Green, efficient and practical Michael addition of arylamines to α,β-unsaturated ketones
作者:Ran Jiang、Dan-Hua Li、Jing Jiang、Xiao-Ping Xu、Tao Chen、Shun-Jun Ji
DOI:10.1016/j.tet.2011.03.082
日期:2011.5
The aza-Michael addition of aromatic amines to alpha,beta-unsaturated ketones was carried out effectively at room temperature in good to excellent yields without any catalyst or solvent. It was significant that part of adducts could be collected in almost quantitative yield without column chromatography. This procedure offered a green, efficient, and practical approach for the synthesis of beta-amino ketones. (C) 2011 Elsevier Ltd. All rights reserved.
[HP(HNCH2CH2)3N]NO3: an efficient homogeneous and solid-supported promoter for aza and thia-Michael reactions and for Strecker reactions
作者:Brandon M. Fetterly、Nirmal K. Jana、John G. Verkade
DOI:10.1016/j.tet.2005.09.117
日期:2006.1
In the presence of a catalytic amount of an azaphosphatrane nitrate salt, amines and thiols react readily with Michael acceptors. The salt is also an efficient promoter for the one pot synthesis of alpha-amino and alpha-amidonitriles. By anchoring the salt to Merrifield Resin, a reusable heterogeneous catalyst is obtained for these reactions. Evidence is presented for catalysis being attributable solely to the NO3- ion. (c) 2005 Elsevier Ltd. All rights reserved.
Palladium-Catalyzed Aerobic Oxidative Coupling of Allylic Alcohols with Anilines in the Synthesis of Nitrogen Heterocycles
with anilines to afford β-amino ketones which are converted into substituted quinolines in a one-pot fashion. The exclusive preference for N-alkylation over N-allylation makes this approach unique when compared to those reported in literature. Detailed mechanistic investigations reveal that the conjugate addition pathway was the predominant one over the allylic amination pathway. The notable aspects of
Cobalt-Porphyrin-Catalyzed Intramolecular Buchner Reaction and Arene Cyclopropanation of In Situ Generated Alkyl Diazomethanes
作者:Haixu Wang、Cong-Ying Zhou、Chi-Ming Che
DOI:10.1002/adsc.201700205
日期:2017.7.3
Cobalt(II)‐porphyrin catalyzed intramolecular Buchner reaction and arene cyclopropanation of alkyl diazomethanes generated in situ from N‐tosylhydrazones gave a range of bicyclic cycloheptatriene fused pyrrolidines and tetracyclic cyclopropane fused pyrrolidines in good to high yields and with high chemo‐ and regioselectivities. The obtained cyclopropane fused pyrrolidines can be readily converted