2,3-Dichloro-5,6-dicyano-1,4-benzoquinone → HCID 68153774, compound

HRID 341071Notes

Reaction equation

HRID 341071 reaction equation
[O:1]=[C:2]1[C:6]2=[CH:7][N:8]([CH2:15][C:16]3[CH:21]=[CH:20][C:19]([N:22]4[CH:26]=[CH:25][CH:24]=[N:23]4)=[CH:18][CH:17]=3)[C:9]3[CH:10]=[CH:11][CH:12]=[CH:13][C:14]=3[C:5]2=[N:4][N:3]1[C:27]1[CH:34]=[CH:33][CH:32]=[CH:31][C:28]=1[CH:29]=[O:30].C([BH3-])#N.[Na+].[BH4-].[Na+].ClC1C(=O)C(C#N)=C(C#N)C(=O)C=1Cl.C(=O)(O)[O-].[Na+]>O1CCCC1.ClCCl>[OH:30][CH2:29][C:28]1[CH:31]=[CH:32][CH:33]=[CH:34][C:27]=1[N:3]1[C:2](=[O:1])[C:6]2=[CH:7][N:8]([CH2:15][C:16]3[CH:21]=[CH:20][C:19]([N:22]4[CH:26]=[CH:25][CH:24]=[N:23]4)=[CH:18][CH:17]=3)[C:9]3[CH:10]=[CH:11][CH:12]=[CH:13][C:14]=3[C:5]2=[N:4]1

Participants

8

Reactant 5

HCID 67752,3-Dichloro-5,6-dicyano-1,4-benzoquinoneHCID 516892Sodium BicarbonateHCID 4311764Sodium borohydrideHCID 5003444Sodium cyanoborohydrideHCID 86668679HCID 86668679, compound

Product 1

HCID 68153774HCID 68153774, compound

Reagents, catalysts & solvents 2

HCID 6344DichloromethaneSolventHCID 8028TetrahydrofuranSolvent

Conditions

Temperature
0 °C

Procedure

2-(3-oxo-5-{[4-(1H-pyrazol-1-yl)phenyl]methyl}-3,5-dihydro-2H-pyrazolo[4,3-c]quinolin-2-yl)benzaldehyde (Example 529, 75 mg, 0.17 mmol) was suspended in tetrahydrofuran (5 mL) and cooled to 0° C. Sodium cyanoborohydride (0.067 mL, 1 M tetrahydrofuran solution, 0.067 mmol, 0.4 equiv) was added dropwise and the mixture was stirred for 1 hour at 0° C. The mixture was diluted with dichloromethane (3 mL) until homogeneous and stirred for an additional 1 hour at 0° C. Sodium borohydride (1 spatula tip, excess) was added and the mixture was stirred at 0° C. for 30 minutes. The mixture was warmed to ambient temperature, opened to the air and treated with dichloro-5,6-dicyanobenzoquinone (DDQ, 40 mg, 0.17 mmol, 1 equiv). After stirring for 30 minutes, the mixture was poured into sodium bicarbonate (50 mL, aqueous saturated) and extracted with ethyl acetate (3×50 mL) and chloroform (3×50 mL). The combined organic extracts were dried with sodium sulfate, filtered and concentrated in vacuo. The residue was purified by silica gel gradient chromatography (100:0 to 0:100 hexanes:ethyl acetate; then 100:0 to 0:100 ethyl acetate:ethyl acetate containing 5% methanol), providing the titled compound: 1H-NMR (400 MHz, CDCl3) δ 8.61 (1H, s), 8.35 (1H, d, J=7.4 Hz), 7.90 (1H, d, J=2.6 Hz), 7.72-7.70 (3H, m), 7.61 (1H, d, J=7.6 Hz), 7.57 (1H, d, J=7.5 Hz), 7.53 (1H, dd, J=7.6, 1.9 Hz), 7.51-7.47 (1H, m), 7.42 (1H, td, J=7.4, 1.5 Hz), 7.37 (1H, t, J=7.4 Hz), 7.29 (2H, d, J=8.6 Hz), 7.27 (1H, m), 6.47 (1H, m), 5.53 (2H, s), 5.21 (1H, br t, J=6.5 Hz), 4.53 (2H, d, J=5.8 Hz) ppm; high resolution mass spectrometry (ES+) m/z 448.1781 [(M+H)+; calculated for C27H22N5O2: 448.1768].

Workup

  1. stirringstirred for an additional 1 hour at 0° C
  2. stirringthe mixture was stirred at 0° C. for 30 minutes
  3. temperatureThe mixture was warmed to ambient temperature
  4. stirringAfter stirring for 30 minutes
  5. extractionextracted with ethyl acetate (3×50 mL) and chloroform (3×50 mL)
  6. dry with materialThe combined organic extracts were dried with sodium sulfate
  7. filtrationfiltered
  8. concentrationconcentrated in vacuo
  9. customThe residue was purified by silica gel gradient chromatography (100:0 to 0:100 hexanes

Sources & evidence

ORD record
ord-54373bf53ffd4594bd412e6c0ce66b4e
Source dataset
uspto-grants-2014_11
Patent number
US08895580B2

Reaction notes

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