Gold(III)‐Catalyzed Intermolecular Oxidation‐Cyclization of Ynones: Access to 4‐Substituted Chroman‐3‐ones
作者:Jian Li、Fang Yang、Yang‐Ting Ma、Kegong Ji
DOI:10.1002/adsc.201900260
日期:2019.4.23
A synthesis of 4‐substituted chroman‐3‐one derivatives has been developed through a gold(III) catalyzed oxidation‐cyclization of ynones in good to excellent yield using easily prepared substrates. A broad range of synthetically useful functional groups (halide, alkene, alkyne, phenolic hydroxyl) were tolerated. Further application of this method paves a new way to prepare the skeleton of oblarotenoids
hydroboration of 2H-chromenes catalyzed by the complex of CuCl and diphosphine ligand (S,R)-DuanPhos has been realized under mild conditions to produce 3-boryl chromans, achieving good yields and excellent enantioselectivities up to 96% ee. This work provides an efficient approach to the synthesis of chiral 3-boryl chromans and derivatives.
Consecutive CH Functionalization Reactions of Arenes: Synthesis of Carbo- and Heteropolycyclic Skeletons
作者:Samuel Suárez-Pantiga、David Palomas、Eduardo Rubio、José M. González
DOI:10.1002/anie.200902989
日期:2009.10.5
Doubling the bet: Two CH bonds become functionalized upon exposure of ω‐aryl propargylic tosylates to Sc(OTf)3 (see scheme). The reaction involves a new domino process that can tolerate both electron‐withdrawing and ‐donating substituents on the arene unit. Different carbo‐ and heterocyclic frameworks can be assembled by using this approach to formally conquer the hydroarylation process.
Asymmetric Gold(I)‐Catalyzed Tandem Hydroarylation–Nazarov Cyclization: Enantioselective Access to Cyclopentenones
作者:Marta Solas、Samuel Suárez‐Pantiga、Roberto Sanz
DOI:10.1002/anie.202207406
日期:2022.8.26
A new enantioselective version of the Nazarov cyclization is reported. The reaction design uses readily available alkenynones to trigger a gold(I)-catalyzed anti-Michael hydroarylation of the ynone followed by Nazarov cyclization. A chiral gold complex is able to control the absolute stereochemistry of the process. Cyclopenta[c]chromenones, which combine the 2H-chromene and cylopentanone cores, are
报道了纳扎罗夫环化的新对映选择性版本。该反应设计使用容易获得的烯炔酮来触发炔酮的金(I)催化的反迈克尔加氢芳基化,然后进行纳扎罗夫环化。手性金络合物能够控制该过程的绝对立体化学。环戊[ c ]色酮结合了 2 H-色烯和环戊酮核心,合成时具有高产率和ee值。
CuAAC-Ensembled 1,2,3-Triazole-Linked Biphenyl and N-Arylamide Systems as Diverse Antimicrobial Agents
作者:N. M. Khadiya、V. A. Modhavadiya
DOI:10.1134/s107042802207017x
日期:2022.7
chemistry approach, namely Cu(I)-catalyzed azide–alkyne cycloaddition (CuAAC), has been employed to generate a library of 2-4-[([1,1′-biphenyl]-2-yloxy)methyl]-1H-1,2,3-triazol-1-yl}-N-(substituted phenyl)acetamides 7a–7j through a four-step procedure. The influence of different halogen substituents on the antibacterial properties of the synthesized compounds againstEscherichiacoli, Pseudomonas aeruginosa
摘要 点击化学方法,即 Cu(I) 催化的叠氮化物-炔烃环加成 (CuAAC),已被用于生成 2-4-[([1,1'-联苯]-2-基氧基)甲基] 库-1 H -1,2,3-triazol-1-yl}- N -(取代的苯基)乙酰胺7a – 7j通过四步程序。不同卤素取代基对合成化合物对大肠杆菌、铜绿假单胞菌、粪肠球菌、金黄色葡萄球菌和白色念珠菌抗菌性能的影响已使用氨苄青霉素和氟康唑作为参考药物进行了测试。在合成的联苯-三唑杂化物中,发现氟取代的体系比那些带有其他卤素原子的体系更活跃。