<i>sp</i>
2-C-H Acetoxylation of Diversely Substituted (<i>E</i>
)-1-(Arylmethylene)-2-phenylhydrazines Using PhI(OAc)<sub>2</sub>
as Acetoxy Source at Ambient Conditions
作者:Goutam Brahmachari、Indrajit Karmakar
DOI:10.1002/ejoc.201900994
日期:2019.9.15
It's Simple! Catalyst‐ and additive‐free regioselective direct sp2 C–H acetoxylation of biologically interesting aldehyde hydrazones to access a new series of hydrazone acetates has been achieved. The reaction proceeds at ambient temperature employing PIDA as an acetoxy source.
BF3·OEt2 catalyzed base-free regiospecific ring opening of N-activated azetidines with (E)-1-arylidene-2-arylhydrazines
作者:Ranadeep Talukdar
DOI:10.1007/s13738-018-1489-6
日期:2019.1
for synthesis of larger molecules. The first report of regiospecific addition of hydrazones to the benzylic position of aryl azetidines to afford high yields of important hydrazonyl amine derivatives is described herein. A new C–N bond forms in this reaction scheme. The reactions proceed at stellar rates in presence of only 5 mol% of BF3·OEt2 Lewis acid without the need of any base. The reaction requires
Efficient Synthesis of Fully Substituted and Diversely Functionalized Pyrazoles through <i>p</i>‐TSA Catalyzed One‐Pot Condensation of Cyclic <i>β</i>‐Diketones, Arylglyoxals and Arylhydrazones
作者:Arun Dhurey、Subhro Mandal、Animesh Pramanik
DOI:10.1002/ejoc.202300770
日期:2023.10.21
An acid catalyzed one-pot condensation of readily available cyclic β-diketones, arylglyoxals and arylhydrazones produces a library of diverselyfunctionalized pyrazole derivatives in excellent yield under metal-catalyst-free benign conditions.