Triethylamine → 6-Bromo-4-[1-(3-phenyl-allyl)-piperidine-4-ylamino]-chromen-2-One

Temperature

150 °C

To a solution of 4-amino-1-cinnamylpiperidine (1.3 g, 6 mmol) and triethylamine (1.6 mL, 7.2 mmol) in dry acetonitrile (125 mL) was added trifluoromethanesulfonic acid 6-bromo-2-oxo-2H-chromen-4-yl ester (2.23 g, 6 mmol). About 5 mL of solution was added to each of 25 dry microwave vials equipped with stir bars. The vials were capped and each was heated at 150° C. for 5 minutes in the microwave. The solutions were combined, concentrated and dissolved in chloroform. The solution was washed with water and brine and dried over Na2SO4, and concentrated. The residue was purified by flash chromatography through a silica gel column with dichloromethane and methanol (95:5 v/v) to provide the desired compound (900 mg, 34%) as a yellow solid. MS (ESI(+)Q1MS m/z 440 (M+2H)+; 1H NMR (300 MHz, DMSO) δ ppm 1.57-1.67 (m, 2H), 1.89-1.95 (m, 2H), 2.13 (m, 2H), 2.92 (m, 2H), 3.13 (m, 2H), 3.50 (m, 1H), 5.28 (sd, 1H), 6.35 (dt, 1H), 6.56 (d, 1H), 7.24-7.47 (m. 7H), 7.74 (dd, 1H), 8.45 (d, 1H).

1. customdry microwave vials
2. customequipped with stir bars
3. customThe vials were capped
4. concentrationconcentrated
5. dissolutiondissolved in chloroform
6. washThe solution was washed with water and brine
7. dry with materialdried over Na2SO4
8. concentrationconcentrated
9. customThe residue was purified by flash chromatography through a silica gel column with dichloromethane and methanol (95:5 v/v)

ORD record

ord-cdabeadd1bfa4657ad47c2403af8ae7b

Source dataset

uspto-grants-2005_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06921821B2