Benzoyl isocyanate → N-(3-cyano-4,5-dimethylthiophen-2-ylcarbamoyl)benzamide

関与物質

反応手順

To a solution of 2-amino-4,5-dimethylthiophene-3-carbonitrile (1680 g, 11.04 mol) in 1,4-dioxane (42 L) was added benzoylisocyanate (1624 g, 11.04 mol). The reaction mixture was then stirred at room temperature under nitrogen overnight. The resulting precipitate was collected by filtration, washed with 1,4-dioxane (3×1.7 l) and heptane (3×1.7 L), and dried under vacuum overnight to give N-(3-Cyano-4,5-dimethylthiophen-2-ylcarbamoyl)benzamide as a white solid (2800 g, 84.7% yield). 1H NMR (400 MHz, DMSO-d6) δ 2.10 (s, 3H), 2.24 (s, 3H), 7.52-7.56 (m, 2H), 7.64-7.69 (m, 1H), 8.01-8.03 (m, 2H), 11.57 (brs, 1H), 12.05 (brs, 1H). MS 300 (MH+).

情報源と証拠