Hydrochloric Acid → (+/-)-2'-Oxo-3,4-dihydro-1H-spiro[naphthalene-2,3'-pyrrolidine]-6-carboxylic acid

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Reaction Steps

A stirred solution of (±)-methyl 2′-oxo-3,4-dihydro-1H-spiro[naphthalene-2,3′-pyrrolidine]-6-carboxylate from Step F (50 mg, 0.193 mmol) and lithium hydroxide (24 mg, 0.578 mmol) in THF (3 mL) and H2O (1 mL) was heated at reflux for 5 h, then allowed to cool. The mixture was poured into 10% aqueous HCl (10 mL) and extracted with EtOAc (3×20 mL), and the combined organic extracts were dried over Na2SO4, filtered, and concentrated in vacuo. The residue was triturated with CH2Cl2 to give the title compound. MS: m/z=246 (M+1).

Provenance & Evidence