Hydrochloric Acid → (4-Methanesulfonylamino-butoxy)-acetic Acid Ethyl Ester

Temperature

100 °C

To a mixture of NaH (60% in oil, 167 mg, 4.18 mmol) and DMF (10 mL) was added a solution of methanesulfonamide (398 mg, 4.18 mmol) in DMF (5 mL). The mixture was heated at 100° C. for 1.5 h and was cooled to room temperature. A solution of (4-bromo-butoxy)-acetic acid ethyl ester (1.000 g, 4.182 mmol) in DMF (10 mL) was added and the reaction was heated at 100° C. for 21 h. Water was added to the cooled reaction mixture and the aqueous solution was acidified to pH=2 with concentrated HCl. The aqueous solution was extracted with EtOAc (4×) and the organic solution was dried (MgSO4), filtered, and concentrated. The product was purified by flash chromatography (60% EtOAc/hexanes) to afford the title compound (181 mg). 1H NMR (400 MHz, CDCl3) δ 4.90 (m, 1H), 4.20 (q, 2H), 4.04 (s, 2H), 3.54 (m, 2H), 3.16 (m, 2H), 2.93 (s, 2H), 1.69 (m, 4H), 1.26 (t, 3H); MS 254.1 (M+1).

1. temperaturewas cooled to room temperature
2. temperaturethe reaction was heated at 100° C. for 21 h
3. extractionThe aqueous solution was extracted with EtOAc (4×)
4. dry with materialthe organic solution was dried (MgSO4)
5. filtrationfiltered
6. concentrationconcentrated
7. customThe product was purified by flash chromatography (60% EtOAc/hexanes)

ORD record

ord-1670d15f0b7846fb955ee679a90b0ab3

Source dataset

uspto-grants-2003_11

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06649657B2