Organocatalyzed [2+2] Cycloaddition Reactions between Quinone Imine Ketals and Allenoates
作者:Teng Liu、Chao Huang、Feixiang Cheng、Chixian He、Fan Wang、Xiang Shen、Yongqin Li、Man Lang、Guijun Li
DOI:10.1055/s-0040-1707292
日期:2021.2
Abstract A new cycloaddition reaction of quinone imine ketals (QIKs), which could be utilized to the construction of functionalized azaspirocyclics under mild conditions, is described. This transformation involved a [2+2] cycloaddition reactionbetween QIKs and allenoates catalyzed by DABCO, and then treatment with 1 N HCl in one-pot. The strategy could provide a practical route to access azetidine-fused
Synthesis of Oxazine, Thiazine, and Quinoxaline Derivatives Containing a Benzyl Fragment from 3-Aryl-2-Bromopropanoic Acids and Their Esters
作者:N. T. Pokhodylo、R. L. Martyak、M. P. Rogovyk、V. S. Matiychuk、M. D. Obushak
DOI:10.1134/s1070428021040059
日期:2021.4
Abstract 3-Aryl-2-bromopropanoic acid esters reacted with o-phenylenediamine, 2-sulfanylaniline, and L-cysteine to give quinoxaline, 1,4-thiazine, and thiomorpholine derivatives, respectively, containing an arylmethyl substituent. Analogous 1,4-benzoxazine derivatives were synthesized by reactions of 3-aryl-2-bromopropanoyl chlorides with 2-aminophenol or 2-methoxyaniline.
Enantioselective Synthesis of 5-Alkylated Thiazolidinones via Palladium-Catalyzed Asymmetric Allylic C–H Alkylations of 1,4-Pentadienes with 5<i>H</i>-Thiazol-4-ones
作者:Tian-Ci Wang、Zhi-Yong Han、Pu-Sheng Wang、Hua-Chen Lin、Shi-Wei Luo、Liu-Zhu Gong
DOI:10.1021/acs.orglett.8b01697
日期:2018.8.17
A palladium-catalyzed, enantioselective allylic C–H alkylation of 1,4-pentadienes with 5H-thiazol-4-ones has been developed. Under the cooperative catalysis of a palladium complex of chiral phosphoramidite ligand and an achiral Brønstedacid, a broad range of substituted 5H-thiazol-4-ones bearing sulfur-containing tertiary chiral centers were accessed from the allylic C–H alkylation in high levels
SYNTHESIS OF HETEROCYCLES ON THE BASIS OF ARYLATION PRODUCTS OF UNSATURATED COMPOUNDS. 11.<sup>1</sup>5-R-BENZYL-2- IMINOSELENAZOLIDIN-4-ONES FROM ETHYL 3-ARYL-2-BROMOPROPANOATES
作者:Mykola D. Obushak、Vasyl S. Matiychuk、Volodymyr M. Tsyalkovsky、Roman M. Voloshchuk
DOI:10.1080/10426500490257096
日期:2004.1
3-aryl-2-bromopropanoates 2a–p were prepared by reaction of ethyl acrylate with arenediazonium bromides 1a–p in the presence of CuBr (Meerwein arylation). These compounds react with selenourea to form 5-R-benzyl-2-iminoselenazolidin-4-ones 4a–p. Compounds 4a–p hydrolyze into the corresponding selenazolidin-2,4-diones.
study, an efficient synthesis and the antimicrobialactivityevaluation of some 4-oxo-thiazolidin-2-ylidene derivatives are presented. The structures of the target substances were confirmed by using 1H and 13C nuclear magnetic resonance spectroscopy, mass spectrometry, infrared spectroscopy, and elemental analysis. The synthesized compounds were evaluated for antimicrobialactivity against five bacterial
在这项研究中,提出了一些 4-oxo-thiazolidin-2-ylidene 衍生物的有效合成和抗菌活性评估。目标物质的结构通过1 H 和13 C 核磁共振光谱、质谱、红外光谱和元素分析确定。评价合成的化合物对五种细菌菌株(大肠杆菌、肺炎克雷伯菌、鲍曼不动杆菌、铜绿假单胞菌和金黄色葡萄球菌)和两种真菌菌株(白色念珠菌和新型隐球菌)的抗菌活性)。结果表明,该系列化合物具有抗菌和抗真菌活性。