Photoinduced decarboxylative azidation of cyclic amino acids
作者:David C. Marcote、Rosie Street-Jeakings、Elizabeth Dauncey、James J. Douglas、Alessandro Ruffoni、Daniele Leonori
DOI:10.1039/c8ob02702a
日期:——
The direct decarboxylative azidation of cyclic α-amino acids has been achieved via visible light-mediated organo-photoredox catalysis. This synthetic strategy allows the simple preparation of azide-contaning building blocks and has been used in the selective modification of N-terminal proline residues of two di-peptides.
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
Decarboxylative Radical Azidation Using MPDOC and MMDOC Esters
作者:Erich Nyfeler、Philippe Renaud
DOI:10.1021/ol702832x
日期:2008.3.1
An efficient radical-mediated decarboxylative azidation of aliphatic carboxylic acids has been developed. The success of this transformation hinges on the use of a new type of thiohydroxamate esters (MPDOC esters). These esters are more stable than the classical Barton esters and less prone to rearrange under radical conditions. In the case of alpha-alkoxy and alpha-amino acids, optimal results are obtained with the even more stable MMDOC esters developed recently by Kim.
Magnus, Philip; Hulme, Christopher; Weber, Wolfgang, Journal of the American Chemical Society, 1994, vol. 116, # 10, p. 4501 - 4502
作者:Magnus, Philip、Hulme, Christopher、Weber, Wolfgang
DOI:——
日期:——
Synthesis of Aliphatic Azides by Photoinduced C(sp3)–H Azidation
A photoinduced synthesis of aliphatic azides was achieved in a single step starting from the parent cyclic alkanes, as well as from tetrahydrofuran and pyrrolidine derivatives. The reaction proceeds via direct azidation of C(sp(3))-H bonds in the presence of 4-benzoylpyridine under photoirradiation conditions utilizing tosyl azide as the azide source. The chemoselective C-H mono-azidation at room temperature and the formation of azide compounds in spite of their potential photolability are the key features of the present transformation.