3-ethoxycarbonylmethyl-6-fluoro-5-nitro-2(3H)-benzothiazolone → 5-amino-3-ethoxycarbonylmethyl-6-fluoro-2(3H)-benzothiazolone

関与物質

反応手順

Electrolytic iron powder (0.29 g) was suspended in 5% acetic acid (2 ml), and a solution of 3-ethoxycarbonylmethyl-6-fluoro-5-nitro-2(3H)-benzothiazolone (0.31 g) in acetic acid (1 ml) and ethyl acetate (1 ml) was dropwise added thereto while heating. The resultant mixture was heated under reflux for 3 hours. The reaction mixture was subjected to filtration with celite, and the filtrate was extracted with ethyl acetate. The extract was washed with water and sodium bicarbonate solution, dried and concentrated to give 0.20 g of 5-amino-3-ethoxycarbonylmethyl-6-fluoro-2(3H)-benzothiazolone. m.p., 172.5°-173.5° C.

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