反应详情

温度

50 °C

4-(3-fluoro-phenoxymethyl)-pyrroline-1,2-dicarboxylic acid di-tert-butyl ester (Preparation 44, 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%)

1. customThe solvent was removed under reduced pressure
2. customthe resulting semi-solid triturated with ethyl acetate
3. customto give a white solid which
4. customwas recrystallised from ethyl acetate/isopropyl alcohol