[N+:1]([C:4]1[CH:5]=[C:6]2[C:10](=[CH:11][CH:12]=1)[NH:9][C:8](=[O:13])[C:7]12[O:18][CH2:17][CH2:16][CH2:15][O:14]1)([O-:3])=[O:2].[C:19](#[N:22])[CH:20]=[CH2:21].O>CN(C=O)C.[OH-].C([N+](C)(C)C)C1C=CC=CC=1>[N+:1]([C:4]1[CH:5]=[C:6]2[C:10](=[CH:11][CH:12]=1)[N:9]([CH2:21][CH2:20][C:19]#[N:22])[C:8](=[O:13])[C:7]12[O:18][CH2:17][CH2:16][CH2:15][O:14]1)([O-:3])=[O:2]
At room temperature, to a mixture of 5′-nitrospiro[1,3-dioxane-2,3′-indol]-2′(1′H)-one(1.75 g, 6.99 mmol) and benzyltrimethylammonium hydroxide (40% aqueous solution, 0.110 mL, 0.699 mmol, 0.1 mole %) in DMF (31 mL) was added acrylonitrile (0.921 mL, 14.0 mmol, 2 eq) drop-wise. and the mixture was heated at 52° C. for 2 hr. The reaction was cooled to room temperature and poured into H2O (160 mL). The reaction mixture was extracted with Et2O. The combined organic extracts were washed with brine and concentrated. The crude product was purified on Biotage KP silica gel eluting with 96/4 CH2Cl2/CH3CN to give the title compound as a yellow solid (2.15 g, 100% ). NMR (300 Mz, DMSO-d6): consistent
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