Water → (3aS,4R,6aR)-2-benzyloctahydrocyclopenta[c]pyrrol-4-amine

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Triphenylphosphine (4.49 g, 17.13 mmol) and water (1.234 mL, 68.5 mmol) were added successively to a mixture of (3aS,4R,6aR)-4-azido-2-benzyloctahydrocyclopenta[c]pyrrole (1.384 g, 5.71 mmol) in tetrahydrofuran (30 mL). The reaction was refluxed at 80° C. for 2 hours. The crude material was adsorbed onto silica gel and applied to a silica gel cartridge (Analogix®, Burlington, Wis., RS-40) and eluted with 1-10% methanol (2 N ammonia)/chloroform to give (3aS,4R,6aR)-2-benzyloctahydrocyclopenta[c]pyrrol-4-amine: 1H NMR (500 MHz, pyridine-d5) δ ppm 7.45 (d, J=7.4, 2H), 7.38 (t, J=7.5, 2H), 7.29 (t, J=7.3, 1H), 3.52 (s, 2H), 3.14 (dd, J=5.7, 10.7, 1H), 2.62-2.55 (m, 1H), 2.52 (dd, J=3.2, 9.0, 1H), 2.38-2.29 (m, 3H), 2.20-2.13 (m, 1H), 2.01-1.84 (m, 2H), 1.40-1.29 (m, 2H).

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