A K-arylacetylide complex for catalytic terminal alkyne functionalization using KO<sup>t</sup>Bu as a precatalyst
作者:Jasimuddin Ahmed、Asim Kumar Swain、Arpan Das、R. Govindarajan、Mrinal Bhunia、Swadhin K. Mandal
DOI:10.1039/c9cc07833a
日期:——
Herein we report a transition metal free catalytic terminal alkyne functionalization across the C–X triple bond (X = CH and N) with E-selective homo (alkyne–alkyne) and head-to-tail selective hetero (alkyne–nitrile) dimerization. A series of stoichiometric reactions enabled us to crystallize a reactive organometallic intermediate K-arylacetylide complex which was characterized by X-ray crystallography
An efficient protocol has been established for the synthesis of conjugated ynones via addition of terminalalkynes to aromatic nitriles, which is catalyzed by novel divalent lanthanide amide complexes. All the reactions gave the products in good to excellent yields at room temperature under solvent-free conditions without any additives. The novel lanthanide amide catalysts were also synthesized and
Rapid, room-temperature self-organization of polyarylated 1<i>H</i>-pyrroles from acetylenes and nitriles in the KOBu<sup><i>t</i></sup>/DMSO system
作者:Elena Yu. Schmidt、Inna V. Tatarinova、Natal'ya A. Lobanova、Igor A. Ushakov、Irina Yu. Bagryanskaya、Boris A. Trofimov
DOI:10.1039/d3ob01311a
日期:——
molecule of nitrile at room temperature in the KOBut/DMSO system to afford 2-aryl-3-arylethynyl-4-aryl-5-benzyl-1H-pyrroles in up to 76% yield. We assume that this unprecedented self-organization process involves the cascade addition of acetylenic carbanions, first to the CN, then to the CC and CC bonds of the intermediates, followed by pyrrole ring closure via the intramolecular nucleophilic addition of the
我们发现,室温下,三分子芳基乙炔在 KOBu t /DMSO 体系中与一分子腈快速(15 分钟)组装,得到 2-芳基-3-芳基乙炔基-4-芳基-5-苄基-1 H -吡咯的收率高达76%。我们假设这种前所未有的自组织过程涉及炔属碳负离子的级联加成,首先加成到C N,然后加到中间体的C C 和CC C 键,然后通过NH 官能团的分子内亲核加成实现吡咯环闭合基团连接到最终中间体的CC键。