反应详情

温度

0 °C

Aqueous hydrochloric acid (6 M, 8.3 mL) was added slowly to a mixture of zinc dust (4.9 g) and (2,6-dimethyl-4-nitro-phenyl)-carbamic acid propyl ester (1.26 g) in tetrahydrofuran (50 mL) cooled to 0° C. The reaction mixture was then stirred for 5 hours at 25° C., and the pH adjusted to 10 with 25% aqueous ammonia. The product was extracted with ethyl acetate (3×50 mL), the combined organic phases were dried over magnesium sulfate and concentrated in vacuo to furnish 1.1 g (99% yield) of the title compound as a dark oil. The crude product was used without further purification. 1H NMR (500 MHz, DMSO-d6): 0.91 (t, 3H), 1.60 (m, 2H), 1.99 (s, 6H), 3.95 (t, 2H), 4.82 (s, 2H), 6.23 (s, 2H), 8.14 (s, 1H).

1. extractionThe product was extracted with ethyl acetate (3×50 mL)
2. dry with materialthe combined organic phases were dried over magnesium sulfate
3. concentrationconcentrated in vacuo