Hydrochloric Acid → 8-(Pyridine-3-carbonyl)-1,2,5,6-tetrahydro-pyrrolo[3,2,1-ij]quinolin-4-one

HRID 2358975Notes

Reaction equation

HRID 2358975 reaction equation
[Al+3].[Cl-].[Cl-].[Cl-].[Na+].[Cl-].[CH2:7]1[C:17]2=[C:18]3[C:13](=[CH:14][CH:15]=[CH:16]2)[CH2:12][CH2:11][C:10](=[O:19])[N:9]3[CH2:8]1.Cl.[C:21](Cl)(=[O:28])[C:22]1[CH:27]=[CH:26][CH:25]=[N:24][CH:23]=1.Cl>C(O)C.O>[N:24]1[CH:25]=[CH:26][CH:27]=[C:22]([C:21]([C:15]2[CH:14]=[C:13]3[C:18]4=[C:17]([CH2:7][CH2:8][N:9]4[C:10](=[O:19])[CH2:11][CH2:12]3)[CH:16]=2)=[O:28])[CH:23]=1

Participants

8

Reactant 5

HCID 313Hydrochloric AcidHCID 5234Sodium ChlorideHCID 884383-Pyridinecarbonyl chloride, hydrochloride (1:1)HCID 91665PyroquilonHCID 6451240Aluminum(III) Chloride2×

Product 1

HCID 444798818-(Pyridine-3-carbonyl)-1,2,5,6-tetrahydro-pyrrolo[3,2,1-ij]quinolin-4-oneYield 22.4%

Reagents, catalysts & solvents 2

HCID 702EthanolSolventHCID 962WaterSolvent

Procedure

To a molten mixture of AlCl3 (8.0 g, 60.0 mmol) and NaCl (2.34 g, 40.0 mmol) at 150° C. was added 1,2,5,6-tetrahydro-pyrrolo[3,2,1-ij]quinolin-4-one (1.79 g, 10.0 mmol) and thereafter nicotinoylchloride hydrochloride salt (1.96 g, 11.0 mmol) portionwise. After stirring for 15 min and cooling to room temperature, excess aluminum chloride was decomposed by the addition of a chilled mixture of 10 ml concentrated hydrochloric acid and 200 ml water. Neutralization with NaHCO3 solution and subsequent extraction with ethyl acetate (3×100 ml), followed by drying over MgSO4 and removal of the solvent gave the crude product. Purification by crystallization from ethanol gave the acylation product (624 mg, 2.24 mmol, 22%) as a yellow solid, mp (ethanol) 147° C. 1H-NMR (500 MHz, CDCl3): δ=2.72 (t, 3J=7.9 Hz, 2H), 3.02 (t, 3J=7.9 Hz, 2H), 3.23 (t, 3J=8.6 Hz, 2H), 4.14 (t, 3J=8.6 Hz, 2H), 7.44 (ddd, 3J=7.9 Hz, 3J=4.7 Hz, 5J=1.0 Hz, 1H), 7.53 (s, 1H), 7.58 (s, 1H), 8.06 (m, 1H), 8.78 (dd, 3J=5.0 Hz, 4J=1.9 Hz, 1H), 8.92 (dd, 4J=1.9 Hz, 5J=0.8 Hz, 1H). 13C-NMR (125 MHz, CDCl3): δ=24.2, 27.3, 31.4, 45.8, 199.9, 123.4, 126.1, 128.9, 129.4, 132.3, 134.0, 137.0, 146.1, 150.4, 152.4, 167.8, 193.6. MS m/z 278.79 (MH+).

Workup

  1. extractionNeutralization with NaHCO3 solution and subsequent extraction with ethyl acetate (3×100 ml)
  2. dry with materialby drying over MgSO4 and removal of the solvent
  3. customgave the crude product
  4. customPurification
  5. customby crystallization from ethanol

Sources & evidence

ORD record
ord-2dc8f9a38f8e4fe193bd97381b538e14
Source dataset
uspto-grants-2014_04
Patent number
US08685960B2

Reaction notes

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