Synthesis of 2-(substituted methyl)quinolin-8-ols and their complexation with Sn(II)
作者:Chitoshi Kitamura、Naoyuki Maeda、Noboru Kamada、Mikio Ouchi、Akio Yoneda
DOI:10.1039/a908636f
日期:——
A new method for the synthesis of 2-(substituted methyl)quinolin-8-ol is described. 2-Methyl-8-methoxyquinoline 3 was prepared as a key building block; lithiation of 3 with LDA and subsequent addition of alkyl halides followed by reaction in 48% HBr afforded the 2-alkylquinolin-8-ols 6a,b. On the other hand, the use of alkanediyl dihalides as the electrophile gave bis(quinolin-8-ol) derivatives containing an alkyl bridge 12. The complexation of 2-alkyl-8-hydroxyquinolines with SnCl2 in alkaline methanol produced the bis(quinolin-8-ol) complexes 13a,b, whereas in the case of the bis(quinolin-8-ol) derivatives, intractable solids were obtained. The molecular structure of 13b was elucidated by X-ray analysis.
本文介绍了一种合成 2-(取代甲基)喹啉-8-醇的新方法。以 2-甲基-8-甲氧基喹啉 3 为关键结构单元进行制备;用 LDA 对 3 进行石化,然后加入烷基卤化物,在 48% HBr 中进行反应,得到 2-烷基喹啉-8-醇 6a、b。另一方面,使用烷二基二卤化物作为亲电子体,可以得到含有烷基桥 12 的双(喹啉-8-醇)衍生物。2- 烷基-8-羟基喹啉与 SnCl2 在碱性甲醇中络合生成了双(喹啉-8-醇)络合物 13a、b,而双(喹啉-8-醇)衍生物则生成了难以溶解的固体。通过 X 射线分析阐明了 13b 的分子结构。