Diisopropylethylamine → tert-Butyl (1R,3S,4S,6R)-3-{[(2S)-2-aminocarbonyl-1-pyrrolidinyl]carbonyl}-6-hydroxy-2-azabicyclo[2.2.1]heptane-2-carboxylate

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Reaction Steps

To a suspension of (1R,3S,4S,6R)-2-(tert-butoxycarbonyl)-6-hydroxy-2-azabicyclo[2.2.1]heptane-3-carboxylic acid obtained in Example 42-6 (45 g) in chloroform (450 mL), were added (2S)-2-pyrrolidinecarboxamide (21 g), 1-hydroxybenzotriazole hydrate (29.5 g), 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (36.9 g) and diisopropylethylamine (45.3 g) in water bath. The mixture was stirred at room temperature for 5 hrs. The precipitate collected by vacuum filtration and washed with ethyl acetate to give the target compound as a solid (51.5 g).

Provenance & Evidence