Amine-catalyzed synthesis of N2-sulfonyl 1,2,3-triazole in water and the tunable N2-H 1,2,3-triazole synthesis in DMSO via metal-free enamine annulation
作者:Yanhui Guo、Yunyun Liu、Jie-Ping Wan
DOI:10.1016/j.cclet.2021.08.003
日期:2022.2
N2-H 1,2,3-triazoles via organocatalytic annulation of enaminone/enaminoester with sulfonylazide has been realized. The unconventional selectivity providing N2-sulfoyl 1,2,3-triazoles takes place in pure water, wherein the hydrogen bond effect between water and the intermediate resulting from enamine-azide corporation accounts for the novel reaction selectivity. On the other hand, the reactions conducted
Synthesis of Functionalized Pyridines via Cu(II)-Catalyzed One-Pot Cascade Reactions of Inactivated Saturated Ketones with Electron-Deficient Enamines
作者:Guang Chen、Ze Wang、Xinying Zhang、Xuesen Fan
DOI:10.1021/acs.joc.7b01901
日期:2017.10.20
In this paper, a novel and efficient synthesis of 3-acylpyridines and pyridine-3-carboxylates through the oxidative one-pot sequential reactions of inactivated saturated ketones with electron-deficient enamines is presented. Mechanistically, the formation of the title compounds involves the in situ formation of an enone intermediate through an oxidative dehydrogenation of the saturated ketone substrate
A NEW SYNTHESIS OF 1,4-DIHYDROPYRIDINE DEREVATIVES FROM FORMYL FUROCHROMONE
作者:Ν. M. Fawzy
DOI:10.1515/hc.2008.14.3.169
日期:2008.1
Condensation of equimolar ß-enaminoester (2a-d), ß-ketoester (3a-c) with formyl furochromone (1) yielded 1,4-dihydropyridine derivatives (4a-l). Oxidation of 1,4dihydropyridine derivatives (4a-c) afforded the corresponding pyridine derivatives (5a-c). Reaction of compound (1) with ß-enaminoester (2a-d) in the molar ratio (1:2) gave 1,4dihydropyridine derivatives (6a-d). Treatnent of formyl furochromone
1,4-Dihydropyridines bearing carboxy functions in the 3-, 5- and 6- or 2-, 3-, 5- and 6-positions and being substituted in the 4-position by phenyl, substituted phenyl, naphthyl, phenylalkyl or a heterocyclic group are antihypertensive agents and coronary vessel dilators. The compounds, of which 2-methyl-4-(3-nitrophenyl)-1,4-dihydropyridine-3,5,6-tricarboxylic acid triethylester is a representative embodiment, are prepared through condensation of an enamine with an ylidene acid ester, the latter being separately prepared or prepared in situ.