2-, 3-, or 4-Pyridylmethyl radicals can be made to add to nonactivated alkenes to give a variety of otherwise inaccessible pyridine derivatives. Bicyclic structures can be obtained by combining the radical addition with ionic ring-closure steps.
Rhodium(iii)-catalyzed oxidative olefination of N-allyl sulfonamides
作者:Shui Hu、Dongqi Wang、Jiexiang Liu、Xingwei Li
DOI:10.1039/c3ob40272j
日期:——
Rhodium(III)-catalyzed oxidative couplings between N-sulfonyl allylamines and activated olefins have been achieved. Only olefination occurred for acrylates, and the butadiene product can be further cyclized under palladium-catalyzed aerobic conditions. The coupling with N,N-dimethylacrylamide followed a cyclization pathway.
Synthesis of Diverse Macrocyclic Peptidomimetics Utilizing Ring-Closing Metathesis and Solid-Phase Synthesis
作者:Anthony G. M. Barrett、Alan J. Hennessy、Ronan Le Vézouët、Panayiotis A. Procopiou、Peter W. Seale、Stefan Stefaniak、Richard J. Upton、Andrew J. P. White、David J. Williams
DOI:10.1021/jo0352629
日期:2004.2.1
The synthesis of a range of highly functionalized peptidomimetic macrocycles has been accomplished using ring-closing metathesis and enyne tandem cross-metathesis−ring-closing metathesis reactions. This approach gives access to rigidified macrocycles modeled on the structures of cyclic peptides and designed to be biologically stable. The potential for peripheral functionalization of these templates
Carbonic Anhydrases inhibitory effects of new benzenesulfonamides synthesized by using superacid chemistry
作者:Fei Liu、Agnès Martin-Mingot、F. Lecornué、Marie-Paule Jouannetaud、Alfonso Maresca、Sebastien Thibaudeau、Claudiu T. Supuran
DOI:10.3109/14756366.2011.638921
日期:2012.12.1
A series of benzofused sultams and fluorinatedbenzenesulfonamides were synthesized in superacid HF/SbF(5) from simple N-allylic derivatives. Almost all of these original compounds showed micromolar inhibitory activities against carbonicanhydrases I and II. The fluorinated derivatives inhibit better the tumor-associated isoforms IX and XII, and one of the tested compounds showed inhibition in the
Ring-Expansion Reactions of Epoxy Amides and Enamides: Functionalized Azetidines, Dihydrofurans, Diazocanes, or Dioxa-3-azabicyclonon-4-enes?
作者:Suraj、K. C. Kumara Swamy
DOI:10.1021/acs.joc.2c00268
日期:2022.5.20
3-dihydrofurans, or the unorthodox dioxa-3-azabicyclonone-4-ene motifs are the products from transition metal-free reaction between N-oxiranylmethyl benzenesulfonamide and β-chloro-cinnamaldehyde, depending on whether one uses either NaI/K2CO3 or LiBr/K2CO3. These ring expansion reactions involve enamide (X-ray evidence) derived from N-oxiranylmethyl benzenesulfonamide and β-chloro-cinnamaldehyde as
功能化的氮杂环丁烷、2,3-二氢呋喃或非正统的二氧杂环己烷-3-氮杂双环酮-4-烯基序是N-环氧乙烷基甲基苯磺酰胺和 β-氯-肉桂醛之间的无过渡金属反应的产物,具体取决于是否使用 NaI /K 2 CO 3或 LiBr/K 2 CO 3。这些扩环反应涉及衍生自N-环氧乙烷基甲基苯磺酰胺和 β-氯肉桂醛作为中间体的烯酰胺(X 射线证据) 。N-环氧乙烷基甲基苯磺酰胺本身在加热时产生易于分离的结晶异构重氮杂环烷,其可通过X-射线晶体学表征。