An Efficient One-Pot Synthesis of 1,4-Diacyl-2,3,5,6-tetramethoxybenzenes via Biscuprated Precursors
作者:Gerhard Bringmann、Torsten Geuder、Sven Harmsen
DOI:10.1055/s-1994-25658
日期:——
The efficient double acylation of 1,2,4,5-tetramethoxybenzene via the corresponding dicopper species is described; this reaction could not be attained either via the corresponding dilithium salts, or by Friedel-Crafts reaction. According to our method, the hitherto unknown diketones 1a and 1b are obtained in only one step in good yields. Further synthetic access to the compound 1a is realized by bismethylation of the corresponding terephthaloyl dichloride 7.
本文描述了通过相应的二铜物种对 1,2,4,5-四甲氧基苯进行高效双酰化的过程;这种反应既无法通过相应的二锂盐实现,也无法通过弗里德尔-卡夫斯反应实现。 根据我们的方法,只需一步就能得到迄今未知的二酮 1a 和 1b,而且收率很高。化合物 1a 的进一步合成是通过相应的对苯二甲酰二氯 7 的双甲基化实现的。