Ethanol → 6-chloro-5-ethoxy-2-(trifluoromethyl)-2H-chromene-3-carboxylic acid

HRID 855144Notes

Reaction equation

[Cl:1][C:2]1[C:3]([O:21][CH2:22][CH3:23])=[C:4]2[C:9](=[CH:10][CH:11]=1)[O:8][CH:7]([C:12]([F:15])([F:14])[F:13])[C:6]([C:16]([O:18]CC)=[O:17])=[CH:5]2.O.[OH-].[Li+].C(O)C>C1COCC1.O>[Cl:1][C:2]1[C:3]([O:21][CH2:22][CH3:23])=[C:4]2[C:9](=[CH:10][CH:11]=1)[O:8][CH:7]([C:12]([F:15])([F:13])[F:14])[C:6]([C:16]([OH:18])=[O:17])=[CH:5]2

Participants

Conditions

Temperature: 80 °C

Procedure

To the solution of ethyl 6-chloro-5-ethoxy-2-(trifluoromethyl)-2H-chromene-3-carboxylate (300mg, 0.93 mmol) in 3 mL of THF was added a solution of lithium hydroxide hydrate (156 mg, 3.7 mmol) in 4 mL of water, followed by addition of 3 mL of ethanol. The resulting solution was heated to 80° C. for four hrs. After removing the solvent, the residue was acidified at 0° C. with ice-cold dilute hydrochloric acid. The product was extracted with EtOAc. After removing the solvents, the residue was purified on reverse phase HPLC. The product was obtained as white solid (120 mg). LC-MS (ES+) 323.2(M+1, 100). 1H NMR (CDCl3/400 MHz) 8.11(s, 1H), 7.32(d, J=8.8 Hz, 1H), 6.73(d, J=8.4 Hz, 1H), 5.65(q, J=6.8 Hz, 1H), 4.12(m, 2H), 1.44(t, J=7.2 Hz, 3H). 19F NMR(CDCl3/400 MHz) −78.81(d, J=6.8 Hz). 13C NMR(CDCl3/400 MHz) 169.5, 153.5, 152.8, 134.9, 134.3, 123.4(q, J=285.8 Hz), 121.3, 115.8, 115.5, 112.8, 71.6, 70.2(q, J=33.4 Hz), 15.5. HRMS (EI+) m/z calc. For (C13H10ClF3O4) 322.0220 (M+), found:322.0223.

Workup

customAfter removing the solvent
customwas acidified at 0° C. with ice-cold dilute hydrochloric acid
extractionThe product was extracted with EtOAc
customAfter removing the solvents
customthe residue was purified on reverse phase HPLC

Sources & evidence

ORD record: ord-9f7105ef7b00477bb37638dcce0001b7
Source dataset: uspto-grants-2007_08
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07259266B2

Reaction notes

Loading…