2-Aminopyridine → 2-(8-Chloro-3-oxo-3,9-dihydro-1H-chromeno[2,3-c]pyrrol-2-yl)-4-methyl-pentanoic acid pyridin-2-ylamide

HRID 1925886Notes

Reaction equation

HRID 1925886 reaction equation
[Cl:1][C:2]1[CH:11]=[CH:10][CH:9]=[C:8]2[C:3]=1[CH2:4][C:5]([CH2:14][N:15](C)[C@@H:16]([CH2:20][CH:21]([CH3:23])[CH3:22])[C:17]([OH:19])=O)=[C:6]([CH:12]=[O:13])[O:7]2.[NH2:25][C:26]1[CH:31]=[CH:30][CH:29]=[CH:28][N:27]=1.ON1C2C=CC=CC=2N=N1>C(Cl)Cl.O>[N:27]1[CH:28]=[CH:29][CH:30]=[CH:31][C:26]=1[NH:25][C:17](=[O:19])[CH:16]([N:15]1[CH2:14][C:5]2[CH2:4][C:3]3[C:2]([Cl:1])=[CH:11][CH:10]=[CH:9][C:8]=3[O:7][C:6]=2[C:12]1=[O:13])[CH2:20][CH:21]([CH3:22])[CH3:23]

Participants

6

Reactant 3

HCID 104392-AminopyridineHCID 757711-HydroxybenzotriazoleHCID 86660536(S)-2-[(5-chloro-2-formyl-4H-chromen-3-ylmethyl)-methyl-amino]-4-methyl-pentanoic acid

Product 1

HCID 761924692-(8-Chloro-3-oxo-3,9-dihydro-1H-chromeno[2,3-c]pyrrol-2-yl)-4-methyl-pentanoic acid pyridin-2-ylamideYield 220.1%

Reagents, catalysts & solvents 2

HCID 962WaterSolventHCID 6344DichloromethaneSolvent

Procedure

A solution of (S)-2-[(5-chloro-2-formyl-4H-chromen-3-ylmethyl)-methyl-amino]-4-methyl-pentanoic acid (300 mg, 2.1 mmol), commercially available 2-aminopyridine (101 mg, 1.07 mmol), N-ethyl-N-dimethyaminopropyl carbodiimide hydrochloride (EDCI. HCl) (190 mg, 0.98 mmol), and N-hydroxybenzotriazole (HOBt) (132 mg, 0.982 mmol) in methylene chloride (15 mL) was stirred for 16 hours at 25° C. The reaction mixture was diluted with water and extracted with ethyl acetate (3×). The combined organic layers were dried over anhydrous sodium sulfate and concentrated in vacuo. The resulting residue, upon silica gel flash chromatography using hexane-ethyl acetate gradiant elution, to afford S)-2-(8-Chloro-3-oxo-3,9-dihydro-1H-chromeno[2,3-c]pyrrol-2-yl)-4-methyl-pentanoic acid pyridin-2-ylamide (970 mg, 26.4%), as a white solid. 1H NMR (DMSO-d6) δ: 10.89 (s, 1H), 8.34 (d, J=3.9 Hz, 1H), 8.01 (d, J=7.8 Hz, 1H), 7.77 (t, J=7.3 Hz, 1H), 7.21-7.42 (m, 2H), 7.02-7.17 (m, 2H), 5.07 (d, J=4.9 Hz, 1H), 4.44 (d, J=18.6 Hz, 1H), 4.07 (d, J=18.6 Hz, 1H), 3.75 (s, 2H), 1.75-1.90 (m, 1H), 1.61-1.74 (m, 1H), 1.46 (br. s., 1H), 1.24 (s, 1H), 0.93 (t, J=5.9 Hz, 6H).

Workup

  1. extractionextracted with ethyl acetate (3×)
  2. dry with materialThe combined organic layers were dried over anhydrous sodium sulfate
  3. concentrationconcentrated in vacuo
  4. washhexane-ethyl acetate gradiant elution

Sources & evidence

ORD record
ord-7712801b28cd4ddeb995ecf8eb50c164
Source dataset
uspto-grants-2012_05
Patent number
US08178689B2

Reaction notes

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