Hydrochloric Acid → methyl (1S,2S)-2-(hydroxymethyl)cyclopropane-1-carboxylate

Temperature

0 °C

1.6M n-Butyllithium/hexane solution (76 mL, 120.98 mmol) was added dropwise to a solution of diisopropylamine (12.24 g, 120.98 mmol) in THF (240 mL) at 0° C. over 12 min under argon atmosphere. The mixture was stirred at 0° C. for 30 min, and the reaction mixture was cooled to −78° C. A solution of methyl (S)-3-(oxiran-2-yl)propanoate (13.12 g, 100.81 mmol) in THF (10 mL) was added dropwise thereto at −78° C. over 12 min. The reaction mixture was stirred at −15° C. for 2 hr, and poured into cooled 0.5N hydrochloric acid (600 mL), and the mixture was extracted with ethyl acetate (×3). The organic layer was washed with water and brine, and dried over magnesium sulfate, and the solvent was evaporated under reduced pressure. The obtained residue was purified by silica gel column chromatography (solvent gradient; 49→70% ethyl acetate/hexane) to give methyl (1S,2S)-2-(hydroxymethyl)cyclopropanecarboxylate (2.27 g, 17.44 mmol, 17%) as a colorless oil.

1. temperaturethe reaction mixture was cooled to −78° C
2. waitat −78° C. over 12 min
3. stirringThe reaction mixture was stirred at −15° C. for 2 hr
4. additionpoured
5. extractionthe mixture was extracted with ethyl acetate (×3)
6. washThe organic layer was washed with water and brine
7. dry with materialdried over magnesium sulfate
8. customthe solvent was evaporated under reduced pressure
9. customThe obtained residue was purified by silica gel column chromatography (solvent gradient; 49→70% ethyl acetate/hexane)

ORD record

ord-018abaae74574d8488f344dffea17160

Source dataset

uspto-grants-2016_06

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09365520B2