Synthesis of formamides containing unsaturated groups by N-formylation of amines using CO<sub>2</sub> with H<sub>2</sub>
作者:Hangyu Liu、Qingqing Mei、Qingling Xu、Jinliang Song、Huizhen Liu、Buxing Han
DOI:10.1039/c6gc02243j
日期:——
Formamides have wide applications in industry and have been synthesized using CO2 as carbon source and H2 as reducing agent. However, previous systems required noble catalyst and high temperature to...
The ruthenium-catalyzed hydrocarbamoylative cyclization of 1,6-diynes with formamides afforded exocyclic-diene-type α,β,γ,δ-unsaturated amides with 100% stereoselectivity. A plausible mechanism involving ruthenium hydride species is proposed to explain the experimental results. Some control experiments, performed using DMF-d7 and/or D2O, corroborate the proposed mechanism.
Synthesis of dihydrobenzofurans was achieved by a route involving the insertion of arynes into formamides followed by trapping with zinc enolates of α-chlorinated methines. Benzofurans were generated from dihydrobenzofurans having a ketone group via the addition of an ethyl anion, the retro-aldol type reaction, and the elimination of an amino group.
Reaction of Tröger’s base analogues with Vilsmeier reagents
作者:Qasim M. Malik、Andrew B. Mahon、Donald C. Craig、Andrew C. Try
DOI:10.1016/j.tet.2011.08.095
日期:2011.11
As part of a program aimed at introducing functionality onto the Tröger’s base framework post-synthesis, we investigated the formylation reaction of Tröger’s baseanalogues with Vilsmeier reagents. We found that rather than the anticipated reaction at the aryl rings, these compounds react with Vilsmeier reagents to afford compounds with a modified strap, whereby the apical methylene group is replaced