Triethylamine → Oxothien-2-yl-acetic Acid 1-azabicyclo[2.2.2]oct-4-yl Ester

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Reaction Steps

Oxalyl chloride (1.5 ml, 0.017 mol) was added to a solution of oxothien-2-yl-acetic acid (2.24 g, 0.014 mol) and dimethylformamide (one drop) in 30 ml of chloroform (etanol free) at 01 C. The mixture was stirred and allowed to warm at room temperature. After one hour the solvent was evaporated. The residue was dissolved in chloroform and evaporated again. This procedure was repeated two times. The product obtained was disolved in CHCl3 (30 ml) and added to a suspension of 1.1 g (0.009 mols) of 4-hydroxy-1-azabicyclo[2.2.2]octane, 1.8 ml of triethylamine (0.013 mols), 0.6 g (0.9 mmols) of N-(methylpolystyrene)-4-(methylamino) pyridine at 70° C. The mixture was refluxed for 1 hour, cooled, filtered and washed with water. The title product was extracted with a solution of diluted HCl, washed with CHCl3, basified with K2CO3 and extracted again with CHCl3. After removal of the solvent 1.47 g (45%) of a solid was obtained. 1H-NMR (dmso): δ 2.0 (m, 6H), 2.9 (m, 6H), 7.35 (m, 1H), 8.05 (m, 1H), 8.3 (m, 1H).

Provenance & Evidence