Sodium borohydride → 2-(7-Fluoro-2,3-dihydrobenzo[b][1,4]dioxin-5-yl)pyrrolidine

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NaBH4 (0.25 g, 6.69 mmol) was added to a solution of 5-(7-fluoro-2,3-dihydrobenzo[b][1,4]dioxin-5-yl)-3,4-dihydro-2H-pyrrole (0.8 g, 3.34 mmol) in a mixture of MeOH and H2O (3:1, 20 mL) and was stirred at 25° C. for 2 h. Reaction mixture was quenched with 1N aqueous HCl solution (50 mL) and basified with 2N aqueous NaOH solution to pH 8 and extracted with DCM (3×20 mL). The organic layer was dried over anhydrous sodium sulphate and concentrated under reduced pressure to afford 2-(7-fluoro-2,3-dihydrobenzo[b][1,4]dioxin-5-yl)pyrrolidine (Int-31). (0.7 g, 94% yield). MS (ESI): m/z 224.5 (M+H).

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