Tetrahydrofuran → HCID 69451615, compound

Participants

Reaction Conditions

Reaction Steps

In an oven-dried, 25-mL, round-bottomed flask was placed 2-(4-pyridyl)-thiazole acetic acid methyl ester (Example 1a, 380 mg, 1.62 mmol) in THF (10 mL). The mixture was cooled to −78° C. and LHMDS (Aldrich, 1.0 M in THF, 1.62 mL) was added slowly. The reaction was stirred for 5 min, and the resulting enolate was added to a pre-cooled (−45° C.) solution of 2-bromomethyl-3-nitro-benzoic acid methyl ester in THF (10 mL) via a cannula over a period of 5 min. The reaction was stirred for additional 1.5 h, and quenched by saturated aq. NH4Cl (5 mL). The phases were separated, and the aqueous phase was extracted with EtOAc (50 mL). The combined organic layers were washed with brine (15 mL), dried over MgSO4, and concentrated in vacuo to afford the crude addition product. This material was employed in the next step without further purification. In a 50-mL, round-bottomed flask were placed the crude addition product, Fe powder (Aldrich, 454 mg, 8.0 mmol), and NH4Cl (70 mg, 1.3 mmol) in H2O (8 mL) and EtOH (8 mL). The mixture was heated at 80° C. for 12 h, and filtered while hot. The filtrate was concentrated in vacuo, and purified by flash chromatography (EtOAc) to afford 1,2,3,4-tetrahydro-2-oxo-3-[2-(4-pyridyl)-4-thiazolyl]-5-quinolinecarboxylic acid methyl ester as a yellow solid. Mp: 230-231° C. MS m/z: 366 (M+1). Calc'd for C19H15N3O3S: 365.08.

Provenance & Evidence