共查询到20条相似文献,搜索用时 62 毫秒
1.
2.
3-Formylchrone reacted with aroylhydrazine to give corresponding hydrazone, which wastreated with acetic anhydride to give a series of chromones with substitution of 1, 3,4-dihydrooxadi-azoly in 3-position. The chromone formation reaction could be finished in a much short time by mi-crowave irradiation heating. 相似文献
3.
3-(3-乙酰基-5-芳氧亚甲基-2;3-二氢-1;3;4-噁二唑-2-基)色酮类化合物的合成;噁二唑啉;色酮;合成 相似文献
4.
微波作用下2,5-二取代-1,3,4-噁二唑的合成 总被引:2,自引:0,他引:2
2 ,5 二取代 1 ,3 ,4 二唑可用作药品 ,光敏物质 ,闪烁体 ,激光材料 ,高分子液晶单体等[1- 5] 。一种是以芳香酸与水合肼作为原料用多聚磷酸作为脱水环合剂来合成此类化合物[6 ] ,另一种是由芳香酸转变为芳香酰氯或酯 ,再与水合肼反应得到单酰肼或二酰肼 ,最后用三氯氧磷[7] ,五氧化二磷和五氯化磷[8] ,一氯三甲硅[9] 脱水环合 ;此外 ,用水合肼和尿素合成得到的氨基脲代替水合肼 ,与芳香酸缩合合成二唑[10 ] ,这些方法共同的缺陷是 :环合时间较长 ,少者 4~ 5h ,多则 8h。近年来 ,微波技术在有机合成及其杂环化合物的合成中得到了广… 相似文献
5.
微波催化固相法合成3,4-二氢嘧啶-2(1H)-酮 总被引:2,自引:0,他引:2
在固相无溶剂条件下,使用微波辐射技术,由β-酮酸酯、芳香醛、脲合成了一系列3,4-二氢嘧啶-2(1H)-酮,实验简单方便,产率高,纯度高。 相似文献
6.
7.
8.
苯并噁嗪酮化合物广泛存在于禾本科植物中,这类化合物在前药合成和生物活性研究方面具有广泛的应用前景.目前已知的合成方法中,大多都是采用邻氨基酚与ClC(R1R2)COCl(氯酰氯)在碱性条件下长时间回流制得的,反应时间较长;除反应原料外,还需要加入其它碱性物质和溶剂. 相似文献
9.
微波促进下2,5-二取代-1,3,4-(口恶)二唑衍生物的合成 总被引:9,自引:0,他引:9
报道了微波促进无溶剂条件下二酰基肼可以良好产率脱水闭环得到2,5-二取代-1,3,4-E二唑衍生物。反应产率受取代基影响较大,苯基取代时产率较高,烷基取代时产率较低;反应产率与所用的无机支持有关,其中以酸性三氧化二铝的效果最佳。此法不仅环境友好且操作安全,避免使用化学脱水剂。 相似文献
10.
11.
以α-氨基乙酸和芳基异硫氰酸酯为起始原料制备3-芳基-2-硫乙内酰脲, 然后在酸性条件下与3-甲酰基色酮发生类Knoevenagel缩合反应, 合成得到了16种新的5-(色酮-3-亚甲基)-3-芳基硫乙内酰脲类化合物. 所有化合物的结构均经IR, 1H NMR, LC-MS和元素分析确证, 并做了初步的生理活性测试 相似文献
12.
13.
14.
15.
N. A. Larionova A. A. Zubarev L. A. Rodinovskaya A. M. Shestopalov 《Russian Chemical Bulletin》2013,62(5):1297-1298
An approach to the synthesis of substituted ethyl 3-(3-hydroxy-2-thienyl)-3-oxopropanoates was developed based on the reaction of ethyl cyanoacetate, carbon disulfide, and ethyl 4-chloroacetoacetate. The reaction regioselectively involved the ester group, rather than the nitrile one like in the case when malononitrile or cyanacetamide were used. 相似文献
16.
Gard Gjessing Lars-Inge Gammelster Johnsen Simen Gjelseth Antonsen Jens M. J. Nolse Yngve Stenstrm Trond Vidar Hansen 《Molecules (Basel, Switzerland)》2022,27(7)
Monohydroxylated polyunsaturated fatty acids belonging to the oxylipin class of natural products are present in marine and terrestrial sources as well as in the human body. Due to their biological activities and role in diverse biosynthetic pathways, oxylipins biosynthesized from eicosapentaenoic acid and arachidonic acid have attracted great interest from the scientific community. One example is 3-hydroxyeicosapentaenoic acid where the absolute configuration at C-3 has only been tentatively assigned. In this paper, studies on acetate type aldol reactions that enabled the preparation of 3-(R)-hydroxyeicosapentaenoic acid (3R-HETE, 2) and its enantiomer are presented. 相似文献
17.
18.
E. E. Mikhlina V. Ya. Vorob'eva K. F. Turchin M. V. Rubtsov 《Chemistry of Heterocyclic Compounds》1968,4(6):787-790
A series of 3-alkyl(aryl)-3-aminoquinuclidines was synthesized by means of the interaction between 3-alkyl(aryl)-3-oxyquinuclidines and acetonitrile in the presence of concentrated sulfuric acid with subsequent hydrolysis of the 3-alkyl(aryl)-3-acetaminoquinuclidines. It was shown that in addition to acetamino derivatives 3-alkyl-2-dehydroquinuclidines and 3-alkylidenequinuclidines are formed, the structure of which was established by the method of NMR. 相似文献
19.
Farzaliev V. M. Abbasova M. T. Soltanova Z. K. Safarova L. R. 《Russian Journal of Organic Chemistry》2022,58(6):800-804
Russian Journal of Organic Chemistry - The condensation/heterocyclization of 2-aminoethanol with formaldehyde and various alcohols afforded 3-(organyloxymethyl)-1,3-oxazolidines. Their yields... 相似文献