1,4-Dibromobenzene → HCID 68700072, compound

Temperature

-78 °C

A solution of 1,4-dibromobenzene (0.223 g, 0.944 mmol) in anhydrous THF (3.0 ml) was cooled to −78° C. To the cooled solution, n-butyllithium (1.6 M in hexanes, 0.47 ml, 0.746 mmol) was added dropwise, and the reaction stirred at −78° C. for 45 minutes. A solution of the 3,4,5,6-tetrahydro-2H-[1,2′]bipyridinyl-4-carboxylic acid methoxy-methyl-amide (0.124 g, 0.497 mmol) in anhydrous THF (3.0 ml) was then added dropwise to the reaction. The reaction stirred at −78° C. for 3 hours and at 0° C. until complete. The reaction was quenched at 0° C. by the addition of 1 N HCl (5 ml) and saturated NaHCO3 (7.5 ml). The mixture was extracted with ethyl acetate, washed with brine, dried over MgSO4, filtered, and concentrated. The crude product was purified by silica gel chromatography using 3-10% acetone in hexanes, yielding the product (0.1220 g, 71%) as a colorless oi: 1H NMR (400 MHz, CDCl3) δ 8.16 (dd, J=4.9, 1.2 Hz, 1H), 7.81 (m, 2H), 7.61 (m, 2H), 7.46 (m, 1H), 6.67 (d, J=8.7 Hz, 1H), 6.59 (dd, J=6.7, 5.1 Hz, 1H). 4.33 (dt, J=13.1, 3.1 Hz, 2H), 3.42 (m, 1H), 3.14 (m, 2H), 1.93 (d, J=13.2, 2.2 Hz, 2H), 1.82 (m, 2H); 13C NMR (100 MHz, CDCl3) 201.20, 159.20, 147.87, 137.53, 134.57, 132.28, 129.80, 128.20, 113.09, 107.34, 45.01, 43.76, 28.01; m/z calcd. for C17H17BrN2O: 344.05 found: (M+H)+347.1; HPLC retention time=3.205 min (wavelength 254 nm), purity=100%.

1. stirringThe reaction stirred at −78° C. for 3 hours and at 0° C. until complete
2. customThe reaction was quenched at 0° C. by the addition of 1 N HCl (5 ml) and saturated NaHCO3 (7.5 ml)
3. extractionThe mixture was extracted with ethyl acetate
4. washwashed with brine
5. dry with materialdried over MgSO4
6. filtrationfiltered
7. concentrationconcentrated
8. customThe crude product was purified by silica gel chromatography

ORD record

ord-6189779f2a5b47e997735c1bd77b6458

Source dataset

uspto-grants-2014_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08772291B2