1-(diphenylmethyl)-3-hydroxy-3-(7-hydroxyquinoxalin-6-yl)-1,3-dihydro-2H-indol-2-one → 1-(diphenylmethyl)-3-(7-hydroxyquinoxalin-6-yl)-1,3-dihydro-2H-indol-2-one

To thionyl chloride (60 mL) was added 1-(diphenylmethyl)-3-hydroxy-3-(7-hydroxyquinoxalin-6-yl)-1,3-dihydro-2H-indol-2-one (3.0 g, 6.53 mmol) at −10° C. The resulting reaction mixture was stirred at 0° C. for 1 h, and concentrated in vacuo. The residue was dissolved in acetic acid (150 mL), followed by the addition of zinc dust (4.50 g, 68.81 mmol). The resulting mixture was stirred at ambient temperature for 40 min. The solids were filtered out. The filtrate was concentrated in vacuo. The residue was dissolved in ethyl acetate (200 mL), washed with water and brine, dried over anhydrous sodium sulfate and filtered. The filtrate was concentrated in vacuo, the residue was purified by column chromatography (dichloromethane/methanol 200/1) to give 1-(diphenylmethyl)-3-(7-hydroxyquinoxalin-6-yl)-1,3-dihydro-2H-indol-2-one (2.40 g, 83%): MS (ES+) m/z 444 (M+1).

1. customThe resulting reaction mixture
2. concentrationconcentrated in vacuo
3. dissolutionThe residue was dissolved in acetic acid (150 mL)
4. stirringThe resulting mixture was stirred at ambient temperature for 40 min
5. filtrationThe solids were filtered out
6. concentrationThe filtrate was concentrated in vacuo
7. dissolutionThe residue was dissolved in ethyl acetate (200 mL)
8. washwashed with water and brine
9. dry with materialdried over anhydrous sodium sulfate
10. filtrationfiltered
11. concentrationThe filtrate was concentrated in vacuo
12. customthe residue was purified by column chromatography (dichloromethane/methanol 200/1)

ORD record

ord-a180779e8b204a3d92a14b2c78cbfe25

Source dataset

uspto-grants-2014_12

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08916580B2