2-Aminopyridine → 3-cyclopentyl-2-(4-nitro-phenyl)-N-pyridin-2-yl-propionamide

HRID 398646Notes

Reaction equation

[CH:1]1([CH2:6][CH:7]([C:11]2[CH:16]=[CH:15][C:14]([N+:17]([O-:19])=[O:18])=[CH:13][CH:12]=2)[C:8]([OH:10])=O)[CH2:5][CH2:4][CH2:3][CH2:2]1.C(Cl)(=O)C(Cl)=O.[NH2:26][C:27]1[CH:32]=[CH:31][CH:30]=[CH:29][N:28]=1.C(N(CC)C(C)C)(C)C>C(Cl)Cl.CN(C)C=O.O1CCCC1>[CH:1]1([CH2:6][CH:7]([C:11]2[CH:16]=[CH:15][C:14]([N+:17]([O-:19])=[O:18])=[CH:13][CH:12]=2)[C:8]([NH:26][C:27]2[CH:32]=[CH:31][CH:30]=[CH:29][N:28]=2)=[O:10])[CH2:2][CH2:3][CH2:4][CH2:5]1

Participants

Conditions

Temperature: 25 °C

Procedure

A solution of 3-cyclopentyl-2-(4-nitro-phenyl)-propionic acid (prepared as in Example 22A, 263 mg, 1.0 mmol) in methylene chloride (10 mL) cooled to 0° C. was treated with a 2.0M solution of oxalyl chloride in methylene chloride (0.6 mL, 1.2 mmol) and a few drops of N,N-dimethylformamide. The reaction mixture was stirred at 0° C. for 15 min and at 25° C. for 30 min. The reaction mixture was then treated with a solution of 2-aminopyridine (200.6 mg, 2.14 mmol) in tetrahydrofuran (5 mL) and N,N-diisopropylethylamine (0.42 mL, 2.4 mmol). This solution was stirred at 25° C. for 48 h. At this time, the reaction was concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 80/20 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4-nitro-phenyl)-N-pyridin-2-yl-propionamide (138.6 mg, 40.9%) as a pale yellow glass: EI-HRMS m/e calcd for C19H21N3O3 (M+) 339.1581, found 339.1582.

Workup

stirringThis solution was stirred at 25° C. for 48 h
concentrationAt this time, the reaction was concentrated in vacuo

Sources & evidence

ORD record: ord-c9382fe72e394bcca09bdd55d0546ef1
Source dataset: uspto-grants-2003_08
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US06610846B1

Reaction notes

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