クマリン誘導体の合成研究 (第1報)
クマリン-3-カルボン酸及び6-ニトロクマリン-3-カルボン酸誘導体の合成 その1
1952 年 72 巻 7 号 p. 876-877
詳細
1952 年 72 巻 7 号 p. 876-877
Following compounds were synthesized as the derivatives of coumarin- and 6-nitro-coumarin-3-carboxylic acids: Butyl coumarin-3-carboxylate, m.p. 66-66.5°; butyl 6-nitrocoumarin-3-carboxylate, m.p. 153-154°; isoamyl 6-nitrocoumarin-3-carboxylate, m.p. 153-153.5°; coumarin-3-carboxylic urea, m.p. 255-255.5°; 6-nitrocoumarin-3-carboxylicurea, m.p. 243.5°. It was found, during this experiment, that the preparation of coumarin-3-carboxylic acid from salicylaldehyde by the Knoevenagel reaction gave better results when a solvent (alcohol) was not used.
