Diisopropylethylamine → [3,4-Bis(Fluoranyl)-2-[(2-Fluoranyl-4-Iodanyl-Phenyl)amino]phenyl]-(3-Oxidanylazetidin-1-Yl)methanone

3,4-Difluoro-2-[(2-fluoro-4-iodophenyl)amino]benzoic acid (2.1 g, 5.3 mmol), prepared using procedures similar to those in U.S. Pat. No. 7,019,033, was taken into DMF (10 mL) followed by addition of PyBOP (2.6 g, 5.3 mmol) and the mixture was allowed to stir at room temperature over 15 minutes. Azetidin-3-ol hydrochloride (870 mg, 8.0 mmol) and DIPEA (1.85 mL, 11.2 mmol) was then added and the mixture was allowed to stir an additional hour at room temperature. The mixture was then partitioned with ethyl acetate and 0.5 M aqueous sodium hydroxide solution. The organic layer was then washed with water (3×) then brine and dried over anhydrous sodium sulfate. Filtration and concentration followed by silica gel flash chromatography using ethyl acetate: hexanes (5:1) eluent afforded 1-({3,4-difluoro-2-[(2-fluoro-4-iodophenyl)amino]phenyl}carbonyl)azetidin-3-ol (2.09 g, 87% yield) as a colorless amorphous solid. 1H NMR (400 MHz, CDCl3): 8.47 (s, 1H), 7.39 (dd, 1H), 7.32 (d, 1H), 7.13-7.09 (m, 1H), 6.84-6.78 (m, 1H), 6.63-6.57 (m, 1H), 4.74-4.67 (m, 1H), 4.43-4.39 (m, 2H), 4.20-3.96 (br d, 2H), 2.50 (d, 1H).

1. stirringto stir an additional hour at room temperature
2. customThe mixture was then partitioned with ethyl acetate and 0.5 M aqueous sodium hydroxide solution
3. washThe organic layer was then washed with water (3×)
4. dry with materialbrine and dried over anhydrous sodium sulfate
5. filtrationFiltration and concentration

ORD record

ord-f948650b13e441de8b37709b4d90426e

Source dataset

uspto-grants-2011_03

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07915250B2