Resorcinol → 3-Chloro-1-(2,4-dihydroxyphenyl)propan-1-one

Temperature

80 °C

To a stirred mixture of resorcinol (10 g, 91 mmol) and 3-chloropropanoic acid (9.95 g, 92 mmol) was added trifluoromethanesulfonic acid (50 g, 333 mmol) in one portion. The solution was warmed to 80° C. for 30 min, cooled to room temperature over 15 min, and poured into dichloromethane (200 mL). The resulting solution was slowly poured into water (200 mL), and the layers were separated. The aqueous layer was extracted with dichloromethane (2×100 mL), dried over anhydrous sodium sulfate, and filtered. Concentration under reduced pressure afforded 3-chloro-1-(2,4-dihydroxyphenyl)propan-1-one (13.62 g, 67.9 mmol, 74.8% yield) as an orange semi-solid. The compound was used without any further purification. LC/MS M+1=200; 1H NMR (400 MHz, CDCl3) δ ppm 12.39 (1H, s), 7.56 (1H, d, J=8.58 Hz), 7.19 (1H, s), 6.17-6.49 (1H, m), 5.23 (1H, s), 3.78-4.01 (2H, m), and 3.34 (2H, t, J=6.71 Hz).

1. temperaturecooled to room temperature over 15 min
2. customthe layers were separated
3. extractionThe aqueous layer was extracted with dichloromethane (2×100 mL)
4. dry with materialdried over anhydrous sodium sulfate
5. filtrationfiltered
6. concentrationConcentration under reduced pressure

ORD record

ord-e3cc1b314e474522a86bd868bbf8e0fb

Source dataset

uspto-grants-2015_12

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09216972B2