Sodium Nitrite → N-(4-chloro-3-hydrazinylbenzyl)-2,2,2-trifluoroacetamide

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To a cold solution of N-(3-amino-4-chlorobenzyl)-2,2,2-trifluoroacetamide (0.500 g, 0.017 mmol) in 6N HCl (50.0 mL), aqueous solution of NaNO2 (1.29 g, 0.018 mmol) was added at 0° C. and the reaction mass was stirred at 0-5° C. for 30 min. The reaction mass was added to a solution of SnCl2.H2O (22.18 g, 0.98 mmol) in 6N HCl at 0-5° C. and further continued stirring for 5-6 h at same temperature. The reaction mass was cooled, basified and extracted with DCM. The organic layer was separated, dried and concentrated to afford 0.700 g of the desired product. 1H NMR (300 MHz, DMSO d6): δ 4.22 (br s, 2H), 4.29 (d, J=6.0 Hz, 2H), 6.42-6.67 (m, 2H), 7.14-7.16 (m, 2H), 9.98 (br s, 1H).

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