Hexafluoroacetone → HCID 57644081, compound

Temperature

-78 °C

To a solution of 5-bromo-2-furoic acid (191 mg 1 mmol) in THF (8 ml), was added n-butyllithium in hexanes solution (2.5 M, 1.2 ml, 3 mmol) at −78° C. under a nitrogen atmosphere. The resulting mixture was stirred at −78° C. for 30 minutes. Hexafluoroacetone (1.2 g, 7.3 mmol) was bubbled into the reaction mixture and the resulting solution was stirred for another 30 minutes at −78° C. The reaction mixture was allowed to warm to r.t. and then quenched with H2O. Solvent was evaporated, and the residue was dissolved in EtOAc. The organic layer was washed with H2O and brine, dried (MgSO4) and evaporated. The residue was purified by preparative TLC (hexanes:ethyl acetate, 2:1) to afford the title compound (109 mg) as a yellow oil. 1H NMR δ0.93 (t, 3H), 1.38 (m, 2H), 1.68 (m, 2H), 2.80 (t, 2H), 7.19 (d, 1H), 7.80 (d, 1H); ESIMS: m/z 319 (M+H).

1. stirringthe resulting solution was stirred for another 30 minutes at −78° C
2. temperatureto warm to r.t.
3. customquenched with H2O
4. customSolvent was evaporated
5. dissolutionthe residue was dissolved in EtOAc
6. washThe organic layer was washed with H2O and brine
7. dry with materialdried (MgSO4)
8. customevaporated
9. customThe residue was purified by preparative TLC (hexanes:ethyl acetate, 2:1)

ORD record

ord-a731e79057344ad6bcc26f8ce814e793

Source dataset

uspto-grants-2009_04

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07524969B2