得益于其独特的性能,结构新颖且易于使用的中环的开发在制药业和学术研究中引起了极大的兴趣。然而,由于其刚性的骨架和大角度的应变,很难接近中环支架。在本文中,设计,合成了一种新型的带有双氮唑基(MRBT)的中环,被鉴定为铜(I)催化的点击反应的一种有希望的新骨架配体,并用于蛋白质的位点修饰。一种MRBT,3aa,具有高达55,000的周转率(TON),并具有显着的加速作用(k obs = 1.95 M –1 s –1),并且在铜催化的炔烃和叠氮化物环加成反应中位居最有效的配体之列。与难以接近其他已知的中环不同,这些7-12元MRBT可以用结构简单的线性末端二炔和叠氮化物以直接,一步一步的方式制备。因此,独特的可访问性和引人入胜的特性暗示了它们广阔的应用前景。
A method for the synthesis of phosphabenzenes under iron catalysis is described. Thus, the FeI2‐catalyzed [2+2+2] cycloaddition of diynes with phosphaalkynes in m‐xylene gave a variety of phosphabenzenes in good to high yields (up to 87 % yield).
Gold-catalyzed hydrative cyclization of terminal 1,6-diynes proceeds in ionic liquid with methanol as co-solvent. The solvent-catalyst could be recycled, after separation of the product by extraction with ether.
Iron-catalyzed [2 + 2 + 2] cycloaddition reactions of diynes with siloxyphosphaethynes have been developed to give 2-phosphaphenol derivatives. The use of electronically neutral siloxyphosphaethynes generated in situ by the reaction of anionic phosphaethynolate with silyl triflates is key to achieving the reactions.
Manganese-Catalyzed Sequential Annulation between Indoles and 1, 6-Diynes
作者:Xiaofei Yi、Kai Chen、Wanzhi Chen
DOI:10.1002/adsc.201801043
日期:2018.12.3
Manganese‐catalyzedselective annulation reaction between indoles and 1,6‐diynes is described. Various carbazole derivatives were isolated in moderate to good yields. The formation of the fused ring compounds involves the construction of three C−C bonds in one‐pot through manganese‐catalyzedC−H bond activation, alkyne insertion, and oxidative dehydrogenation.
Silver-Catalyzed Tandem Hydroazidation/Alkyne–Azide Cycloaddition of Diynes with TMS-N<sub>3</sub>: An Easy Access to 1,5-Fused 1,2,3-Triazole Frameworks
作者:Yongquan Ning、Nannan Wu、Haifeng Yu、Peiqiu Liao、Xingqi Li、Xihe Bi
DOI:10.1021/acs.orglett.5b00784
日期:2015.5.1
A general cascade hydroazidation and alkyne-azide 1,3-dipolar cycloaddition of diynes using silver catalysis is reported. A wide variety of diynes participated in the reaction with trimethylsilyl azide (TMS-N-3) in the presence of H2O, affording the corresponding 1,5-fused-1,2,3-triazoles in good-to-excellent yields. This unprecedented protocol is operationally simple with a broad substrate scope, good functional group tolerance, and high reaction efficiency, thus providing easy access to various fused 1,2,3-triazoles.