Diphosgene → 5,5-Dimethyl-3-(3-nitro-4-isopropylphenyl)-1-pyridin-4-ylmethyl-imidazolidine-2,4-dione

Temperature

50 °C

6.04 g (30 mmol) diphosgene in 50 ml 1,2-dichlorethane were treated at −20° C. with a solution of 2 g (11.1 mmol) 3-nitro-4-isopropyl-aniline in 20 ml 1,2-dichlorethane. The mixture was allowed to come to room temperature and then was heated to 50° C. for 5 h. After standing over night, the solvent was evaporated and the residual oil was taken up in 40 ml THF. 3.93 g (18.7 mmol) 2-methyl-2-[(pyridin-4-ylmethyl)-amino]-propionic acid methyl ester in 30 ml THF were added and the mixture was refluxed for 6 h. The solvent was evaporated and the residue taken up in ethylacetate and washed with water. THe organic phase was dried, the solvent evaporated and the residue was purified by preparative HPLC. (C18 reversed phase column, elution with a water (0.1% trifluoracetic acid)/acetonitrile gradient) Yield: 2.7 g.

1. customto come to room temperature
2. waitAfter standing over night
3. customthe solvent was evaporated
4. temperaturethe mixture was refluxed for 6 h
5. customThe solvent was evaporated
6. washwashed with water
7. customTHe organic phase was dried
8. customthe solvent evaporated
9. customthe residue was purified by preparative HPLC
10. washphase column, elution with a water (0.1% trifluoracetic acid)/acetonitrile gradient) Yield: 2.7 g

ORD record

ord-58f96f2b67504f08a9f6457e9921f285

Source dataset

uspto-grants-2010_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07759379B2