Amberlite IRA900N3 is an excellent organocatalyst for the azidation of α,β-unsaturated ketones with trimethylsilyl azide under solvent-free conditions. By avoiding the use of metallic species and of the organic reaction medium, the procedure is a green tool for the preparation of β-azido ketones under mild conditions with yields from good to excellent. The catalyst can be recovered and re-used with
An Efficient and General Approach to β-Functionalized Ketones
作者:Jingliang Jiao、Larry X. Nguyen、Dennis R. Patterson、Robert A. Flowers
DOI:10.1021/ol070159h
日期:2007.3.1
cyclopropyl alcohols provides a novel approach to beta-functionalized ketones. The protocol has a number of advantages including short reaction times, ease of reagent handling, and mild, neutral reaction conditions. Overall, this method provides an alternative pathway to important starting materials and intermediates in organic synthesis.
C–H Azidation is an increasingly important tool for bioconjugation, materials chemistry, and the synthesis of nitrogen-containing natural products. While several approaches have been developed, these often require exotic and energetic reagents, expensive photocatalysts, or both. Here we report a simple and general C–H azidation reaction using earth-abundant tetra-n-butylammonium decatungstate as a
Simple, catalytic C(sp3)–H azidation using the C–H donor as the limiting reagent
作者:James F. Hooson、Hai N. Tran、Kang-Jie Bian、Julian G. West
DOI:10.1039/d3cc04728h
日期:——
direct C(sp3)–H azidation using iron or manganese catalysis and a nucleophilic azide source. All reagents are commercially available, the experimental procedure is simple, and we can use the C–H donor substrate as the limiting reagent, a challenge for many C–H azidation methods. Preliminary experiments are consistent with a hydrogen atom transfer (HAT)/radical ligand transfer (RLT) radical cascade mechanism