Photochemical Rearrangement of <i>N</i>-Mesyloxylactams: Stereospecific Formation of <i>N</i>-Heterocycles
作者:Alexandre Drouin、Dana K. Winter、Simon Pichette、Samuel Aubert-Nicol、Jean Lessard、Claude Spino
DOI:10.1021/jo101805q
日期:2011.1.7
N-Mesyloxylactams undergo an efficient ring-contraction to N-heterocycles of various ring sizes. Yields increase with the degree of substitution α to the carbonyl. The stereochemical information of a chiral migrating carbon is conserved making this reaction a synthetically useful complement to the well-known Hofmann, Curtius, Lossen, and Schmidt rearrangements.
Enamine chemistry. Part XI. Reaction of αβ-unsaturated acids and acid chlorides with imines. Synthesis of 2-oxotetrahydropyridines and 2-oxo-octahydroquinolines
作者:P. W. Hickmott、G. Sheppard
DOI:10.1039/j39710001358
日期:——
2-Oxotetrahydropyridines and 2-oxo-octahydroquinolines have been isolated from the reaction of acryloyl chloride with imines, together with the enamide and, in some cases, the amide. Crotonoyl and cinnamoyl chlorides give mixtures consisting mainly of the enamides. 2-Oxotetrahydropyridines and 2-oxo-octahydroquinolines have also been isolated from the reaction of acrylic acid with imines. The mechanisms
ACTION DESIMINES SUR LES MONOCHLOROPHOSPHINES: NOUVELLE VOIE D'ACCES A DES CETONES β-PHOSPHORYLEES
作者:Soufiane Touil、Hedi Zantour
DOI:10.1080/10426500108040266
日期:2001.8
Abstract The reaction of imines 1 with monochlorophosphines leads to β-phosphorylketones obtained in the ketonic 2 or enolic forms 2′. The structure of all obtained products is confirmed by NMR and IR spectroscopy.
β- and γ-lactams by nickel powder mediated 4-exo or 5-endo radical cyclisations. A concise construction of the mesembrine skeleton
作者:Jérôme Cassayre、Béatrice Quiclet-Sire、Jean-Baptiste Saunier、Samir Z. Zard
DOI:10.1016/s0040-4020(97)10204-6
日期:1998.2
N-Alkenyl trichloroacetamides, upon treatment with nickelpowder and aceticacid in refluxing 2-propanol undergo reversible 4-exo radicalcyclisation. The cyclised radical can be trapped in different ways leading to β-lactams. When the trap is omitted or not efficient enough, unusual irreversible 5-endo cyclisation occurs affording functionalised five-membered lactams. Synthesis of bicyclic γ-lactams
Extension of the Nenitzescu Reaction to Simple Ketones Provides an Efficient Route to 1‘-Alkyl-5‘-hydroxynaltrindole Analogues, Potent and Selective δ-Opioid Receptor Antagonists
作者:Shefali、Sanjay K. Srivastava、Stephen M. Husbands、John W. Lewis
DOI:10.1021/jm040853s
日期:2005.1.1
The well-established Nenitzescu reaction of imines of beta-dicarbonyl systems, as their enamine tautomers, with benzoquinone has been applied to a wide range of such imines to give 5-hydroxyindoles, some of which are of significant biological importance. This reaction has now been extended to the benzylimines of simple ketones, including those of the potent mu-opioid receptor antagonists naltrexone