2-Aminothiazole → (S)-2-(8-chloro-3-oxo-3,9-dihydro-1H-chromeno[2,3-c]pyrrol-2-yl)-4-methyl-pentanoic acid thiazol-2-yl-amide

HRID 1925888Notes

Reaction equation

HRID 1925888 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[S:27][CH:28]=[CH:29][N:30]=1.ON1C2C=CC=CC=2N=N1>C(Cl)Cl.O>[S:27]1[CH:28]=[CH:29][N:30]=[C:26]1[NH:25][C:17](=[O:19])[C@@H: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 21552-AminothiazoleHCID 757711-HydroxybenzotriazoleHCID 86660536(S)-2-[(5-chloro-2-formyl-4H-chromen-3-ylmethyl)-methyl-amino]-4-methyl-pentanoic acid

Product 1

HCID 54767635(S)-2-(8-chloro-3-oxo-3,9-dihydro-1H-chromeno[2,3-c]pyrrol-2-yl)-4-methyl-pentanoic acid thiazol-2-yl-amideYield 53%

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) (Example 3, Step 1c), commercially available 2-aminothiazole (109 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 gradient elution, afforded (S)-2-(8-chloro-3-oxo-3,9-dihydro-1H-chromeno[2,3-c]pyrrol-2-yl)-4-methyl-pentanoic acid thiazol-2-yl-amide (200 mg, 53%), as a light yellow solid. 1H NMR (DMSO-d6) δ: 12.58 (br. s., 1H), 7.50 (d, J=3.4 Hz, 1H), 7.19-7.36 (m, 3H), 7.09 (dd, J=7.1, 2.2 Hz, 1H), 5.05 (dd, J=10.8, 4.9 Hz, 1H), 4.40 (d, J=19.1 Hz, 1H), 4.09 (d, J=18.6 Hz, 1H), 3.76 (br. s., 2H), 1.78-1.92 (m, 1H), 1.63-1.76 (m, 1H), 1.46 (br. s., 1H), 0.93 (t, J=7.1 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 gradient elution

Sources & evidence

ORD record
ord-35cd0c736c78499e877110ee33983a08
Source dataset
uspto-grants-2012_05
Patent number
US08178689B2

Reaction notes

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