Hollow structural effect of microporous organocatalytic polymers with pyrrolidines: dramatic enhancement of catalytic performance
作者:Kyoungil Cho、Jin Yoo、Hyeong-Wan Noh、Sang Moon Lee、Hae Jin Kim、Yoon-Joo Ko、Hye-Young Jang、Seung Uk Son
DOI:10.1039/c7ta02404e
日期:——
Hollow and microporous organocatalytic polymers bearing pyrrolidines (H-MOP-P) were prepared by template synthesis and post-synthetic modification and showed enhanced performance, compared to nonhollow ones.
Influence of steric demand on ruthenium-catalyzed cycloaddition of sterically hindered azides
作者:Venkata S. Sadu、Sirisha Sadu、Seji Kim、In-Taek Hwang、Ki-Jeong Kong、Kee-In Lee
DOI:10.1039/c6ra25403a
日期:——
The RuAAC of sterically hindered 2,2-diaryl-2-azidoamines and terminal alkynes resulted in the unprecedented formation of 1,4-disubstituted-1,2,3-triazoles. A control experiment with 2-(azidomethyl)pyrrolidine revealed the usual selectivity with RuAAC and the reactions of azides with intermediate bulkiness gave mixtures of 1,4- and 1,5-regioisomers. The results suggest that the steric demands could
Manganese(<scp>ii</scp>) chloride catalyzed highly efficient one-pot synthesis of propargylamines and fused triazoles via three-component coupling reaction under solvent-free condition
作者:Shakil N. Afraj、Chinpiao Chen、Gene-Hsian Lee
DOI:10.1039/c4ra03232b
日期:——
A one-pot green and highly efficient method for the synthesis of propargylamines and diastereoselective synthesis of fused triazoles via three-component coupling in the presence of manganese(II) chloride as a catalyst and a catalyst-free 1,3-dipolar cycloaddition reaction, respectively, without using a co-catalyst or activator is reported. This methodology is efficient, eco-friendly, operationally
A practical and efficient regioselective synthesis of several newchiral 4,5,6,7-tetrahydro[1,2,3]triazolo[1,5-a]pyrazines is described from α -amino acid derivatives following intramolecular 'click' reaction as the key step. The method obviates product -purification; to obtain the pure triazole products, only the solvent needs to be evaporated.
SiO2–NHC–Cu(I): an efficient and reusable catalyst for [3+2] cycloaddition of organic azides and terminal alkynes under solvent-free reaction conditions at room temperature
作者:Pinhua Li、Lei Wang、Yicheng Zhang
DOI:10.1016/j.tet.2008.09.021
日期:2008.11
highly efficient catalyst for [3+2] cycloaddition of organic azides and terminal alkynes. In the presence of SiO2–NHC–Cu(I) 3b (1 mol %), the reactions of terminal alkynes with organic azides underwent smoothly to generate the corresponding regiospecific 1,4-disubstituted 1,2,3-triazoles in excellent yields under solvent-free reaction conditions at room temperature. Furthermore, catalyst 3b was quantitatively