Synthesis of substituted quinolines by the electrophilic cyclization of n-(2-alkynyl)anilines
作者:Xiaoxia Zhang、Tuanli Yao、Marino A. Campo、Richard C. Larock
DOI:10.1016/j.tet.2009.12.012
日期:2010.2
A wide variety of substituted quinolines are readily synthesized under mild reaction conditions by the 6-endo-dig electrophilic cyclization of N-(2-alkynyl)anilines by ICl, I2, Br2, PhSeBr, and p-O2NC6H4SCl. The reaction affords 3-halogen-, selenium- and sulfur-containing quinolines in moderate to good yields in the presence of various functional groups. Analogous quinolines bearing a hydrogen in the
Silver(I)-Catalyzed Tandem Sigamatropic Rearrangement/1,3-H Shift/6π Aza-electrocyclization of <i>N</i>-Propargylic Hydrazones: A Mild Synthetic Route to 1,6-Dihydropyridazines
A highly efficient AgOTf catalyzed [3,3] sigmatropic rearrangement/1,3-H shift/6π aza-electrocyclization cascade reaction of N-propargylic hydrazones has been developed. This method provides a new mild synthetic route to various polysubstituted 1,6-dihydropyridazines including the 3-CF3-substituted ones with high selectivity.
Synthesis of fluoranthenes by hydroarylation of alkynes catalyzed by gold(I) or gallium trichloride
作者:Sergio Pascual、Christophe Bour、Paula de Mendoza、Antonio M Echavarren
DOI:10.3762/bjoc.7.178
日期:——
Electrophilic gold(I) catalyst 6 competes with GaCl(3) as the catalyst of choice in the synthesis of fluoranthenes by intramolecularhydroarylation of alkynes. The potential of this catalyst for the preparation of polyarenes is illustrated by a synthesis of two functionalized decacyclenes in a one-pot transformation in which three C-C bonds are formed with high efficiency.
亲电金 (I) 催化剂 6 与 GaCl(3) 竞争作为通过炔烃分子内加氢芳基化合成荧蒽的首选催化剂。这种催化剂用于制备聚芳烃的潜力通过在一锅转化中合成两个官能化十环烯来说明,其中三个 CC 键高效地形成。
Catalytic Cycloisomerization of Enyne Diesters Derived From 2‐Propargyloxyarylaldehydes
作者:Manoj Kumar Saini、Shashi Kant Verma、Ashok K Basak
DOI:10.1002/adsc.202200026
日期:2022.3.15
A catalytic cycloisomerization of enyne diesters derived from 2-propargyloxyarylaldehydes is described. The cycloisomerization, catalyzed by 10 mol% In(OTf)3, provides access to 2H-chromenes bearing diethyl 2-(hetero)arylidene malonates at 3-position. This enyne metathesis-type reaction is also useful for the synthesis of thia-, aza- and quinoline analogs of the 3-substituted 2H-chromenes. DDQ mediated
A direct and convenient approach for the coupling of propargylic substrates with diphenylphosphine oxide in the presence of Tf2O and 2,6-lutidine has been developed. The method provides a general approach for the construction of attractive allenylphosphoryl skeletons with high atom and step economy under metal free conditions.