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Oxalic Acid → HCID 59454955, compound

HRID 1401565
Notes
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Reaction equation

HRID 1401565 reaction equation
[CH3:1][CH:2]1[C:14]2[C:13]3[CH:12]=[C:11]([CH3:15])[CH:10]=[CH:9][C:8]=3[NH:7][C:6]=2[CH2:5][CH:4]([CH3:16])[N:3]1[CH3:17].P([O-])([O-])([O-])=O.[K+].[K+].[K+].Br[CH:27]=[C:28]([C:33]1[CH:38]=[CH:37][N:36]=[CH:35][CH:34]=1)[C:29](C)(C)C.C(O)(=O)C(O)=O>CN(C=O)C.C1COCC1.N1CCC[C@H]1C(O)=O.[Cu]I>[CH3:1][CH:2]1[C:14]2[C:13]3[CH:12]=[C:11]([CH3:15])[CH:10]=[CH:9][C:8]=3[N:7](/[CH:27]=[C:28](/[C:33]3[CH:38]=[CH:37][N:36]=[CH:35][CH:34]=3)\[CH3:29])[C:6]=2[CH2:5][CH:4]([CH3:16])[N:3]1[CH3:17]
ParticipantsProcedureWorkupSources & evidenceReaction notes

Participants

8

Reactant 4

HCID 971Oxalic AcidHCID 62657Potassium Phosphate, TribasicHCID 67309717HCID 67309717, compoundHCID 86644760HCID 86644760, compound

Product 1

HCID 59454955HCID 59454955, compound

Reagents, catalysts & solvents 3

HCID 67304547
HCID 67304547, compound
Catalyst
HCID 6228DimethylformamideSolvent
HCID 8028TetrahydrofuranSolvent

Procedure

2,3,4,5-Tetrahydro-1,2,3,8-tetramethyl-1H-pyrido[4,3-b]indole (550 mg, 2 mmol) was dissolved in DMF. Copper (I) iodide L-proline (46 mg, 0.4 mmol) and potassium phosphate (848 mg, 4 mmol) were added and the reaction mixture was stirred for 10 min. at RT. 4-(1-bromo-3,3-dimethylbut-1-en-2-yl)pyridine (294 mg, 3.0 mmol) was added dropwise and the reaction mixture was purged with nitrogen. The reaction mixture was heated overnight at 85° C. (prolonged heating in some cases was required). DMF was evaporated under reduced pressure, the residue was diluted with water and the solid was filtered. The solid material was purified by silica gel chromatography (100-200 mesh). The product was further purified by HPLC. The free base was converted into oxalate salt by treatment of oxalic acid (1 equiv) in THF. Yield: 8 mg as the oxalate salt. 1H NMR (CD3OD, freebase) δ (ppm): 8.60 (d, 2H), 7.70 (d, 2H), 7.35 (s, 1H), 7.30 (s, 1H), 7.10 (m, 2H), 4.50 (m, 1H), 4.0 (m, 1H), 3.10 (m, 1H), 2.90 (s, 3H), 2.80 (m, 1H), 2.42 (s, 3H), 2.0 (s, 3H), 1.76 (d, 3H), 1.50 (d, 3H).

Workup

  1. customthe reaction mixture was purged with nitrogen
  2. temperatureThe reaction mixture was heated overnight at 85° C. (
  3. temperatureprolonged heating in some cases
  4. customDMF was evaporated under reduced pressure
  5. additionthe residue was diluted with water
  6. filtrationthe solid was filtered
  7. customThe solid material was purified by silica gel chromatography (100-200 mesh)
  8. customThe product was further purified by HPLC

Sources & evidence

ORD record
ord-1e6c7d2084fb42dfb1f153a9d422a74a
Source dataset
uspto-grants-2014_12
DOI
10.6084/m9.figshare.5104873.v1
Patent number
US08907097B2

Reaction notes

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On this pageParticipantsProcedureWorkupSources & evidenceReaction notes