4-Chloroaniline → Ethyl 2-chloro-2-(2-(4-chlorophenyl)hydrazono)acetate

関与物質

反応条件

反応手順

Part A: To a stirred solution of 4-chloroaniline (15.68 gram, 0.123 mol) in ice (30 ml) and concentrated hydrochloric acid (30 ml) is slowly added a solution of NaNO2 (9.0 gram, 0.13 mol) in water (16 ml) and the resulting solution is stirred for 1Hour at 0-5° C. and subsequently added to a cold mixture of NaOAc (32 gram, 0.39 mol), ethanol (520 ml) and ethyl 2-chloro-3-oxobutanoate (16.6 ml, 0.12 mol). After stirring the resulting mixture for 1 hour the formed precipitate is collected by filtration, washed with ethanol and dried in vacuo to give ethyl 2-chloro[(4-chlorophenyl)hydrazono]acetate (22.99 gram, 73% yield). Melting point: 147.5-149.5° C. 1H-NMR (200 MHz, CDCl3): 1.40 (t, J=7 Hz, 3H), 4.39 (q, J=7 Hz, 2H), 7.16 (br d, J=8 Hz, 2H), 7.30 (br d, J=8 Hz, 2H), 8.31 (br s, 1H).

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