共查询到20条相似文献,搜索用时 78 毫秒
1.
以苯磺酰肼为原料,在低温下滴加苯甲酰氯,方便地合成了7个1-苯甲酰-2-苯磺酰肼类化合物,收率40.3%~75.8%。其结构经1H NMR表征。 相似文献
2.
3.
4.
5.
设计合成了5种新型烷基取代酰肼-吡啶-N-氧化物,并将其作为水相铜催化含氮杂环与芳香碘代物偶联反应的配体.实验结果表明,十二烷基取代酰肼-吡啶-N-氧化物的催化效果最佳.对影响反应的其它条件,如铜源、碱、反应时间和温度等条件进行了优化,建立了最佳反应条件:CuO(10%,摩尔分数),NaOH(1 mmol),TBAB(5%,摩尔分数),L5(20%,摩尔分数),于120℃反应12 h,无需惰性气体保护.在此条件下,芳香碘代物与咪唑偶联反应的产率为60%~92%.该方法的特点是以水作为反应溶剂,长链烷基取代酰肼-吡啶-N-氧化物同时起到了铜催化剂配体和相转移催化剂的作用. 相似文献
6.
7.
8.
9.
研究开发了一个实用高效的钯铜共催化体系,1%Pd(OAc)2与10%CuCl2.2H2O双金属组合催化剂在弱碱和0.5 equiv PPh3配体存在下,顺利催化苯并唑类杂环与各种芳基溴的直接芳基化,并得到良好的收率.该钯铜共催化体系具有钯催化计量低、配体廉价易得、底物适用范围广、反应条件温和等特点. 相似文献
10.
N,N′-二芳基己二酰二肼类化合物的合成及其结构表征 总被引:5,自引:1,他引:5
报道了N,N′-二芳基己二酰二肼类化合物的合成方法。以自制的己二酰二氯、取代苯肼为原料,以二氯甲烷为溶剂,用冰浴法合成了9种新型的N,N′-二芳基己二酰二肼类化合物。产品的结构经元素分析、IR、1HNMR等测试技术得到确证,产物的IR谱中,在3 200~3 400 cm-1出现2个N—H吸收峰,1H NMR谱中,在δ7.3~10.5之间有2个N—H吸收峰,产品的元素分析结果与理论值基本相符。收率81%~93%。 相似文献
11.
12.
Wanrong Dong Chaoyang Liu Xinchi Ma Yingjun Zhang Zhihong Peng Dexun Xie Delie An 《Tetrahedron》2019,75(29):3886-3893
A Cu-mediated ligand-free arylation of NH-sulfoximines and sulfonamides by arylhydrazine hydrochlorides was herein demonstrated. The oxidative transformation provided an easy access towards N-aryl sulfoximines and sulfonamides in high yields (up to 93% yields) with broad functional groups tolerance (up to 36 examples). The protocol was proposed to take place through the free radical pathway based on the results of control reactions and EPR analysis. 相似文献
13.
14.
15.
16.
17.
18.
19.
20.
Vilija Kederien Jolanta Rousseau Marie Schuler Algirdas a
kus Arnaud Tatibouët 《Molecules (Basel, Switzerland)》2022,27(17)
The 1,3-oxazolidine-2-thiones (OZTs) are important chiral molecules, especially in asymmetric synthesis. These compounds serve as important active units in biologically active compounds. Herein, carbohydrate anchored OZTs were explored to develop a copper-catalyzed C-S bond formation with aryl iodides. Chemoselective S-arylation was observed, with copper iodide and dimethylethylenediamine (DMEDA) as the best ligand in dioxane at 60–90 °C. The corresponding chiral oxazolines were obtained in reasonable to good yields under relatively mild reaction conditions. This approach is cheap, as using one of the cheapest transition metals, a simple protocol and various functional group tolerance make it a valuable strategy for getting S-substituted furanose-fused OZT. The structures of the novel carbohydrates were confirmed by NMR spectroscopy and an HRMS analysis. 相似文献