Methyl 4,4-dimethyl-2-oxocyclopentane-1-carboxylate → HCID 178423155, compound

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Reaction Steps

A solution of 4,4-Dimethyl-2-oxo-cyclopentanecarboxylic acid methyl ester (2.08 g, 12.21 mmol) and 5-Chloro-2-fluoro-benzamidine (2.32 g, 13.44 mmol) in 100% ethanol (40 mL) was heated to reflux overnight, then cooled and evaporated. The residue was dissolved in 1N (aq.) NaOH (50 mL) and washed with methylene chloride (2×50 mL). The aqueous layer was then acidified with glacial acetic acid to pH4 and extracted with methylene chloride (2×100 mL). The organic extracts were dried (brine and MgSO4) and evaporated to give crude product, purified by chromatography (CH2Cl2, 0-10% MeOH) to give the desired product as a cream solid (2.10 g, 59% yield).

Provenance & Evidence