Acetic Anhydride → 2-(3-Furyl)-4-(trifluoromethyl)phenyl acetate

温度

90 °C

2-Iodo-4-(trifluoromethyl)phenol (9.9 g, 0.0344 mol) was dissolved in 2-methyl tetrahydrofuran (100 mL) then potassium acetate (11.8 g, 0.12 mol) and 3-furylboronic acid (5.0 g, 0.0447 mol) was added and the reaction degasses 3 times before bis(tri-tert-butylphosphine) palladium (0) (1.0 g, 0.00196 mol) was added and the reaction degassed 3 more times. The reaction was then stirred at 90° C. under nitrogen for 18 hours. The reaction was then cooled and partitioned between EtOAc (50 mL) and water (50 mL), the organic layer was separated and dried in vacuo to give a brown oil. This was dissolved in tert-butyl methyl ether (50 mL), triethylamine (7.2 mL, 0.051 mol) added then acetic anhydride (4.7 mL, 0.051 mol) and stirred for 2 hours at room temperature. The reaction was then partitioned between EtOAc (30 ml) and water (30 ml) then organic layer was dried in vacuo to give a brown oil which crystallised upon standing. This was triturated with heptane to give the title product as a pale brown solid (8.04 g, 86.6%). LCMS Rt=1.70 min. 1H NMR (400 MHz, CDCl3): δ 2.34 (s, 3H), 6.67 (s, 1H) 7.26 (m, 1H) 7.51 (s, 1H), 7.57 (d, 1H), 7.76 (m 2H)

1. additionwas added
2. customthe reaction degassed 3 more times
3. temperatureThe reaction was then cooled
4. custompartitioned between EtOAc (50 mL) and water (50 mL)
5. customthe organic layer was separated
6. customdried in vacuo
7. customto give a brown oil
8. customThe reaction was then partitioned between EtOAc (30 ml) and water (30 ml)
9. customorganic layer was dried in vacuo
10. customto give a brown oil which
11. customcrystallised
12. customThis was triturated with heptane

ORDレコード

ord-8cabb55f57a94b10a776acc8ba283193

出典データセット

uspto-grants-2013_09

DOI

10.6084/m9.figshare.5104873.v1

特許番号

US08541588B2