1-Ethyl-3-(3'-dimethylaminopropyl)carbodiimide → Ethyl 3-[7-(5-{5-chloro-6-[(1-methylethyl)oxy]-3-pyridinyl}-1,2,4-oxadiazol-3-yl)-4-fluoro-1H-indol-3-yl]propanoate

HRID 1512760Notes

Reaction equation

HRID 1512760 reaction equation
C1C=CC2N(O)N=NC=2C=1.CCN=C=NCCCN(C)C.[Cl:22][C:23]1[CH:24]=[C:25]([C:33]([OH:35])=O)[CH:26]=[N:27][C:28]=1[O:29][CH:30]([CH3:32])[CH3:31].[F:36][C:37]1[CH:45]=[CH:44][C:43](/[C:46](/[NH:49]O)=[N:47]/[H])=[C:42]2[C:38]=1[C:39]([CH2:51][CH2:52][C:53]([O:55][CH2:56][CH3:57])=[O:54])=[CH:40][NH:41]2.CCCC[N+](CCCC)(CCCC)CCCC.[F-]>C1COCC1>[Cl:22][C:23]1[CH:24]=[C:25]([C:33]2[O:35][N:47]=[C:46]([C:43]3[CH:44]=[CH:45][C:37]([F:36])=[C:38]4[C:42]=3[NH:41][CH:40]=[C:39]4[CH2:51][CH2:52][C:53]([O:55][CH2:56][CH3:57])=[O:54])[N:49]=2)[CH:26]=[N:27][C:28]=1[O:29][CH:30]([CH3:31])[CH3:32]

Participants

7

Reactant 5

HCID 159081-Ethyl-3-(3'-dimethylaminopropyl)carbodiimideHCID 757711-HydroxybenzotriazoleHCID 2724141Tetrabutylammonium FluorideHCID 180705825-Chloro-6-isopropoxynicotinic acidHCID 178506502HCID 178506502, compound

Product 1

HCID 58222468Ethyl 3-[7-(5-{5-chloro-6-[(1-methylethyl)oxy]-3-pyridinyl}-1,2,4-oxadiazol-3-yl)-4-fluoro-1H-indol-3-yl]propanoateYield 86.6%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent2×

Procedure

HOBT (163 mg) and EDCI (204 mg) were added to a solution of 5-chloro-6-[(1-methylethyl)oxy]-3-pyridinecarboxylic acid (118 mg) in THF (4 mL). The resulting solution was stirred for 2 hours. Ethyl 3-{4-fluoro-7-[(Z)-(hydroxyamino)(imino)methyl]-1H-indol-3-yl}propanoate (D45) (208 mg) in THF (4 mL) was added, and the reaction mixture was stirred at RT overnight. TBAF (780 mg) was then added. The reaction vessel was sealed and heated in Biotage Initiator using initial normal to 120° C. for 2.5 hours. After cooling, the reaction was quenched with water, and extracted with EtOAc for 3 times. The combined organic solution was washed with brine, and dried over anhydrous sodium sulfate. The dried solution was concentrated. The residue was purified by column chromatography (10% EtOAc in hexane) to afford ethyl 3-[7-(5-{5-chloro-6-[(1-methylethyl)oxy]-3-pyridinyl}-1,2,4-oxadiazol-3-yl)-4-fluoro-1H-indol-3-yl]propanoate (D48) (224 mg) as a pale yellow solid. δH (CDCl3, 400 MHz): 1.25 (3H, t), 1.46 (6H, d), 2.76 (2H, t), 3.24 (2H, t), 4.14 (2H, q), 5.51 (1H, m), 6.91 (1H, dd), 7.15 (1H, d), 8.04 (1H, dd), 8.43 (1H, d), 8.91 (1H, d), 9.67 (1H, br s). MS (ES): C23H22ClFN4O4 requires 472; found 473.2 (M+H+).

Workup

  1. stirringthe reaction mixture was stirred at RT overnight
  2. customThe reaction vessel was sealed
  3. temperatureheated in Biotage Initiator
  4. customnormal to 120° C.
  5. customfor 2.5 hours
  6. temperatureAfter cooling
  7. customthe reaction was quenched with water
  8. extractionextracted with EtOAc for 3 times
  9. washThe combined organic solution was washed with brine
  10. dry with materialdried over anhydrous sodium sulfate
  11. concentrationThe dried solution was concentrated
  12. customThe residue was purified by column chromatography (10% EtOAc in hexane)

Sources & evidence

ORD record
ord-d741109127c34c35891328629aff50a3
Source dataset
uspto-grants-2012_07
Patent number
US08217028B2

Reaction notes

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