A gold(I) autotandem catalysis protocol is reported for the de novo synthesis of densely substituted pyrazolines and dihydropyridines from the corresponding imine derivatives in a highly regioselective fashion via a one-pot aza-enyne metathesis/6π-electrocyclization sequence. The substituents on the nitrogen atom of the imine perfectly control the reaction pathways from the pivotal 1-azabutadiene intermediate;
Highly chemoselective synthesis of imine over Co/Zn bimetallic MOFs derived Co3ZnC-ZnO embed in carbon nanosheet catalyst
作者:Wei She、Jing Wang、Xuewei Li、Jingfang Li、Guijie Mao、Weizuo Li、Guangming Li
DOI:10.1016/j.jcat.2021.07.005
日期:2021.9
thickness of ca. 5.0 nm was fabricated through the direct pyrolysis of a Co/Zn bimetallic MOFs at 500 °C (named as Co3ZnC-ZnO/NC-500). Surprisingly, the developed Co3ZnC-ZnO/NC-500 catalyst delivers 99.9 % conversion of nitrobenzene and 98.5 % selectivity to N-benzylideneaniline in one-pot reductive amination of nitrobenzene with benzaldehyde. Various characterizations (including as SEM, XRD, TEM, AFM, XPS
通过硝基芳烃与芳香醛的还原胺化一锅法直接合成亚胺仍然是一个巨大的挑战,部分原因是亚胺过度氢化成仲胺。在本文中,一种新型的 Co 3 ZnC 和 ZnO 负载在厚度为约 1 的N 掺杂碳纳米片催化剂上。通过在 500°C 下直接热解 Co/Zn 双金属 MOF(命名为 Co 3 ZnC-ZnO/NC-500)制造了 5.0 nm 。令人惊讶的是,在硝基苯与苯甲醛的一锅还原胺化反应中,开发的 Co 3 ZnC-ZnO/NC-500 催化剂提供了 99.9% 的硝基苯转化率和 98.5% 的N-亚苄基苯胺选择性。各种表征(包括 SEM、XRD、TEM、AFM、XPS、拉曼和 N 2吸附-解吸)表明,生成的 Co 3 ZnC 合金的尺寸小、结构缺陷丰富、比表面积更大(105.5 m 2 ·g -1)以及更多的碱性位点是 Co 3出色的催化活性的原因。用于串联反应的 ZnC-ZnO/NC-500 催化剂。此外,Co
Silver-Catalyzed Three-Component Approach to Quinolines Starting from Anilines, Aldehydes, and Alcohols
作者:Xu Zhang、Zhiqiang Wang、Wenmin Liu、Ruixue Sun、Xuefeng Xu、Yanlei Yan
DOI:10.1055/s-0035-1561916
日期:——
A silver-catalyzed sequential formation of two C–C bonds for the construction of a series of polysubstituted quinolines from anilines, aldehydes, and alcohols under mild conditions has been developed. The transformation is effective for a broad range of substrates, including aliphatic alcohols, arylalkanols, cycloalkanols, and ethylene glycol, thereby permitting the expansion of the constituent architectures
Highly Regioselective Synthesis of Substituted Pyrroles Utilizing Low-Valent Titanium Reagent
作者:Daqing Shi、Guolan Dou、Chunling Shi、Zhengyi Li、Shun-Jun Ji
DOI:10.1055/s-2007-990787
日期:2007.10
A short and efficientsynthesis of substituted pyrroles was accomplished in good yields via the novel coupling cyclization reaction of 1,3-diketones with imines promoted by low-valenttitaniumreagent. High regioselectivity was achieved and the structures of two of the products were confirmed by X-ray diffraction studies.
通过低价钛试剂促进的 1,3-二酮与亚胺的新型偶联环化反应,以良好的收率完成了取代吡咯的短而有效的合成。实现了高区域选择性,并且通过 X 射线衍射研究证实了两种产物的结构。
Study on the interaction of triaryl-dihydro-1,2,4-oxadiazoles with α-glucosidase
and 295 ± 4 μM respectively. A kinetic study performed for compound 6c revealed that the compound is a competitive inhibitor of Saccharomyces cerevisiae α-glucosidase with K i of 122 μM. The docking study also revealed that the two compounds, 6c and 6 k , have important binding interactions with the enzyme active site. Conclusion The overall results of our study reveal that the synthesized compounds