Exploiting the dual role of ethynylbenziodoxolones in gold-catalyzed C(sp)–C(sp) cross-coupling reactions
作者:Somsuvra Banerjee、Nitin T. Patil
DOI:10.1039/c7cc04283c
日期:——
Reported herein is the gold-catalyzed alkynylation of terminal alkynes using ethynylbenziodoxolones (EBXs), where EBXs serve a dual role as oxidants as well as alkyne transfer agents to access unsymmetrical 1,3-diynes. Hence, the catalytic system requires no externaloxidants and is compatible with a broad range of substrates, including those with polar functional groups such as NH, OH and B(OH)2.
Determining the Origin of Rate-Independent Chemoselectivity in CuAAC Reactions: An Alkyne-Specific Shift in Rate-Determining Step
作者:Ciaran P. Seath、Glenn A. Burley、Allan J. B. Watson
DOI:10.1002/anie.201612288
日期:2017.3.13
kinetic and spectroscopic analysis of alkyne‐dependent chemoselectivity in the copper‐catalyzed azide–alkyne click (CuAAC) reaction. Studies of six alkyne subtypes reveal that the rate‐determining step (RDS) of an aromatic ynamine class is shifted from acetylide formation to the azide ligation/migratory insertion event allowing chemoselectivity independent of overall rate.
We have synthesized a new series of 1,2,3-triazolo piperazine and piperidine carboxylate derivatives using a simple and one-pot click chemistry with significantly reduced reaction times (~5 min) and enhanced reaction yields (~95-98%). The fourteen novel compounds thus synthesized were tested for ability to target GPR119, a G-protein coupled target receptor that plays critical role in regulation of
Relative Performance of Alkynes in Copper-Catalyzed Azide–Alkyne Cycloaddition
作者:Alexander A. Kislukhin、Vu P. Hong、Kurt E. Breitenkamp、M. G. Finn
DOI:10.1021/bc300672b
日期:2013.4.17
Copper-catalyzed azide-alkyne cycloaddition (CuAAC) has found numerous applications in a variety of fields. We report here only modest differences in the reactivity of various classes of terminal alkynes under typical bioconjugative and preparative organic conditions. Propargyl compounds represent an excellent combination of azide reactivity, ease of installation, and cost. Electronically activated propiolamides are slightly more reactive, at the expense of increased propensity for Michael addition. Certain alkynes, including tertiary propargyl carbamates, are not suitable for bioconjugation due to copper-induced fragmentation. A fluorogenic probe based on such reactivity is available in one step from rhodamine 110 and can be useful for optimization of CuAAC conditions.
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