Trifluoroacetic acid → Methyl 2-(4-chloro-3-nitrophenyl)-3,3-dimethyl-1,2,3,4-tetrahydroquinoline-6-carboxylate

HRID 1801273Notes

Reaction equation

HRID 1801273 reaction equation
[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([CH:8]2[C:17]([CH3:19])([CH3:18])[CH:16](O)[C:15]3[C:10](=[CH:11][CH:12]=[C:13]([C:21]([O:23][CH3:24])=[O:22])[CH:14]=3)[NH:9]2)=[CH:4][C:3]=1[N+:25]([O-:27])=[O:26].C([SiH](CC)CC)C.FC(F)(F)C(O)=O.C(=O)(O)[O-].[Na+]>ClCCl>[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([CH:8]2[C:17]([CH3:19])([CH3:18])[CH2:16][C:15]3[C:10](=[CH:11][CH:12]=[C:13]([C:21]([O:23][CH3:24])=[O:22])[CH:14]=3)[NH:9]2)=[CH:4][C:3]=1[N+:25]([O-:27])=[O:26]

Participants

6

Reactant 4

HCID 6422Trifluoroacetic acidHCID 12052TriethylsilaneHCID 516892Sodium BicarbonateHCID 67440905Methyl 2-(4-chloro-3-nitrophenyl)-4-hydroxy-3,3-dimethyl-1,2,3,4-tetrahydroquinoline-6-carboxylate

Product 1

HCID 67443541Methyl 2-(4-chloro-3-nitrophenyl)-3,3-dimethyl-1,2,3,4-tetrahydroquinoline-6-carboxylateYield 2.2%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

To a solution of methyl 2-(4-chloro-3-nitrophenyl)-4-hydroxy-3,3-dimethyl-1,2,3,4-tetrahydroquinoline-6-carboxylate (8.2 g, 21 mmol) in dichloromethane (150 mL), which was cooled to −10° C. under a nitrogen atmosphere, was added triethylsilane (7.08 g, 60.9 mmol) and trifluoroacetic acid (9.82 g, 86.1 mmol). The resulting reaction mixture was stirred overnight at room temperature. The mixture was neutralized with 20 g of Sodium bicarbonate. The solid was filtered and the filtrate was evaporated to remove the solvent. The residue was dissolved in methanol, and insoluble solid was the crude product (3.0 g). The filtrate was purified on silica gel to afford 170 mg of methyl 2-(4-chloro-3-nitrophenyl)-3,3-dimethyl-1,2,3,4-tetrahydroquinoline-6-carboxylate.

Workup

  1. customThe resulting reaction mixture
  2. filtrationThe solid was filtered
  3. customthe filtrate was evaporated
  4. customto remove the solvent
  5. dissolutionThe residue was dissolved in methanol
  6. customThe filtrate was purified on silica gel

Sources & evidence

ORD record
ord-649a142c742f486d8a1c15a585fb0700
Source dataset
uspto-grants-2013_01
Patent number
US08344137B2

Reaction notes

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