Water → 4‐Bromo‐6,8‐dihydroxy‐2‐(4‐hydroxyphenyl)‐1,2‐ dihydroisoquinolin‐1‐one

4-Bromo-6-methoxy-2-(4-methoxyphenyl)-1-oxo-1,2-dihydroisoquinolin-8-yl-4-(trifluoromethyl)benzoate (0.47 g, 0.86 mmol) was placed in a dry 250 mL single-necked round-bottomed flask fitted with a stirring bar and sealed with a septa. Anhydrous methylene chloride (20 mL) was added via a syringe at room temperature. BBr3 (8.60 mL of 1.0 M CH2Cl2 solution, 8.60 mmol) was added drop wise with stirring at room temperature. The resulting solution was heated to reflux for 20 hours and then stirred at room temperature for 3 days. 20 mL of water was added to quench the reaction. CH2Cl2 layer was separated and the aqueous layer was extracted with EtOAc (3×20 mL). The organic layers were combined and dried over anhydrous MgSO4. The solvent was removed under reduced pressure. The residue was purified by column chromatography (silica-gel, CH2Cl2/MeOH=9/1 v/v) to give a white solid product, 0.05 g, 16.7% yield. MS: m/e 347.8 [M−H]−. 1H NMR (DMSO-d6, 300 MHz): δ 13.12 (s, 1H), 10.78 (s, 1H), 9.81 (s, 1H), 7.75 (s, 1H), 7.28 (d, 2H, J=8.7 Hz), 6.85 (d, 2H, J=8.7 Hz), 6.61 (d, 1H, J=2.1 Hz), 6.37 (d, 1H, J=2.1 Hz).

1. customfitted with a stirring bar
2. customsealed with a septa
3. temperatureThe resulting solution was heated
4. temperatureto reflux for 20 hours
5. stirringstirred at room temperature for 3 days
6. customto quench
7. customthe reaction
8. customCH2Cl2 layer was separated
9. extractionthe aqueous layer was extracted with EtOAc (3×20 mL)
10. dry with materialdried over anhydrous MgSO4
11. customThe solvent was removed under reduced pressure
12. customThe residue was purified by column chromatography (silica-gel, CH2Cl2/MeOH=9/1 v/v)
13. customto give a white solid product, 0.05 g, 16.7% yield

ORD record

ord-c0a19040f02b473c902a6c558129a29f

Source dataset

uspto-grants-2015_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09078888B2