Trifluoroacetic acid → Methyl 7-methoxy-2-oxo-1-(2-oxoethyl)-1,2-dihydroquinoline-3-carboxylate

HRID 39771Notes

Reaction equation

HRID 39771 reaction equation
[O:1]1CCO[CH:2]1[CH2:6][N:7]1[C:16]2[C:11](=[CH:12][CH:13]=[C:14]([O:17][CH3:18])[CH:15]=2)[CH:10]=[C:9]([C:19]([O:21][CH3:22])=[O:20])[C:8]1=[O:23].FC(F)(F)C(O)=O>>[CH3:18][O:17][C:14]1[CH:15]=[C:16]2[C:11]([CH:10]=[C:9]([C:19]([O:21][CH3:22])=[O:20])[C:8](=[O:23])[N:7]2[CH2:6][CH:2]=[O:1])=[CH:12][CH:13]=1

Participants

3

Reactant 2

HCID 6422Trifluoroacetic acidHCID 59398170HCID 59398170, compound

Product 1

HCID 59398418Methyl 7-methoxy-2-oxo-1-(2-oxoethyl)-1,2-dihydroquinoline-3-carboxylateYield 138%

Procedure

To 0.37 g of methyl 1-(1,3-dioxolan-2-ylmethyl)-7-methoxy-2-oxo-1,2-dihydroquinoline-3-carboxylate, 2 mL of 90% aqueous trifluoroacetic acid solution was added and stirred for 4 hours. The solvent was removed under reduced pressure, and aqueous saturated sodium hydrogen carbonate solution and chloroform were added. The organic layer was separated, and the aqueous layer was extracted with chloroform. The organic layer and extracts were combined, washed with aqueous saturated sodium chloride solution, dried over anhydrous magnesium sulfate, and the solvent was removed under reduced pressure to give 0.44 g of methyl 7-methoxy-2-oxo-1-(2-oxoethyl)-1,2-dihydroquinoline-3-carboxylate. (2) To 5 mL of a dichloromethane solution containing 0.44 g of methyl 7-methoxy-2-oxo-1-(2-oxoethyl)-1,2-dihydroquinoline-3-carboxylate, 0.46 g of tert-butyl (2,3-dihydro-1,4-benzodioxin-6-ylmethyl)(piperidin-4-yl)carbamate and 60 μL of acetic acid were added and stirred for 1 hour. To the reaction mixture, 0.37 g of sodium triacetoxyborohydride was added and stirred for 2 hours. Chloroform and water were added, the organic layer was separated, and the aqueous layer was extracted with chloroform. The organic layer and extracts were combined, washed with aqueous saturated sodium chloride solution, dried over anhydrous magnesium sulfate, and the solvent was removed under reduced pressure to give 0.31 g of methyl 1-(2-(4-((tert-butoxycarbonyl) (2,3-dihydro-1,4-benzodioxin-6-ylmethyl)amino)piperidin-1-yl)ethyl)-7-methoxy-2-oxo-1,2-dihydroquinoline-3-carboxylate as a yellow oil.

Workup

  1. customThe solvent was removed under reduced pressure, and aqueous saturated sodium hydrogen carbonate solution and chloroform
  2. additionwere added
  3. customThe organic layer was separated
  4. extractionthe aqueous layer was extracted with chloroform
  5. washwashed with aqueous saturated sodium chloride solution
  6. dry with materialdried over anhydrous magnesium sulfate
  7. customthe solvent was removed under reduced pressure

Sources & evidence

ORD record
ord-ff92b285e3f545e59c255763be809ed6
Source dataset
uspto-grants-2013_09
Patent number
US08524738B2

Reaction notes

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