We herein report an iodine-mediated formal [2 + 2 + 1] cyclization of methylketones, p-toluenesulfonyl hydrazines, and 1-aminopyridinium iodide for preparation of 4-aryl-NH-1,2,3-triazoles under metal- and azide-free conditions. Notably, this is achieved using p-toluenesulfonyl hydrazines and 1-aminopyridinium iodide as azide surrogates, providing a novel route toNH-1,2,3-triazoles. Furthermore, this
The copper(I)-catalyzed azide–alkyne cycloaddition reaction has been extensively studied and widely applied in organic synthesis. However, the formation of 1,2,3-triazoles with electron-deficient azide has been a challenging problem. In this report, we have demonstrated the formation of regioselective 1,4-disubstituted 1,2,3-triazoles from various types of aryl terminal alkynes and azidoformates, which
Mesoporous Pd‐MCM‐41 catalyzed expeditious synthesis of 1,3,5‐triarylbenzenes and 4‐aryl‐NH‐1,2,3‐triazoles have been developed via denitrative cyclo‐trimerization of β‐nitrostyrenes and de‐nitrative [3+2] cycloaddition of β‐nitrostyrenes with TMSN3 respectively. The catalyst was reused at least up to eight times with minimum loss of catalytic activity.
A photolabile linker for the solid-phase synthesis of 4-substituted NH-1,2,3-triazoles
作者:Katrine Qvortrup、Thomas E. Nielsen
DOI:10.1039/c0cc05274d
日期:——
This communication presents the synthesis of a novel photolabile azidolinker based on the o-nitroveratryl group. The application of this linker for the synthesis and photolytic release of NH-1,2,3-triazoles is described.
Traceless Azido Linker for the Solid-Phase Synthesis of <i>N</i>H-1,2,3-Triazoles via Cu-Catalyzed Azide−Alkyne Cycloaddition Reactions
作者:A. Emil Cohrt、Jakob F. Jensen、Thomas E. Nielsen
DOI:10.1021/ol102209p
日期:2010.12.3
traceless azido linker for the solid-phase synthesis of NH-1,2,3-triazoles is presented. A variety of alkynes were efficiently immobilized on a range of polymericsupports by Cu(I)-mediated azide−alkyne cycloadditions. Supported triazoles showed excellent compatibility with subsequent peptide chemistry. Release of pure material (typically >95%) from the solidsupport was readily achieved by treatment with