[CH2:1]([N:8]1[CH2:12][C@@H:11]2[C@@H:13](CS([O-])(=O)=O)[CH2:14][CH2:15][C@H:10]2[CH2:9]1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[N-:21]=[N+:22]=[N-:23].[Na+]>CN(C)C(=O)C.C(OCC)(=O)C>[N:21]([C@H:13]1[C@H:11]2[C@H:10]([CH2:9][N:8]([CH2:1][C:2]3[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=3)[CH2:12]2)[CH2:15][CH2:14]1)=[N+:22]=[N-:23](3aS,4S,6aR)-2-Benzyloctahydrocyclopenta[c]pyrrol-4-yl methanesulfonate (1.686 g, 5.71 mmol) from Step C and sodium azide (0.557 g, 8.56 mmol) were combined in N,N-dimethylacetamide (10 mL). The reaction was heated at 90° C. for 15 hours. The reaction was cooled and diluted with 200 mL of ethyl acetate and then quenched with 30 mL water. The organic layer was removed and washed with 2×20 mL of water, then 20 mL of brine. The solvent was removed in vacuo to give (3aS,4R,6aR)-4-azido-2-benzyloctahydrocyclopenta[c]pyrrole: 1H NMR (300 MHz, CDCl3) δ ppm 7.36-7.27 (m, 4H), 7.22 (dd, J=2.9, 5.8, 1H), 3.72-3.61 (m, 1H), 3.54 (s, 2H), 2.76-2.60 (m, 1H), 2.55-2.40 (m, 4H), 2.35 (dd, J=3.5, 9.1, 1H), 2.07-1.86 (m, 2H), 1.72-1.60 (m, 1H), 1.49-1.38 (m, 1H).
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