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。
Multi-component syntheses of diverse 5-fluoroalkyl-1,2,3-triazoles facilitated by air oxidation and copper catalysis
作者:Anlian Zhu、Xiaofang Xing、Shilei Wang、Donghe Yuan、Gongming Zhu、Mingwei Geng、Yuanyang Guo、Guisheng Zhang、Lingjun Li
DOI:10.1039/c9gc00647h
日期:——
synthesized from available fluoroalkyl reagents, terminal alkynes and organic azides via one-pot reactions. Air was used as the sole oxidant; this significantly reduced the cost of this transformation, and the resulting operations and work-up procedures were significantly simplified. Alkyl azides and alkynes bearing various functional groups and natural structural motifs, and even aryl azides, which were
空气是一种理想的氧化剂,因为它的含量丰富,成本低廉且没有有毒的副产物。然而,由于其活性降低和选择性差,使用空气作为氧化剂的催化好氧氧化反应仍然具有挑战性。在这项研究中,成功合成了一类新的甘氨酰胺型配体,并通过亲核性氟烷基试剂原位捕获形成的三唑化物,用于需氧氧化反应。通过这个设计过程的氧化,各种5-氟代-1,2,3-三唑可以从可用的氟代试剂,末端炔烃和有机叠氮化物的合成通过一锅反应。空气被用作唯一的氧化剂。这显着降低了这种转换的成本,并且显着简化了所产生的操作和后处理程序。带有各种官能团和天然结构基序的烷基叠氮化物和炔烃,甚至在其他报道的方法中无效的芳基叠氮化物,在当前条件下均能有效反应。可以有效地使用不同的氟代烷基试剂,包括三氟甲基三甲基硅烷(CF 3 TMS),五氟乙基三甲基硅烷(C 2 F 5 TMS)和七氟丙基三甲基硅烷(C 3 F 7 TMS)。机理研究进一步表明,新的N,O配
Efficient copper-catalyzed tandem oxidative iodination and alkyne-azide cycloaddition in the presence of glycine-type ligands
作者:Donghe Yuan、Shilei Wang、Gongming Zhu、Anlian Zhu、Lingjun Li
DOI:10.1016/j.tet.2020.131911
日期:2021.2
described that a copper-catalyzed (10 mol%) tandem oxidativeiodination and alkyne-azide cycloaddition could be completed in the presence of the newly-found glycine-type ligands with low-cost NaI as the iodine resource. In the novel reaction system, a wide range of terminal alkyne, organic azide and inexpensive iodide could react effectively in one pot to give structurally diverse 5-iodo-1,4-subsitutied 1,2
Synthesis of Pyrrole-3,4-diacetic Acid and Its Derivatives
作者:Gian Paolo Chiusoli、Mirco Costa、Sara Reverberi
DOI:10.1055/s-1989-27217
日期:——
A simple procedure for the synthesis of pyrrole-3,4-diacetic esters and N-derivatives thereof consists of the oxidative alkoxycarbonylation of dipropargylamine or N-derivatives to give 3,4-bis(alkoxycarbonylmethylene) pyrrolidines which can be easily isomerized to pyrrole-3,4-diacetic esters. Controlled hydrolysis of these esters affords pyrrolidine-3,4-diacetic acid.
A novel ligand (6) for copper-catalyzed azide–alkynecycloaddition (CuAAC) in bioconjugation has been developed. Both in vitro and in vivo experiments indicate that 6 is more efficient and less cytotoxic than the canonical CuAAC ligands. Besides, 6 is easily accessible and can be prepared at gram scale. Our study reveals that 6 might be an ideal CuAAC ligand for bioconjugations.