Directing Group in Decarboxylative Cross-Coupling: Copper-Catalyzed Site-Selective C–N Bond Formation from Nonactivated Aliphatic Carboxylic Acids
作者:Zhao-Jing Liu、Xi Lu、Guan Wang、Lei Li、Wei-Tao Jiang、Yu-Dong Wang、Bin Xiao、Yao Fu
DOI:10.1021/jacs.6b05788
日期:2016.8.3
Copper-catalyzed directed decarboxylative amination of nonactivated aliphatic carboxylic acids is described. This intramolecular C-N bond formation reaction provides efficient access to the synthesis of pyrrolidine and piperidine derivatives as well as the modification of complex natural products. Moreover, this reaction presents excellent site-selectivity in the C-N bond formation step through the
Herein is described an efficient and chemoselective method for the synthesis of diversely substituted secondary amines in yields up to 98 %. Direct mono-N-alkylation of primary benzylamines and anilines with a wide range of alkyl halides is promoted by a cesium base in the absence of any additive or catalyst. The basicity and solubility of cesium carbonate in anhydrous N,N-dimethylformamide not only
Synthesis of Cyclic
<i>N</i>
‐Hydroxylated Ureas and Oxazolidinone Oximes Enabled by Chemoselective Iodine(III)‐Mediated Radical or Cationic Cyclizations of Unsaturated
<i>N</i>
‐Alkoxyureas
作者:Laure Peilleron、Pascal Retailleau、Kevin Cariou
DOI:10.1002/adsc.201901135
日期:2019.11.19
In this study we describe the reactivity of unsaturated N‐alkoxyureas in the presence of different combinations of a hypervalent iodine(III) reagent and a bromide source or TEMPO. Three complementary cyclizations can be achieved depending on the reaction conditions. On the one hand, PIFA with pyridinium bromide leads to an oxybromination reaction. On the other hand, bis(tert‐butylcarbonyloxy)iodobenzene
[EN] PIPERLONGUMINE ANALOGUES AND USES THEREOF<br/>[FR] ANALOGUES DE PIPERLONGUMINE ET LEURS UTILISATIONS
申请人:BIOVENTURES LLC
公开号:WO2019221755A1
公开(公告)日:2019-11-21
The present disclosure provides compositions and methods for selectively killing senescent cells, wherein the composition comprises piperlongumine derivative thereof. The selective killing of senescent cells may delay aging and/or treat age-related disorders.
with nitriles has been achieved by using rare‐earth complexes. This reaction is equivalent to the desired intramolecular hydroamination of alkenylamidines, and allows a new direct access to substituted 2‐imidazolines and tetrahydropyrimidines in high yields under operationally simple reaction conditions. Moreover, the methodology is also efficient for synthesis of symmetric and unsymmetric bridged diimidazolines