Ethyl Propionate → HCID 89525434, compound

Temperature

-78 °C

N,N-diisopropylamine (78 g, 770 mmol) was dissolved in anhydrous THF (200 mL) and cooled to −78° C. under nitrogen. Butyl lithium (2.5M solution in hexane, 297 mL, 743 mmol) was added drop-wise. The reaction was removed from the cooling bath for 30 minutes, then re-cooled to −78° C. A solution of ethyl propionate (72.8 g, 713 mmol) in anhydrous THF (200 mL) was added drop-wise and the reaction allowed to stir at room temperature for 1 hour. The reaction was cooled to −78° C. once again and a solution of 2-methyl-N-oxetan-3-ylidenepropane-2-sulfinamide (Preparation 39, 50 g, 285 mmol) in anhydrous THF (200 mL) was added drop-wise. The reaction was stirred at between −40° C. and −60° C. for 4 hours before being quenched with a saturated aqueous solution of ammonium chloride and extracted with ethyl acetate. The organic layer was dried over MgSO4 and concentrated in vacuo. Purification by silica gel column chromatography (ethyl acetate elution) was not successful. The title compound was obtained as a yellow oil (40 g, 51% yield) and used without further purification.

1. customThe reaction was removed from the cooling bath for 30 minutes
2. temperaturere-cooled to −78° C
3. temperatureThe reaction was cooled to −78° C. once again
4. stirringThe reaction was stirred at between −40° C. and −60° C. for 4 hours
5. custombefore being quenched with a saturated aqueous solution of ammonium chloride
6. extractionextracted with ethyl acetate
7. dry with materialThe organic layer was dried over MgSO4
8. concentrationconcentrated in vacuo
9. customPurification
10. washby silica gel column chromatography (ethyl acetate elution)

ORD record

ord-5c2d0e818eaa4784be0266c76224a501

Source dataset

uspto-grants-2015_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09079878B2