Cationic gold(I) complexes with hollow‐shaped triethynylphosphine ligands efficiently catalyzed intramolecular [2+2] cycloaddition of 1,9‐enynes to afford cyclobutene‐fused eight‐membered carbocycles that were difficult to synthesize by other catalytic systems. Various 1,9‐enynes with carbon linkers with or without a fused ring underwent efficient [2+2] cycloaddition with 5 mol% of the Au catalyst
Lewis Acid-Catalyzed Intramolecular [3+2] Cross-Cycloaddition of Aziridine 2,2-Diesters with Conjugated Dienes for Construction of Aza-[<i>n</i>
.2.1] Skeletons
作者:Yizhou Zhan、Tao Liu、Jun Ren、Zhongwen Wang
DOI:10.1002/chem.201704695
日期:2017.12.19
Cyclosomatic: [3+2] intramolecular cross-cycloaddition (IMCC) of aziridine 2,2-diesters with conjugated dienes has been successfully developed. This is the first regiospecific IMCC of intramolecular 1,3-dipolarcycloadditions of azomethineylides with carbon=carbon double bonds, and supplies a general and efficient strategy for construction of structurally complex and diverse aza-[n.2.1] skeletons
脂环式:氮丙啶2,2-二酯与共轭二烯的[3 + 2]分子内跨环加成(IMCC)已成功开发。这是具有碳=碳双键的偶氮甲亚胺分子内1,3-偶极环加成的第一个区域特异性IMCC,为构建结构复杂和多样的aza- [ n .2.1]骨架提供了通用而有效的策略。
Construction of Eight-Membered Carbocycles through Gold Catalysis with Acetylene-Tethered Silyl Enol Ethers
Semihollow triethynylphosphanes were synthesized and employed as ligands in the gold‐catalyzed 8‐exo‐dig cyclization of acetylene‐tethered silyl enolethers to obtain eight‐membered‐ring carbocycles (see scheme). The gold–phosphane catalysts promoted either the annulation toward bicyclic structures or the cyclization of acyclic molecules to form nonfused carbocycles. Tf=Trifluoromethylsulfonyl.
Palladium(II)-catalyzed coupling reactions of alkynes and allylic compounds initiated by intramolecular carbopalladation of alkynes
作者:Guosheng Liu、Xiyan Lu
DOI:10.1016/s0040-4039(02)01512-5
日期:2002.9
Under divalent palladium catalysis, a highly regio- and stereoselectivecoupling reaction of alkynes with allylhalides initiated by cyclocarbopalladation of alkynes proceeded smoothly in the presence of excess halide ions. The reaction involves intramolecular carbopalladation, allylic compound insertion into the vinylicPd bond and quenching the CPd bond by β-heteroatom elimination in one step without
Mechanistic analysis of aliphatic β-lactones in Vibrio harveyi reveals a quorum sensing independent mode of action
作者:Weining Zhao、Nicola Lorenz、Kirsten Jung、Stephan A. Sieber
DOI:10.1039/c6cc05807h
日期:——
β-Lactone analogs of autoinducers potently inhibitVibrio harveyibioluminescence using a quorum sensing independent mechanism interfering with fatty acid biosynthesis.