Cl.[CH2:2]1[C:4]2([CH2:9][CH2:8][CH2:7][CH2:6][NH:5]2)[CH2:3]1.N1C=CC=CC=1.CCN(C(C)C)C(C)C.[Cl:25][C:26](Cl)([O:28]C(=O)OC(Cl)(Cl)Cl)Cl.Cl>C(Cl)Cl>[CH2:3]1[C:4]2([CH2:9][CH2:8][CH2:7][CH2:6][N:5]2[C:26]([Cl:25])=[O:28])[CH2:2]1
To a vigorously stirred pale yellow solution of 4-azaspiro[2.5]octane hydrochloride (ABCR, 443 mg, 3.00 mmol), pyridine (0.36 mL, 4.5 mmol) and DIPEA (0.52 mL, 3.0 mmol) in DCM (10 mL) at 0° C. was added a solution of triphosgene (594 mg, 2.00 mmol) in DCM (5 mL) dropwise over 5 min. The resulting orange solution was stirred at 0° C. for 30 min, and at RT for 66 h. Aq. HCl solution (1M, 15 mL) was added and the mixture stirred for 30 min. The aqueous was extracted with DCM (4×15 mL), then the combined organics passed through a hydrophobic frit and concentrated in vacuo to leave the title compound as a red-brown oil (100% yield). 1H NMR (300 MHz, CDCl3): ˜2:1 ratio of rotamers, 0.71-0.76 (1.33H, m), 0.82 (0.67H, br s), 1.00-1.04 (1.33H, m), 1.09 (0.67H, br s), 1.53-1.59 (2H, m), 1.64-1.72 (2H, m), 1.75-1.83 (2H, m), 3.61-3.74 (2H, m).
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