Sodium hydride → 3-Bromo-1-methoxypyrrolidin-2-one

130 g of the above-obtained oil containing N-methoxy-2,4-dibromobutyric acid amide were dissolved in 500 mL of benzene. To the resultant solution, 12 g of sodium hydride were gradually added while cooling the solution to 15° C. to 20° C. After the completion of the addition, ice was added to the resultant reaction solution to decompose excessive sodium hydride. The resultant solution was washed with a saturated saline, followed by drying the solution by magnesium sulfate. The solution was concentrated under a reduced pressure and purified by silica gel-acetone/benzene column chromatography. Consequently, 39 g (0.2 mol) of N-methoxy-2-bromo-4-butyrolactam (with a yield of 36% from 2,4-dibromobutyric acid bromide) was obtained.

1. temperaturewhile cooling the solution to 15° C. to 20° C
2. additionAfter the completion of the addition, ice
3. additionwas added to the resultant
4. customreaction solution
5. washThe resultant solution was washed with a saturated saline
6. dry with materialby drying the solution by magnesium sulfate
7. concentrationThe solution was concentrated under a reduced pressure
8. custompurified by silica gel-acetone/benzene column chromatography

ORD record

ord-027be8abb3c94a05ae4bed79916e3d2c

Source dataset

uspto-grants-2011_03

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07902383B2