Triethylamine → 7-[3-(R)-[1-(ethylamino)cyclopropyl]pyrrolidin-1-yl]-1-[2-(S)-fluoro-1-(R)-cyclopropyl]-8-methyl-1,4-dihydro-4-oxoquinoline-3-Carboxylic Acid

Temperature

100 °C

After adding 3-(R)-[1-[N-(tert-butoxycarbonyl)-N-(ethyl)amino]cyclopropyl]pyrrolidine (2.16 g, 8.40 mmol) and triethylamine (4 ml) to dried dimethyl sulfoxide (10 ml), 7-fluoro-1-[2-(S)-fluoro-1-(R)-cyclopropyl]-8-methyl-1,4-dihydro-4-oxoquinoline-3-carboxylic acid (1.95 g, 7.00 mmol) was added thereto and heated under reflux in an oil bath of 100° C. for 51 hour under a nitrogen atmosphere. After concentrating the reaction solution under a reduced pressure, the residue was dissolved in chloroform (150 ml). After washing the organic layer with a 10% aqueous citric acid solution (100 ml) and saturated saline solution (100 ml), the organic layer was dried over anhydrous sodium sulfate. After filtering, the filtrate was concentrated under a reduced pressure, and after adding dropwise concentrated hydrochloric acid (10 ml) to the residue while cooling with ice, it was stirred at room temperature for 30 minutes. After adding 1 mol/l hydrochloric acid (20 ml) to the reaction solution and washing the yellow acidic aqueous solution with chloroform (100 ml×5), the pH was adjusted to 12.0 with an aqueous sodium hydroxide solution. After adjusting the pH of the basic aqueous solution to 7.4 with 1 mol/l hydrochloric acid, extraction with chloroform (150 ml×4) was performed. After drying over anhydrous sodium sulfate, the solvent was evapolated under a reduced pressure. The residue thus obtained was purified by recrystallization from ethanol and then dried under a reduced pressure. 1.61 g (55%) of the title compound was thereby obtained in the form of yellow crystals.

1. additionwas added
2. temperatureheated
3. concentrationAfter concentrating the reaction solution under a reduced pressure
4. dissolutionthe residue was dissolved in chloroform (150 ml)
5. washAfter washing the organic layer with a 10% aqueous citric acid solution (100 ml) and saturated saline solution (100 ml)
6. dry with materialthe organic layer was dried over anhydrous sodium sulfate
7. filtrationAfter filtering
8. concentrationthe filtrate was concentrated under a reduced pressure
9. additionafter adding dropwise concentrated hydrochloric acid (10 ml) to the residue
10. temperaturewhile cooling with ice, it
11. additionAfter adding 1 mol/l hydrochloric acid (20 ml) to the reaction solution
12. washwashing the yellow acidic aqueous solution with chloroform (100 ml×5)
13. extractionwith 1 mol/l hydrochloric acid, extraction with chloroform (150 ml×4)
14. dry with materialAfter drying over anhydrous sodium sulfate
15. customThe residue thus obtained
16. customwas purified by recrystallization from ethanol
17. customdried under a reduced pressure

ORD record

ord-b525148165624accb1f30791ff190e06

Source dataset

uspto-grants-2011_03

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07902226B2