在我们关于传染病的工作过程中,我们被引导准备了6-溴-2-氯-4-甲基喹啉作为起始原料。由于文献中出人意料的报道很少,因此对该化合物的两个合成步骤进行了研究。该合成涉及β-酮酸酯和4-溴苯胺之间的缩合,以及将所得的苯胺环化成6-溴喹啉-2(1 H)-一,也称为克诺尔反应。该¹第一步的1 H NMR监测使我们能够优化导致苯胺的条件,而不会出现替代的巴豆酸酯。为了说明我们的发现的范围,制备了一些具有电子吸引基团的额外的酸酐。对它们环化的研究表明,这第二步支配着一些意想不到的空间效应。除了纠正该化学中的一些说法外,该研究还导致了三步制备6-溴-2-氯-4-甲基喹啉的步骤,而4-溴苯胺的总收率为48%。 酰化-环化-杂环-喹啉-碳正离子化
在我们关于传染病的工作过程中,我们被引导准备了6-溴-2-氯-4-甲基喹啉作为起始原料。由于文献中出人意料的报道很少,因此对该化合物的两个合成步骤进行了研究。该合成涉及β-酮酸酯和4-溴苯胺之间的缩合,以及将所得的苯胺环化成6-溴喹啉-2(1 H)-一,也称为克诺尔反应。该¹第一步的1 H NMR监测使我们能够优化导致苯胺的条件,而不会出现替代的巴豆酸酯。为了说明我们的发现的范围,制备了一些具有电子吸引基团的额外的酸酐。对它们环化的研究表明,这第二步支配着一些意想不到的空间效应。除了纠正该化学中的一些说法外,该研究还导致了三步制备6-溴-2-氯-4-甲基喹啉的步骤,而4-溴苯胺的总收率为48%。 酰化-环化-杂环-喹啉-碳正离子化
A series of novel phenothiazinyldihydropyridine dicarboxamides7a–7jwas synthesized by adopting a multi-step synthetic strategy and characterized through physical and spectral techniques.
standard diclofenac sodium. A hybrid integrated with a para-fluorophenyl carboxamide moiety (28) showed the highest DPPH radical scavenging activity among the chemical entities synthesized. Furthermore, the results of anticancer evaluations implied that the hybrid tethered with a phenyl carboxamide structural unit (29) exerted superior activity when compared with other hybrids against the pancreatic cancer
To develop novel antibacterial agents, 2-sulfoether-4-quinolone scaffolds were synthesized by a freeradical process and evaluated for their antibacterial abilities. Excellent activities against Gram-positive bacteria were observed, among which compounds 3m, 3n, 3p and 3t possessed the lowest MICs against both S. aureus and B. cereus (0.8 μM and 1.61 μM, respectively). The structure-activity relationship
Abstract A gold(I)-catalyzed three-component reaction of β-nitrostyrenes with 1,3-dicarbonyl compounds and primary amines to form polysubstituted pyrroles has been developed at room temperature in ethanol. The key advantages of the three-component reaction are the mild reaction conditions and environmentally safer solvent.
Pd‐Catalyzed Carbonylative Synthesis of 4
<i>H</i>
‐Benzo[
<i>d</i>
][1,3]Oxazin‐4‐Ones Using Benzene‐1,3,5‐Triyl Triformate as the CO Source
作者:Yan Zheng、Mengke Dong、Erdong Qu、Jin Bai、Xiao‐Feng Wu、Wanfang Li
DOI:10.1002/chem.202103137
日期:2021.11.22
A Pd-catalyzed CO-free carbonylative synthesis of 4H-benzo[d][1,3]oxazin-4-one derivatives was developed. This new method employed readily available N-(o-bromoaryl)amides as the starting materials and inexpensive benzene-1,3,5-triyl triformate (TFBen) as the stable solid CO surrogate, which would not cause hydrodehalogenation of the starting materials. Remarkably, this method featured a very broad
开发了 Pd 催化的 4 H -benzo[ d ][1,3]oxazin-4-one 衍生物的无 CO 羰基化合成。这种新方法使用容易获得的N -(邻溴芳基)酰胺作为起始原料,使用廉价的三甲酸苯-1,3,5-三酯(TFBen)作为稳定的固体 CO 替代物,不会引起起始原料的加氢脱卤。值得注意的是,该方法具有非常广泛的底物范围,特别适用于将苯并[ d ][1,3]oxazin-4-one结构引入药物和天然生物活性化合物中。