反应详情

Triethylsilane (10 mL, 63 mmol) was added to a solution of ethyl 4-{[(1,1-dimethylethyl)(dimethyl)silyl]oxy}cyclohexanecarboxylate (D1, 13.6 g, 47.4 mmol), bismuth tribromide (923 mg, 2.06 mmol) and cyclopropanecarbaldehyde (4.25 mL, 56.8 mmol) in acetonitrile (60 mL) at rt under Ar. A black precipitate and an exotherm occurred on the addition of the triethylsilane. The mixture was stirred for 1 h before being poured on to sat. NaHCO3 (200 mL). The reaction was extracted with EtOAc (2×) and the combined organics were washed (sat. NaCl), dried (Na2SO4) and concentrated by rotary evaporation to give a mixture of cis and trans ethyl 4-[(cyclopropylmethyl)oxy]cyclohexanecarboxylate (D42, 20.8 g, 97%, contained silyl residues) as a colourless oil.

1. extractionThe reaction was extracted with EtOAc (2×)
2. washthe combined organics were washed (sat. NaCl)
3. dry with materialdried (Na2SO4)
4. concentrationconcentrated by rotary evaporation
5. customto give