane; hexane / 2.25 h / -78 °C
12.1: triethylamine; sulfur trioxide pyridine complex / dichloromethane; dimethyl sulfoxide / 2 h / 0 °C
13.1: triethylamine; di-n-butylboryl trifluoromethanesulfonate / dichloromethane / 1 h / 0 °C
13.2: 2.25 h / -78 - 0 °C
13.3: 1 h / 0 °C
With
2,6-dimethylpyridine; dmap; di-n-butylboryl trifluoromethanesulfonate; tetrabutyl ammonium fluoride; tert.-butyl lithium; sulfur trioxide pyridine complex; pyridinium p-toluenesulfonate; sodium hydride; diisobutylaluminium hydride; acetic acid; triethylamine; 9-methoxy-9-BBN; 2,3-dicyano-5,6-dichloro-p-benzoquinone; sodium iodide;
In
tetrahydrofuran; diethyl ether; hexane; dichloromethane; water; dimethyl sulfoxide; N,N-dimethyl-formamide; acetone; mineral oil; pentane;
13.1: |Evans Aldol Reaction / 13.2: |Evans Aldol Reaction;
DOI:10.1021/ol4017518