The cyclic alkynes 5-cyclononynone (23) and 5-cyclodecynone (24) were dimerized by heating with CpCo(CO)2 to form the tricyclic CpCo-stabilized cyclopentadienone derivatives 25 and 26, respectively. These diketones were transformed to the tricyclic diynes 30, 31, and 33, via the corresponding bis(selenadiazoles). Whereas the diynes 30 and 31 did not yield the desired bis(cyclopentadienono)phanes, we
Direct synthesis of 3-arylindoles via annulation of aryl hydroxylamines with alkynes
作者:Angus A. Lamar、Kenneth M. Nicholas
DOI:10.1016/j.tet.2009.03.004
日期:2009.5
3-Arylindoles are produced in moderate to excellent yields from the reaction between aryl hydroxylamines and alkynes catalyzed by 10 mol % iron(II) phthalocyanine [Fe(Pc)]. Terminal and internal alkynes afford 3-aryl substituted indoles exclusively. Electron-donating and -withdrawing groups are tolerated on the aryl hydroxylamine. A few bioactive indoles are synthesized as well as several new indoles
Isolable Tris(alkyne) and Bis(alkyne) Complexes of Gold(I)
作者:Animesh Das、Chandrakanta Dash、Muhammed Yousufuddin、Mehmet Ali Celik、Gernot Frenking、H. V. Rasika Dias
DOI:10.1002/anie.201200080
日期:2012.4.16
Golden trefoils: Tris(alkyne)goldcomplex [(coct)3Au][SbF6] (see picture; 1‐SbF6) can be synthesized from cyclooctyne (coct) and AuSbF6 generated in situ. Treatment of AuCl with cyclooctyne led to the bis(alkyne)goldcomplex [Au(coct)2Cl] (2). DFT analysis indicates that the cyclooctyne ligands are net electron donors in 1 but overall electron acceptors in 2. AuSbF6 is shown to mediate [2+2+2] cycloaddition