[Br:1][C:2]1[CH:3]=[CH:4][C:5]([CH2:8]OS(C)(=O)=O)=[N:6][CH:7]=1.C(=O)([O-])[O-].[Cs+].[Cs+].[O:20]1[C:24]2([CH2:29][CH2:28][CH2:27][CH2:26][CH2:25]2)[CH2:23][NH:22][C:21]1=[O:30]>C(#N)C.ClCCl>[Br:1][C:2]1[CH:3]=[CH:4][C:5]([CH2:8][N:22]2[CH2:23][C:24]3([CH2:29][CH2:28][CH2:27][CH2:26][CH2:25]3)[O:20][C:21]2=[O:30])=[N:6][CH:7]=1Methanesulfonic acid 5-bromo-pyridin-2-ylmethyl ester (85 mg, 0.319 mmol), cesium carbonate (312 mg, 0.957 mmol) and 1-oxa-3-aza-spiro[4.5]decan-2-one (49.5 mg, 0.319 mmol) were mixed in acetonitrile (2 mL). The reaction mixture was heated at 70° C. for 5 hours and then diluted with dichloromethane (8 mL). The mixture was washed with water (3 mL) and brine (3 mL). The combined organic phase was dried over sodium sulfate and concentrated. The residue was purified on silica gel eluting with 10 to 20% ethyl acetate in hexanes to give the product as an off-white solid (60 mg, 58%). 1H NMR (300 MHz, CDCl3): δ 8.6 (d, 1H), 7.81 (dd, 1H), 7.23 (d, 1H), 4.49 (s, 2H), 3.27 (s, 2H), 1.79 (m, 4H), 1.47 (m, 6H).
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