2-Aminothiazole → 3-Cyclopentyl-2-(4-nitro-phenyl)-N-thiazol-2-yl-propionamide

HRID 398455Notes

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[S:28][CH:29]=[CH:30][N:31]=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[S:28][CH:29]=[CH:30][N:31]=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 (131 mg, 0.5 mmol) in methylene chloride (5.0 mL) was cooled to 0° C. and then treated with a 2.0M solution of oxalyl chloride in methylene chloride (1.0 mL, 2.0 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-aminothiazole (110 mg, 1.0 mmol) in tetrahydrofuran (5 mL) and N,N-diisopropylethylamine (0.28 mL, 0.55 mmol). The solution was stirred at 25° C. for 24 h. At this time, the reaction was concentrated in vacuo. Flash chromatography (Merck Silica gel 60, 230-400 mesh, 50/50 hexanes/ethyl acetate) afforded 3-cyclopentyl-2-(4-nitro-phenyl)-N-thiazol-2-yl-propionamide (38 mg, 22.4%) as a yellow solid: mp 186-187° C.; EI-HRMS m/e calcd for C17H19N3O3S (M+) 345.1147, found 345.1148.

Workup

stirringThe solution was stirred at 25° C. for 24 h
concentrationAt this time, the reaction was concentrated in vacuo

Sources & evidence

ORD record: ord-2271bf5695ae4e0a809c16abb2d663ea
Source dataset: uspto-grants-2003_08
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US06610846B1

Reaction notes

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