Multi-step reaction with 9 steps
1: 1.) lithium bis(trimethylsilyl)amide / 1) THF, toluene, 0 deg C, 30 min; 2) THF, toluene, 0 deg C, 2 h
2: 83 percent / aq. HCl / methanol / 2 h / 0 °C
3: 75 percent / 4-(dimethylamino)pyridine / CH2Cl2 / 5 h / Ambient temperature
4: 81 percent / 4-(dimethylamino)pyridine / CH2Cl2 / 15 h / Ambient temperature
5: 76 percent / pyridinium p-toluenesulfonate / ethanol / 15 h / 60 °C
6: 73 percent / pyridinium chlorochromate, sodium acetate, 4 Angstroem molecular sieves / CH2Cl2 / 0.5 h / Ambient temperature
7: 1.) lithium bis(trimethylsilyl)amide / 1) THF, 0 deg C, 35 min, rt, 30 min; 2) THF, 0 deg C, 3 h
8: 61 percent / tetrabutylammonium fluoride / tetrahydrofuran / 2 h / Ambient temperature
9: 43 percent / LiOH / 1,2-dimethoxy-ethane / 2 h / 60 °C
With
hydrogenchloride; dmap; lithium hydroxide; 4 A molecular sieve; tetrabutyl ammonium fluoride; sodium acetate; pyridinium p-toluenesulfonate; pyridinium chlorochromate; lithium hexamethyldisilazane;
In
tetrahydrofuran; methanol; 1,2-dimethoxyethane; ethanol; dichloromethane;
DOI:10.1021/jo951061w