Synthesis of 2-Aminoindolizines by 1,3-Dipolar Cycloaddition of Pyridinium Ylides with Electron-Deficient Ynamides
作者:Julien Brioche、Christophe Meyer、Janine Cossy
DOI:10.1021/acs.orglett.5b01205
日期:2015.6.5
possessing an ynoate or an ynone moiety, have been successfully involved for the first time in a 1,3-dipolarcycloaddition with stabilized pyridiniumylides. These reactions afford an efficient and general access toward a variety of substituted 2-aminoindolizines which can serve as useful precursors for the synthesis of other more complex nitrogen heterocycles.
Indolizine derivatives, with pharmaceutical activity
申请人:Elf Sanofi
公开号:US05403933A1
公开(公告)日:1995-04-04
The invention relates to indolizine derivatives of general formula: ##STR1## in which: X denotes an --S or --SO.sub.2 -- group, each of R.sub.1 and R.sub.2, which are identical or different, denotes hydrogen, the methyl or ethyl radical or a halogen atom, R.sub.3 denotes hydrogen or a C.sub.1 -C.sub.4 alkyl radical, R.sub.4 denotes a precursor radical of a carboxyl group, R denotes a C.sub.1 -C.sub.6 alkyl, C.sub.3 -C.sub.6 cycloalkyl or phenyl radical, and their use as intermediates for the preparation of pharmaceutically active aminoalkoxybenzenesulphonylindolizine derivatives.
Synthesis and properties of new heterocyclic betaines: 4-Aryl-5-(methoxycarbonyl)-2-oxo-3-(pyridin-1-ium-1-yl)-2,3-dihydro-1 H -pyrrol-3-ides
作者:Liya D. Funt、Mikhail S. Novikov、Galina L. Starova、Alexander F. Khlebnikov
DOI:10.1016/j.tet.2018.03.071
日期:2018.5
3-dihydro-1H-pyrrol-3-ides, were synthesized in good yields by the reaction of alkyl 2H-azirine-2-carboxylates with 2-methoxy-2-oxo-1-(pyridin-1-ium-1-yl)ethan-1-ides, generated from the corresponding pyridiniumsalts. The betaines exist as the NH-tautomers both in solution and in the solid state. Two molecules of the betaine form a dimer by hydrogen bonds of the type NH⋯O in solid state. According to TD DFT
Synthesis and Characterization of γ-Heteroaryl-substituted Pentamethine Cyanine Dyes with Carboxy or Methoxycarbonyl Substituents at the Two Heterocyclic End Groups
作者:A. M. Mehranpour、S. Hashemnia、F. Azamifar
DOI:10.1002/jhet.1816
日期:2014.9
Seven novel pentamethinecyaninedyes with 3,5‐dimethylpyridinium‐1‐yl, pyridinium‐1‐yl, and 1‐quinolinum‐1‐yl substituents in the γ position of the methine chain containing ester or carboxylic acid groups in the ring of the dyes were synthesized via a three‐step procedure. The visible spectral behavior of the pentamethinecyaninedyes was examined in DMSO. Elemental analysis, IR, 1H‐NMR, 13C‐NMR,