Copper(II) triflate doubly catalyzed the substitution of benzylic acetates by TMSN3 and the subsequent 1,3-dipolar addition with an alkyne in one pot. This procedure afforded the preparation of 1,4-disubstituted 1,2,3-triazoles in good yields starting from the easily accessible acetates without isolating an organic azide using a single catalyst.
One-pot Green Synthesis of Azides from Alcohols Using Brønsted Acidic Ionic Liquid [HMIM][BF<sub>4</sub>] as Solvent and Catalyst
作者:Bhaskar Garg、Yong-Chien Ling
DOI:10.1002/jccs.201400046
日期:2014.7
Brønstedacidicionicliquid, [HMIM][BF4], has been used as a non‐volatile, eco‐friendly solvent, and catalytic medium for the one‐pot greensynthesis of azidesfrom corresponding alcohols. The [HMIM][BF4] showed high reactivity than [BMIM][BF4] and [BMIM][PF6], affording azides in up to 97% yield, which could be easily separated from the reaction mixture. The ease of recyclability of [HMIM][BF4] makes
Transition-metal-free azide insertion of <i>N</i>-triftosylhydrazones using a non-metallic azide source
作者:Xueyu Li、Jin-Na Song、Swastik Karmakar、Ying Lu、Ye Lv、Peiqiu Liao、Zhaohong Liu
DOI:10.1039/d2cc05442f
日期:——
Benzylic azides, an important class of active organic synthons, were synthesized in high yields from the easily accessible N-triftosylhydrazones with stable TMSN3 under mild conditions. The reaction features high efficiency and excellent functional group tolerance, as illustrated by gram-scale synthesis and the synthesis of drug-like molecules. Mechanistic studies reveal that azidation occurs at the
苄基叠氮化物是一类重要的活性有机合成子,在温和条件下从易于获得的具有稳定 TMSN 3的N -triftosylhydrazone 以高产率合成。该反应具有高效和优异的官能团耐受性,如克级合成和类药分子的合成所示。机理研究表明,通过叠氮离子消除 N 2,在缺电子的重氮碳中发生叠氮化。