2-Pyridinecarboxaldehyde → HCID 178519074, compound

HRID 1967995Notes

Reaction equation

HRID 1967995 reaction equation
[NH2:1][C:2]1[CH:10]=[CH:9][CH:8]=[C:7]2[C:3]=1[CH2:4][O:5][C:6]2=[O:11].[N:12]1[CH:17]=[CH:16][CH:15]=[CH:14][C:13]=1[CH:18]=O.[O-]S([O-])(=O)=O.[Mg+2]>ClCCl>[N:12]1[CH:17]=[CH:16][CH:15]=[CH:14][C:13]=1/[CH:18]=[N:1]/[C:2]1[CH:10]=[CH:9][CH:8]=[C:7]2[C:3]=1[CH2:4][O:5][C:6]2=[O:11]

Participants

5

Reactant 3

HCID 142732-PyridinecarboxaldehydeHCID 24083Sulfuric acid magnesium salt (1:1)HCID 122846494-Amino-1,3-dihydro-2-benzofuran-1-one

Product 1

HCID 178519074HCID 178519074, compoundYield 49.9%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

4-Aminoisobenzofuran-1(3H)-one (600 mg, 4 mmol), picolinaldehyde (856 mg, 8 mmol) and 1 g of MgSO4 were added into 40 mL of dichloromethane and the mixture was stirred under reflux overnight, then the mixture was evaporated under reduced pressure and the residues was dried in vacuum. 476 mg of (E)-4-(pyridin-2-ylmethyleneamino) isobenzofuran-1(3H)-one was obtained. A mixture of (E)-4-(pyridin-2-ylmethyleneamino) isobenzofuran-1(3H)-one (476 mg, 2 mmol), benzaldehyde (212 mg, 2 mmol), sodium methanolate (432 mg, 8 mmol) and ethyl propionate (40 mL) was stirred at room temperature overnight. Then the resulting mixture was evaporated under reduced pressure and extracted with ethyl acetate (100 mL×4) and concentrated. The crude product was purified by column chromatography (silica gel, petroleum ether:ethyl acetate 20:1 to 5:1) to give 30 mg of methyl 4-oxo-3-phenyl-2-(pyridin-2-yl)-1,2,3,4-tetrahydroquinoline-5-carboxylate; yield 5%. LC-MS (ESI) m/z: 459 (M+1)+.

Workup

  1. temperatureunder reflux overnight
  2. customthe mixture was evaporated under reduced pressure
  3. customthe residues was dried in vacuum

Sources & evidence

ORD record
ord-26b5fcb98b664493a881d269a37a34f1
Source dataset
uspto-grants-2013_04
Patent number
US08420650B2

Reaction notes

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