Vanadium(IV) acetylacetonate catalyzed stereoselective synthesis of β-enaminoesters and β-enaminones
作者:Rajibul A. Laskar、Naznin A. Begum、Mohammad Hedayetullah Mir、Shahzad Ali、Abu T. Khan
DOI:10.1016/j.tetlet.2012.11.051
日期:2013.1
and stereoselective procedure has been described for the synthesis of a series of β-enaminoesters and β-enaminones by vanadium(IV) acetylacetonate [VO(acac)2] catalyzed reaction of β-ketoesters and 1,3-diketones with both aliphatic and aromatic amines. X-ray crystallographicstudies of some representative compounds corroborate two types of structural geometry formed by inter-molecular as well as intra-molecular
Lewis Acid-Mediated Reactions of Alkyl Azides with α,β-Unsaturated Ketones
作者:D. Srinivasa Reddy、Weston R. Judd、Jeffrey Aubé
DOI:10.1021/ol0355130
日期:2003.10.1
[reaction: see text] Alkyl azides react with saturated ketones upon treatment with Lewisacids to afford ring-expansion products through the azido-Schmidt reaction, but this reaction does not proceed when alpha,beta-unsaturated ketones are used. In this study, alkyl azides were reacted with enones in the presence of Lewisacids to give enaminones (vinylogous amides), which formally involve a ring contraction
Synthesis and anticonvulsant activity of enaminones. 2. Further structure-activity correlations
作者:K. R. Scott、Ivan O. Edafiogho、Erica L. Richardson、Vida A. Farrar、Jacqueline A. Moore、Elizabeth I. Tietz、Christine N. Hinko、Hyejung Chang、Afif El-Assadi、Jesse M. Nicholson
DOI:10.1021/jm00066a003
日期:1993.7
shown to be safer alternatives, the most notable was methyl 4-[(p-bromophenyl)amino]-6-methyl-2-oxocyclohex-3-en-1-oate, 13. Compound 13 had an ip ED50 of 4 mg/kg in the rat and a TD50 of 269 mg/kg, providing a protective index (TD50/ED50) of > 67. By variation in the ring size, additional aromatic substitutions and the synthesis of acyclic analogs, these newer compounds provide a more definitive insight
among a range of catalytically relevant enamines. Spin population analysis disclosed that enamine radical cations mainly exhibit the carbon-center free radical feature. Taking experimental and computation data together, a comprehensive picture about the redox property of enamines is presented, which would provide guidance in the development of oxidative enamine catalysis and transformations.
Cu catalyzed cross-dehydrogenative coupling reaction for the synthesis of 3-hydroxy-2-pyrrolidinones
作者:Rajib Sarkar、Chhanda Mukhopadhyay
DOI:10.1016/j.tetlet.2018.06.061
日期:2018.8
regioselective CC coupling has been developed. This is a Cu (II) catalyzed cross dehydrogenative coupling (CDC) involving enamino-ketones of benzyl amines and di-alkyl acetylenedicarboxylate, followed by cyclization by primary amines. TBHP (tert-butyl hydroperoxide) has been used as the oxidant to promote the coupling protocol. This synthetic route principally demonstrates the scope of CDC reaction and also