化学学报 ›› 1962, Vol. 28 ›› Issue (3): 155-159. 上一篇    下一篇

论文

4-脱氧吡哆醇的新合成法

李述文, 高怡生   

  1. 中国科学院药物研究所
  • 修回日期:1961-11-22 发布日期:2013-06-03

A NEW SYNTHESIS OF 4-DEOXYPYRIDOXINE

LI SHU-WEN, KAO YEE-SHENG   

  1. Institule of Materia Medica, Academia Sinica
  • Revised:1961-11-22 Published:2013-06-03

1.本文叙述以邻-硝基乙苯为原料、合成4-脱氧吡哆醇,后者是一种常用的维生素B6的对抗剂。2.2,4-二甲基-3-乙氧基喹啉盐酸盐(Ⅳ)的苯环上不引入氨基,直接氧化,也可得到2,4-二甲基-3-乙氧基吡啶-5,6-二羧酸(Ⅶ)。

4-Deoxypyridoxine (Ⅰ) is an effective antagonist of pyridoxine, and also a biochemical reagent.It possesses antitumour effect in pyridoxine-deficient animals.In this investigation a new route for the synthesis of Ⅰ has been described.The starting material is o-aminoacetophenone (Ⅱ), which in turn is obtained from o-nitroethylbenzenc,a by-product in the production of certain drugs.Ⅱ condenses with bromoacetonc in dilute alcohol in the presence of potassium hydroxide to give 2,4-dimethyl-3-hydroxyquinoline (Ⅲ).The latter is ethylated with ethyl iodide to afford 2,4-dimethyl-3-ethoxyquinolinc hydrochloride (Ⅳ), which is then converted to 2,4-dimethyl-3-ethoxypyridine-5,6-dicar-boxylic acid (Ⅷ) via two routes:(1) Ⅳ is oxidized directly with potassium permanganate in aqueous potassium carbonate solution, and (2) Ⅳ is converted to a nitro deriva-five (Ⅴ), then catalytically hydrogenated to an amino compound and finally oxidized to Ⅶ by potassium permanganate.VII is decarboxylated and then estcriEied with diazomc-thane to give the corresponding methyl ester (Ⅸ).Upon reduction with lithium aluminium hydride the ester is converted to 2,4-dimethyl-3-ethoxy-5-hydroxymethylpyridinc hydrochloride (Ⅹ) which upon treating with dilute hydrochloric acid in a sealed tube at 200-205°, yields the desired product (Ⅰ).