Potassium Carbonate → Ethyl 2-(1-(benzo[d]thiazol-2-ylcarbamoyl)indolin-6-yl)thiazole-4-carboxylate

HRID 1896603Notes

Reaction equation

HRID 1896603 reaction equation
[NH:1]1[C:9]2[C:4](=[CH:5][CH:6]=[C:7]([C:10]3[S:11][CH:12]=[C:13]([C:15]([O:17][CH2:18][CH3:19])=[O:16])[N:14]=3)[CH:8]=2)[CH2:3][CH2:2]1.C([O-])([O-])=O.[K+].[K+].[S:26]1[C:30]2[CH:31]=[CH:32][CH:33]=[CH:34][C:29]=2[N:28]=[C:27]1[NH:35][C:36](=O)[O:37]C1C=CC([N+]([O-])=O)=CC=1>C(#N)C.CCOC(C)=O>[S:26]1[C:30]2[CH:31]=[CH:32][CH:33]=[CH:34][C:29]=2[N:28]=[C:27]1[NH:35][C:36]([N:1]1[C:9]2[C:4](=[CH:5][CH:6]=[C:7]([C:10]3[S:11][CH:12]=[C:13]([C:15]([O:17][CH2:18][CH3:19])=[O:16])[N:14]=3)[CH:8]=2)[CH2:3][CH2:2]1)=[O:37]

Participants

6

Reactant 3

HCID 11430Potassium CarbonateHCID 594186764-Nitrophenyl benzo[d]thiazol-2-ylcarbamateHCID 59418774Ethyl 2-(indolin-6-yl)thiazole-4-carboxylate

Product 1

HCID 59418682Ethyl 2-(1-(benzo[d]thiazol-2-ylcarbamoyl)indolin-6-yl)thiazole-4-carboxylateYield 34.9%

Reagents, catalysts & solvents 2

HCID 6342AcetonitrileSolventHCID 8857Ethyl AcetateSolvent

Procedure

A mixture of ethyl 2-(indolin-6-yl)thiazole-4-carboxylate (28D) (56 mg, 0.14 mmol), K2CO3 (22 mg, 0.16 mmol), and 4-nitrophenyl benzo[d]thiazol-2-ylcarbamate (19) (48 mg, 0.15 mmol) was heated to reflux in acetonitrile (3 mL) for 5.5 hours. The reaction mixture was cooled to rt and diluted in EtOAc (5 mL), washed with water, dried over MgSO4, filtered, and concentrated under reduced pressure. The crude material was purified by column chromatography on silica gel eluting with a gradient of PE/EtOAc (1:1), to provide 22 mg (34%) of the desired product ethyl 2-(1-(benzo[d]thiazol-2-ylcarbamoyl)indolin-6-yl)thiazole-4-carboxylate (28E): 1H NMR (300 MHz, CDCl3) δ 8.67 (1H, s), 8.12 (1H, s), 7.68 (2H, m), 7.52 (1H, m), 7.38 (1H, m), 7.25 (2H, m), 4.43 (2H, q), 4.22 (2H, m), 3.18 (2H, m) 1.45 (3H, t). LC/MS (APCI): m/z 451.1 (M+H).

Workup

  1. temperaturewas heated
  2. washwashed with water
  3. dry with materialdried over MgSO4
  4. filtrationfiltered
  5. concentrationconcentrated under reduced pressure
  6. customThe crude material was purified by column chromatography on silica gel eluting with a gradient of PE/EtOAc (1:1)

Sources & evidence

ORD record
ord-74c30cbc9370420aa4381d9fdca275d6
Source dataset
uspto-grants-2013_08
Patent number
US08518970B2

Reaction notes

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