Synthesis and characterization of fluorescent 4,6-disubstituted-3-cyano-2-methylpyridines
摘要:
4,6-Disubstituted-3-cyano-2-methylpyridines, easily prepared by treating alpha,beta-unsaturated carbonyl compounds with beta-aminocrotononitrile in the presence of potassium tert-butoxide, have been found to show intense fluorescence in the region of 400-552 nm. 3-Cyano-4,6-bis(4-methoxyphenyl)-and 3-cyano-4,6-di(2-furyl)-2-methylpyridines show more intense fluorescence than 7-diethylamino-4-methylcoumarin. The 3-cyano group of pyridines increases the fluorescence intensities and improves photostabilities.
Polymer-supported preparation of substituted phenols: A new example of simultaneous cyclization-cleavage reaction on solid phase
作者:Alan R Katritzky、Sergei A Belyakov、Yunfeng Fang、John S Kiely
DOI:10.1016/s0040-4039(98)01771-7
日期:1998.10
A series of variously substituted phenols was synthesized in high yields using the “cyclization-cleavage” approach. Base-catalyzed reactions between α,β-unsaturated ketones and polymer-bound acetonyl groups result in a tandem Michael addition/annulation reaction followed by elimination and rearrangement into phenols. Since all intermediates are on the resin until the last stage, the final reaction
Development of the juliá asymmetric epoxidation reaction. Part 1. Application of the oxidation to enones other than chalcones
作者:M. Elena Lasterra-Sánchez、Ulfried Felfer、Patrick Mayon、Stanley M. Roberts、Steven R. Thornton、Christine J. Todd
DOI:10.1039/p19960000343
日期:——
Asymmetric epoxidation of a variety of enones 3, 6, 8, 10, 12, 14, 16, 18, 21, 22, 26, 28-30 and 36 gives the corresponding oxiranes in good to excellent yield and optical purity, The oxidation medium consists of basic peroxide or sodium perborate or sodium percarbonate or tert-butylhydroperoxide and the preferred catalyst is polyleucine, conveniently prepared from the N-carboxyanhydride using 1,3-diaminopropane.
Pallaud; Delaveau, Comptes Rendus Hebdomadaires des Seances de l'Academie des Sciences, 1953, vol. 237, p. 1254
作者:Pallaud、Delaveau
DOI:——
日期:——
KATSOBASHVILI, YA. R.;KACHALOVA, V. B.;TSODIKOV, M. V.;KOSHEVNIK, A. YU.;+, IZV. AN CCCP. CEP. XIM., 1981, N 12, 2761-2764
作者:KATSOBASHVILI, YA. R.、KACHALOVA, V. B.、TSODIKOV, M. V.、KOSHEVNIK, A. YU.、+
DOI:——
日期:——
NASIPURI D.; KONAR S. K., J. INDIAN CHEM. SOC., 1978, 55, NO 6, 580-583