Cyclopropylamine → 4-[(S)-3-tert-Butoxycarbonylaminopyrrolidin-1-yl]-2-cyclopropylamino-3,5,6-trifluorobenzoic acid benzyl ester

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A solution of 4-[(S)-3-(tert-butoxycarbonylamino)pyrrolidin-1-yl]-2,3,5,6-tetrafluorobenzoic acid benzyl ester (Example 2d, 2.5 g, 5.3 mmol), cyclopropylamine (40 mL, 577 mmol), and dimethyl sulfoxide (20 mL) in a sealed glass tube is heated at 80° C. for 24 hours. The excess amine is removed by blowing in compressed air, and the solution is then concentrated under high vacuum. The residue is purified by column chromatography (1:1:7 ethyl acetate/chloroform/hexanes) to afford the title compound as a solid (2.31 g). 1H NMR (CDCl3): δ 7.47–7.27 (m, 5H), 7.12 (bs, 1H), 5.30 (s, 2H), 4.78–4.62 (m, 1H), 4.35–4.17 (m, 1H), 3.96–3.56 (m, 3H), 3.54–3.39 (m, 1H), 2.91–2.73 (m, 1H), 2.24–2.02 (m, 1H), 1.96–1.77 (m, 1H), 1.45 (s, 9H), 0.69–0.56 (m, 2H), 0.53–0.40 (m, 2H).

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