Hydrochloric Acid → Methyl 2-(1-[(methanesulfonyloxy)-methyl]cyclopropyl)acetate

Temperature

-60 °C

To a stirred solution of (1-hydroxymethyl-cyclopropyl)-acetic acid methyl ester (600 mg, 4.16 mmol) in dichloromethane (10 mL) cooled in dry ice-acetone bath (−40° C.), was added methanesulfonyl chloride (483 μL, 6.24 mmol). The mixture was then cooled to −60° C. and triethylamine (928 μA, 6.66 mmol) was added. With stirring, the mixture was warmed up to 0° C. during 1 hr. After cooling the mixture to −15° C., cold 3 N HCl solution (0.6 mL), cold brine (2 mL), and dichloromethane (25 mL) were added in this order. The mixture was washed with cold brine (25 mL) twice, dried with MgSO4, filtered, and evaporated in vacuo to give 962 mg (quantitative) of crude (1-methanesulfonyloxymethyl-cyclopropyl)-acetic acid methyl ester as a colorless oil. This crude product was used directly in the next reaction without further purification. 1H-NMR (200 MHz, CDCl3) δ 0.62-0.72 (4H, m), 2.42 (2H, s), 3.02 (3H, s), 3.70 (3H, s), 4.17 (2H, s).

1. temperaturethe mixture was warmed up to 0° C. during 1 hr
2. temperatureAfter cooling the mixture to −15° C.
3. washThe mixture was washed with cold brine (25 mL) twice
4. dry with materialdried with MgSO4
5. filtrationfiltered
6. customevaporated in vacuo

ORD record

ord-8957771ac7614eaa95650ec75b2c44a2

Source dataset

uspto-grants-2012_12

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08334295B2