The Synthesis of Nitro, Amino, and Acetamino Derivatives of 2,3-Dimethylbenzofuran
作者:Yoshiyuki Kawase、Setsuko Takata、Etsuko Hikishima
DOI:10.1246/bcsj.44.749
日期:1971.3
Another route to the synthesis of nitro, amino, and acetamino derivatives of 2,3-dimethylbenzofuran was explored. The cyclo-dehydration of 3-(m- and p-nitrophenoxy)butanones by means of polyphosphoric acid or sulfuric acid afforded 2,3-dimethyl-4- and -5-nitrobenzofurans, which were then converted by reduction to the corresponding 4- and 5-aminobenzofurans. The 4-, 5-, 6-, and 7-aminobenzofurans were
探索了另一种合成 2,3-二甲基苯并呋喃的硝基、氨基和乙酰氨基衍生物的途径。3-(间-和对-硝基苯氧基)丁酮通过多磷酸或硫酸环脱水得到 2,3-二甲基-4-和-5-硝基苯并呋喃,然后通过还原转化为相应的 4-和 5-氨基苯并呋喃。4-、5-、6-和7-氨基苯并呋喃是通过相应羧酸酰胺的霍夫曼反应制备的。如此获得的胺通过乙酰化作用转化为4-、5-和6-乙酰氨基苯并呋喃。5-、6- 和 7-乙酰氨基苯并呋喃也可通过 3-(对-、间-和邻-乙酰氨基苯氧基)丁酮的环化反应制备。7-硝基苯并呋喃是通过7-氨基苯并呋喃的Sandmeyer反应制备的。四种芳氧基丁酮、2,3-二甲基-4-和-7-硝基苯并呋喃、4-氨基-2、