Synthesis and characterization of new (E)-N''-(substituted benzylidene)-2-(3-(2-methyl)-4-oxo-3,4-dihydroquinazolin-2-ylthio)acetohydrazides
作者:Aamer SAEED、Shams-ul MAHMOOD、Ulrich FLÖRKE
DOI:10.3906/kim-1306-20
日期:——
A small library of new azomethine derivatives of 3-aryl-2-thioxo-2,3-dihydroquinazolin-4(1H)-ones was synthesized. The key intermediates 2-thioxo-quinazolinones (3a--e), obtained in 2 steps from the corresponding anilines, were treated with methyl chloroacetate to afford S-substituted esters (4a,d), which were then converted into corresponding acetohydrazides (5a,d). Further, acetohydrazide (5d) was converted to the azomethines derivatives (6a--k) by reacting with a number of suitably substituted benzaldehydes. FTIR, ^1H NMR, ^13}C NMR, GC-MS, and elemental analyses were used to confirm the assigned structures of the synthesized compounds. Further, compounds 3a, 5, and 6j were also confirmed by X-ray diffraction data.
我们合成了一个小型的 3-芳基-2-硫酮-2,3-二氢喹唑啉-4(1H)-酮叠氮甲胺新衍生物库。由相应苯胺分两步得到的关键中间体 2-硫酮-喹唑啉酮(3a--e)经氯乙酸甲酯处理后得到 S-取代酯(4a,d),然后将其转化为相应的乙酰肼(5a,d)。然后,乙酰肼(5d)与一些适当取代的苯甲醛反应,转化为偶氮甲烷衍生物(6a--k)。傅立叶变换红外光谱、^1H NMR、^13}C NMR、气相色谱-质谱和元素分析被用来确认合成化合物的指定结构。此外,化合物 3a、5 和 6j 还得到了 X 射线衍射数据的证实。