Synthesis of flavanones, azaflavanones, and thioflavanones catalyzed by PMA-SiO2 as a mild, efficient, and reusable catalyst
摘要:
Cyclization of a variety of chalcones to flavanones catalyzed by 1 mol% phosphomolybdic acid (PMA) supported on silica as a mild, efficient, and reusable catalyst was carried out in high yields. PMA-SiO2 is an efficient, inexpensive, and green catalyst which gave high conversion yields and could be recycled up to three times without significant loss in activity.
Asymmetric Organocatalytic Quadruple Cascade Reaction of 2-Hydroxychalcone with Cinnamaldehyde for the Construction of Tetrahydro-6<i>H</i>-benzo[<i>c</i>]chromene Containing Five Stereocenters
作者:Lingyan Liu、Yunna Zhu、Kaimeng Huang、Bing Wang、Weixing Chang、Jing Li
DOI:10.1002/ejoc.201402159
日期:2014.7
An asymmetric organocatalytic quadruple cascadereaction was developed for the stable and sterically hindered 2-hydroxychalcones and substituted cinnamaldehydes. This process proceeded through an oxa-Michael–Michael–Michael–aldol condensation to afford highly functionalized tetrahydro-6H-benzo[c]chromene derivatives with high diastereoselectivity and enantioselectivity (>99 % ee). The structure of
为稳定和空间位阻的 2-羟基查尔酮和取代的肉桂醛开发了不对称有机催化四级联反应。该过程通过氧杂-迈克尔-迈克尔-迈克尔-羟醛缩合反应得到高度官能化的四氢-6H-苯并[c]色烯衍生物,具有高非对映选择性和对映选择性(>99%ee)。具有五个立体中心的加合物 4g 的结构通过单晶 X 射线衍射得到明确证实,有价值的质谱数据为所提出的反应机理提供了直接支持。
One-Pot Synthesis of O-Heterocycles or Aryl Ketones Using an InCl<sub>3</sub>/Et<sub>3</sub>SiH System by Switching the Solvent
作者:Wenqiang Jia、Qiumu Xi、Tianqi Liu、Minjian Yang、Yonghui Chen、Dali Yin、Xiaojian Wang
DOI:10.1021/acs.joc.9b00140
日期:2019.5.3
An efficient one-pot synthesis of O-heterocycles or aryl ketones has been achieved using Et3SiH in the presence of InCl3 via a sequential ionic hydrogenation reaction by switching the solvent. This methodology can be used to construct C–O bonds and to prepare conjugate reduction products, including chromans, tetrahydrofurans, tetrahydropyrans, dihydroisobenzofurans, dihydrochalcones, and 1,4-diones
Novel isoniazid-spirooxindole derivatives: design, synthesis, biological evaluation, in silico ADMET prediction and computational studies
作者:Mayuri A. Borad、Divya J. Jethava、Manoj N. Bhoi、Chirag N. Patel、Himanshu A. Pandya、Hitesh D. Patel
DOI:10.1016/j.molstruc.2020.128881
日期:2020.12
Abstract In the present scenario, the Synthesis of new and desired antimycobacterial agent has an eternal demand to resist Mycobacterium tuberculosis (MTB). The design and identification of new molecules for the treatment of tuberculosis is an important task in organic as well as medicinal chemistry research. In the present study, we have reported the combination of the desired compound using two versatile
Synthesis, characterization and antimicrobial studies on 3-((4-(4-nitrophenyl)-6-aryl-1,6-dihydropyrimidin-2-yl)thio)propanenitriles and their derivatives
作者:N. C. Desai、Darshan Pandya、Darshita Vaja
DOI:10.1007/s00044-017-1812-2
日期:2017.6
AbstractThis study synthesized a series of 3-((4-(4-nitrophenyl)-6-aryl-1,6-dihydropyrimidin-2-yl)thio)propanenitriles and their structures characterized by spectral (1H NMR, 13C NMR, infrared spectroscopy, liquid chromatography-mass spectroscopy) and elemental analysis. Antimicrobial activity was carried out by serial broth dilution method on gram-positive bacteria (Staphylococcus aureus and Streptococcus
摘要这项研究合成了一系列3-((4-(4-硝基苯基)-6-芳基-1,6-二氢嘧啶-2-基)硫基)丙腈及其结构,并通过光谱(1 H NMR,13 C NMR,红外光谱,液相色谱-质谱)和元素分析。通过系列肉汤稀释法对革兰氏阳性菌(金黄色葡萄球菌和化脓性链球菌),革兰氏阴性菌(大肠杆菌和铜绿假单胞菌)和三种真菌(白色念珠菌,黑曲霉和黑曲霉)进行抗菌活性。化合物5d中,图5j,5l和5m显示出对测试微生物的有效抗菌活性。对人宫颈癌细胞系(HeLa)和3T3小鼠胚胎成纤维细胞系的细胞毒性研究表明,化合物5c,5d,5h和5j显示出低细胞毒性。 图形概要
Asymmetric organocatalytic cascade Michael/acyl transfer reaction of 2-hydroxychalcones with α-nitroketones
作者:Yingying Liu、Yiran Mo、Xiaodi Dong、Lin Chen、Ling Ye、Xinying Li、Zhigang Zhao、Xuefeng Li
DOI:10.1016/j.tet.2019.03.021
日期:2019.4
A highly enantioselective (84–97% ee) cascadeMichael/acyl transfer reaction of α-nitroketones to a wide range of 2-hydroxychalcones was established in the presence of a bifunctional squaramide. Although aliphatic α-nitroketones were revealed to be a class of challenging substrates with unsatisfactory reactivity or enantioselectivity by previous reports, good isolated yields and excellent enantiopurities