4-(3-Fluoro-phenoxymethyl)-pyrroline-1,2-dicarboxylic acid di-tert-butyl ester → (2S,4S)-4-(3-fluoro-phenoxymethyl)-pyrrolidine-2-carboxylic acid

Participants

Reaction Conditions

Reaction Steps

4-(3-fluoro-phenoxymethyl)-pyrroline-1,2-dicarboxylic acid di-tert-butyl ester (Preparation 5, 475 mg, 1.2 mmol) was dissolved in a solution of anhydrous hydrogen chloride in dioxane (4M, 15 ml) and stirred at 50° C. under a nitrogen atmosphere for 1 hour. The solvent was removed under reduced pressure and the resulting semi-solid triturated with ethyl acetate to give a white solid which was recrystallised from ethyl acetate/isopropyl alcohol to give the title compound as a mixture of diastereomers (˜5:1 2S,4S:2S,4R) as a white solid hydrochloride salt (90 mg, 35%)

Provenance & Evidence