Acrylonitrile → 3-(5'-bromo-2'-oxospiro[1,3-dioxane-2,3'-indol]-1'(2'H)-yl)propanenitrile

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At room temperature, to a solution of 5′-bromospiro[1,3-dioxane-2,3′-indol]-2′(1′H)-one (2.50 g, 8.80 mmol) in N,N dimethylformamide (39 mL) was added benzyltrimethylammonium hydroxide (40% aq. solution, 0.347 mL, 0.88 mmol, 0.1 mole % ) followed by the dropwise addition of acrylonitrile (1.16 mL, 17.6 mmol, 2 eq). The reaction mixture was heated at 52° C. for 2 hr., cooled to room temperature, quenched with H2O (400 mL) and extracted with Et2O (3×). The combined organic extracts were dried 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 (2.11 g, 71% ). NMR (300 Mz, DMSO-d6): consistent; MS: (API-ES+) m/z 361 [M+Na].

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