反应详情

cis/trans Ethyl 4-{[(1,1-dimethylethyl)(dimethyl)silyl]oxy}cyclohexanecarboxylate (D1, 35 g, 122 mmol) was dissolved in CH3CN (250 mL) and Et3SiH (1.2 eq., 146 mmol, 23 mL), BiBr3 (4% mol, 4.9 mmol, 2.2 g) were added portionwise at room temperature followed by acetaldehyde (1.2 eq., 8.2 mL) that was slowly added at 25° C. The mixture was stirred at room temperature for 1 hour. The mixture was subsequently poured onto an aqueous saturated solution of NaHCO3 and the mixture obtained was then extracted with EtOAc (3×). Organics were combined, washed with brine, dried over Na2SO4, filtered and the solvent was evaporated to afford the crude mixture that was purified by silica chromatography (Biotage 65i column, EtOAc-nhex) to afford the title compound, 21 g, 87%.

1. additionwas slowly added at 25° C
2. customthe mixture obtained
3. extractionwas then extracted with EtOAc (3×)
4. washwashed with brine
5. dry with materialdried over Na2SO4
6. filtrationfiltered
7. customthe solvent was evaporated
8. customto afford the crude mixture that
9. customwas purified by silica chromatography (Biotage 65i column, EtOAc-nhex)