Triethylamine → Methyl 3-formylcyclohexane-1-carboxylate

To a cold (−78° C.) solution of 3-(methoxycarbonyl)cyclohexanecarboxylic acid (1.25 g, 6.71 mmol) in THF (20 mL) was added BH3.Me2S (0.7 mL, 7.38 mmol). The resulting mixture was stirred at −78° C. to room temperature overnight. The reaction mixture was quenched with a saturated aqueous NH4Cl solution and extracted with ethyl acetate. The organic phase was washed with brine, dried over Na2SO4, and evaporated. The residue was purified by column chromatography on silica gel (n-hexane/ethyl acetate=2/1) to give methyl 3-(hydroxymethyl)cyclo-hexanecarboxylate as a colorless oil (845 mg, yield; 73%). To a solution of methyl 3-(hydroxymethyl)cyclohexanecarboxylate (840 mg, 4.88 mmol) in Et3N (4.4 mL, 32 mmol) and DMSO (10 mL) was added sulfur trioxide-pyridine complex (2.56 g, 16.1 mmol). The mixture was stirred at room temperature for 1 hr. The reaction mixture was partitioned between ethyl acetate and water. The organic phase was washed with brine, dried over Na2SO4, filtered and evaporated. The residue was purified by column chromatography on silica gel (n-hexane/ethyl acetate=2/1) to give methyl 3-formylcyclohexanecarboxylate as a pale yellow oil (795 mg, yield; 96%).

1. customThe reaction mixture was partitioned between ethyl acetate and water
2. washThe organic phase was washed with brine
3. dry with materialdried over Na2SO4
4. filtrationfiltered
5. customevaporated
6. customThe residue was purified by column chromatography on silica gel (n-hexane/ethyl acetate=2/1)

ORD record

ord-5c671f7759a54dc2b193b58d82c4b1d1

Source dataset

uspto-grants-2003_05

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06562811B1