反应详情

To a solution of tert-butyl 3-(5-(3-fluorophenyl)-2-phenyl-2,3-dihydro-1,3,4-thiadiazol-2-yl)butylcarbamate (50 mg, 116 mmol) in anhydrous DCM (5 mL) was added isobutyryl chloride (16 pt, 151 mmol) followed by triethylamine (21 μL, 151 mmol). After stirring at room temperature for 16 hours the mixture was partitioned between sat. NaHCO3 (20 mL) and DCM (20 mL). The aqueous layer was extracted with DCM (10 mL) and the combined organic phases were washed with brine (20 mL), dried over Na2SO4 and concentrated under reduced pressure. The residue was chromatographed (19:1, hexanes/ethyl acetate) to afford two diastereomeric pairs, diastereomer pair A (more polar, 13.1 mg) and diastereomer pair B (less polar, 11 mg).

1. customwas partitioned between sat. NaHCO3 (20 mL) and DCM (20 mL)
2. extractionThe aqueous layer was extracted with DCM (10 mL)
3. washthe combined organic phases were washed with brine (20 mL)
4. dry with materialdried over Na2SO4
5. concentrationconcentrated under reduced pressure
6. customThe residue was chromatographed (19:1, hexanes/ethyl acetate)
7. customto afford two diastereomeric pairs, diastereomer pair A (more polar, 13.1 mg) and diastereomer pair B (less polar, 11 mg)