Dicyclohexylcarbodiimide → 4-Cyano-3-methylbenzoic acid

HRID 1661572Notes

Reaction equation

HRID 1661572 reaction equation
[N:1]1[CH:6]=[CH:5][CH:4]=[C:3]([C:7]2[NH:8][C:9]3[C:14]([CH:15]=2)=[CH:13][C:12]([C:16]#[N:17])=[CH:11][CH:10]=3)[CH:2]=1.[C:18]([C:20]1[CH:28]=[CH:27][C:23]([C:24]([OH:26])=[O:25])=[CH:22][C:21]=1[CH3:29])#[N:19].C1CCC(N=C=NC2CCCCC2)CC1>CN(C)C1C=CN=CC=1.ClCCl>[C:18]([C:20]1[CH:28]=[CH:27][C:23]([C:24]([OH:26])=[O:25])=[CH:22][C:21]=1[CH3:29])#[N:19].[C:18]([C:20]1[CH:28]=[CH:27][C:23]([C:24]([N:8]2[C:9]3[C:14](=[CH:13][C:12]([C:16]#[N:17])=[CH:11][CH:10]=3)[CH:15]=[C:7]2[C:3]2[CH:2]=[N:1][CH:6]=[CH:5][CH:4]=2)=[O:25])=[CH:22][C:21]=1[CH3:29])#[N:19]

Participants

7

Reactant 3

HCID 10868DicyclohexylcarbodiimideHCID 102410994-Cyano-3-methylbenzoic acidHCID 445541352-pyridin-3-yl-1H-indole-5-carbonitrile

Product 2

HCID 102410994-Cyano-3-methylbenzoic acidHCID 582157251-(4-cyano-3-methyl-benzoyl)-2-pyridin-3-yl-1H-indole-5-carbonitrile

Reagents, catalysts & solvents 2

HCID 142844-(Dimethylamino)pyridineCatalystHCID 6344DichloromethaneSolvent

Procedure

4-Cyano-3-methyl-benzoic acid is synthesized based on the method described in patent EP1512687A1. To a solution of 2-pyridin-3-yl-1H-indole-5-carbonitrile (20 mg, 0.09 mmol), 4-dimethylaminopyridine (22 mg, 0.01 mmol) and 4-cyano-3-methyl-benzoic acid (29 mg, 0.18 mmol) at 0° C. in dichloromethane (2 mL) is added DCC (38 mg, 0.18 mmol). After stirring for 10 min the reaction is warmed to room temperature. A precipitate forms and stirring is continued for 16 h. The mixture is filtered and the filtrate is diluted with dichloromethane (10 mL), washed with water and a saturated sodium chloride solution. The combined organic extracts are dried over sodium sulfate, filtered, and concentrated. The resulting residue is purified by silica gel flash chromatography (ethyl acetate-heptane, 0:1 to 1:1) to furnish 1-(4-cyano-3-methyl-benzoyl)-2-pyridin-3-yl-1H-indole-5-carbonitrile. 1H NMR (400 MHz, CDCl3) δ ppm 2.47 (s, 3H), 6.91 (s, 1H), 7.14 (dd, J=8.0, 4.9 Hz, 1H), 7.43-7.48 (m, 2H), 7.49-7.54 (m, 2H), 7.61 (dd, J=8.7, 1.6 Hz, 1H), 7.93 (d, J=8.6 Hz, 1H), 8.03 (d, J=1.0\Hz, 1H), 8.44 (dd, J=4.8, 1.5 Hz, 1H), 8.55 (d, J=1.8 Hz, 1H). HRMS (ESI) m/z 363.1245 [(M+H)+: Calcd for C23H16N4O: 363.1246].

Workup

  1. stirringA precipitate forms and stirring
  2. waitis continued for 16 h
  3. filtrationThe mixture is filtered
  4. additionthe filtrate is diluted with dichloromethane (10 mL)
  5. washwashed with water
  6. dry with materialThe combined organic extracts are dried over sodium sulfate
  7. filtrationfiltered
  8. concentrationconcentrated
  9. customThe resulting residue is purified by silica gel flash chromatography (ethyl acetate-heptane, 0:1 to 1:1)

Sources & evidence

ORD record
ord-3c4fbb67064a4a2b815b6b364ea8e097
Source dataset
uspto-grants-2011_10
Patent number
US08030334B2

Reaction notes

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