A one‐pot synthesis of highly substituted quinolines is reported. The sequence starts with the C(sp3)‐H functionalization of α‐amino ketone derivatives, glycine esters, or glycine amide in the presence of iodine. Subsequently, a nucleophilic substitution with alkynes or alkynyl esters takes place. An aerobic oxidative aromatization in water with sodium dodecyl sulfate (SDS) as surfactant gives the
Symmetrical Donor-Acceptor-Donor (D-A-D) 2H-benzo[d][1,2,3]triazole derivatives have been designed by DFT calculations and prepared by a multistep synthetic protocol. The design strategy involved the identification of a suitable acceptor benzotriazole core and modification of the steric volume and donor strength of the branches in order to modulate the Intramolecular Charge Transfer (ICT) process and
Selective Formation of 1,4-Disubstituted Triazoles from Ruthenium-Catalyzed Cycloaddition of Terminal Alkynes and Organic Azides: Scope and Reaction Mechanism
作者:Pei Nian Liu、Juan Li、Fu Hai Su、Kun Dong Ju、Li Zhang、Chuan Shi、Herman H. Y. Sung、Ian D. Williams、Valery V. Fokin、Zhenyang Lin、Guochen Jia
DOI:10.1021/om300513w
日期:2012.7.9
The catalytic activity of a series of ruthenium complexes lacking cyclopentadienyl ligands has been evaluated for the cycloaddition of terminal alkynes and azides to give selectively 1,4-disubstituted 1,2,3-triazoles. The complex RuH(eta(2)-BH4)(CO)(PCy3)(2) was found to be an effective catalyst for the cycloaddition reactions. In the presence of RuH(eta(2)-BH4)(CO)(PCy3)(2), primary and secondary azides reacted with a range of terminal alkynes containing various functionalities to selectively produce 1,4-disubstituted 1,2,3-triazoles. The ruthenium-catalyzed azide-alkyne cycloaddition appears to proceed via a Ru-acetylide species as the key intermediate, which undergoes formal cycloaddition with an azide to give a ruthenium triazolide complex. The 1,4-disubstituted 1,2,3-triazole product is generated by metathesis of the triazolide complex with a terminal alkyne. In support of the reaction mechanism, the acetylide complex Ru(C CCMe3)(2)(CO)(PPh3)(3) reacts cleanly with benzyl azide to give a ruthenium triazolide complex, which reacts with excess tert-butylacetylene in the presence of PPh3 to give 4-tert-butyl-1-benzyl-1,2,3-triazole and the diacetylide complex Ru(C CCMe3)(2)(CO)(PPh3)(3). The mechanism is also supported by DFT calculations.
Brouw, Paul M. op den; Laarhoven, Wim H., Journal of the Chemical Society. Perkin transactions II, 1982, p. 795 - 800
作者:Brouw, Paul M. op den、Laarhoven, Wim H.
DOI:——
日期:——
Rhodium catalysts with superbulky NHC ligands for the selective α-hydrothiolation of alkynes
作者:Małgorzata Bołt、Lionel Delaude、Patrycja Żak
DOI:10.1039/d2dt00243d
日期:——
Eight rhodium complexes—including four new compounds—with the generic formula [RhCl(cod)(NHC)] (cod is 1,3-cyclooctadiene) differing by the size of their N-heterocyclic carbene (NHC) ligand were prepared, characterized, and found to be catalytically active in the hydrothiolation of terminal alkynes with aliphatic or aromatic thiols. The steric bulk of the carbene was found to markedly influence the