反应详情

To a solution of thiazole (0.309 mL, 4.36 mmol) in tetrahydrofuran (5 mL) was added a solution of isopropylmagnesium chloride lithium chloride complex (1.0 M in tetrahydrofuran, 3.36 mL, 4.36 mmol). After 20 minutes, the resulting solution was added to a solution of methyl 4-acetyl-1-methylcyclohexanecarboxylate (864.9 mg, 4.36 mmol) in tetrahydrofuran (10 mL) via syringe over 6 minutes. After 90 minutes, saturated aqueous ammonium chloride solution (5 mL) was added to the reaction mixture and the resulting suspension was partitioned between water (5 mL) and ethyl acetate (30 mL). The organic layer was washed with saturated aqueous sodium bicarbonate solution and brine, dried over sodium sulfate, filtered, and concentrated under reduced pressure. The residue was purified by chiral chromatography (methanol/supercritical CO2) to give four separate stereoisomers (peak 1, peak 2, peak 3, peak 4) of methyl 4-[1-hydroxy-1-(1,3-thiazol-2-yl)ethyl]-1-methylcyclohexanecarboxylate. MS ESI calc'd. for C14H21NO3S [M+H]+ 284. found 284.

1. waitAfter 90 minutes
2. customthe resulting suspension was partitioned between water (5 mL) and ethyl acetate (30 mL)
3. washThe organic layer was washed with saturated aqueous sodium bicarbonate solution and brine
4. dry with materialdried over sodium sulfate
5. filtrationfiltered
6. concentrationconcentrated under reduced pressure
7. customThe residue was purified by chiral chromatography (methanol/supercritical CO2)
8. customto give four
9. customseparate stereoisomers (peak 1, peak 2, peak 3, peak 4) of methyl 4-[1-hydroxy-1-(1,3-thiazol-2-yl)ethyl]-1-methylcyclohexanecarboxylate