Synthesis of ethyl 4-(isoxazol-4-yl)-2,4-dioxobutanoates from ethyl 5-aroyl-4-pyrone-2-carboxylates and hydroxylamine
摘要:
Ethyl 5-aroyl-4-pyrone-2-carboxylates react with hydroxyl amine in ethanol at -20 degrees C for 30 days to produce ethyl 4-(5-arylisoxazol-4-yl)-2,4-dioxobutanoates (yields 20-67%). The similar reaction of diethyl 4-pyrone-2,5-dicarboxylate gives ethyl 4-oxo-4H-pyrano[3,4-d]isoxazole-6-carboxylate in 37% yield.
METHOD OF PRODUCING PYRONE AND PYRIDONE DERIVATIVES
申请人:Sumino Yukihito
公开号:US20120022251A1
公开(公告)日:2012-01-26
The present invention provides a pyrone derivative and a pyridone derivative, which are novel intermediates for synthesizing an anti-influenza drug, a method of producing the same, and a method of using the same.
Preparative synthesis of ethyl 5-acyl-4-pyrone-2-carboxylates and 6-aryl-, 6-alkyl-, and 5-acylcomanic acids on their basis
作者:D. L. Obydennov、A. O. Goncharov、V. Ya. Sosnovskikh
DOI:10.1007/s11172-016-1574-x
日期:2016.9
A simple and efficient method for the synthesis of ethyl 5-alkanoyl- and 5-aroyl-4-pyrone-2-carboxylates was developed, which is based on the condensation of 1-R-2-(dimethyl-aminomethylidene)butane-1,3-diones, obtained from 1,3-diketones and dimethylformamide dimethyl acetal, with diethyl oxalate in the presence of NaH in THF. Ethyl 5-acyl-4-pyrone-2-carboxylates were used in the synthesis of 6-R-
Synthesis of Diketohexenoic Acid Derivatives by Alkenylation of Indoles and Pyrroles with 4-Pyrones
作者:Dmitrii L. Obydennov、Ekaterina O. Pan’kina、Vyacheslav Y. Sosnovskikh
DOI:10.1021/acs.joc.6b02364
日期:2016.12.16
A new synthesis of functionalized (Z)-6-hetaryl-2,4-dioxo-5-hexenoic acids based on acid-catalyzed alkenylation of indoles and pyrroles with derivatives of 5-substituted 4-pyrone-2-carboxylic acid in 37–82% yields has been developed. Coupling between isochelidonic acid and indoles followed by decarboxylation afforded biologically important (E)-6-indolyl-2,4-dioxo-5-hexenoic acids. These ring-opening
SUBSTITUTED 1,2,3,4,6,8,12,12a-OCTAHYDRO-1,4-METHANODIPYRIDO[1,2-a:1',2'-d]PYRAZINES AND METHODS FOR TREATING VIRAL INFECTIONS
申请人:Gilead Sciences, Inc.
公开号:US20160176885A1
公开(公告)日:2016-06-23
Compounds for use in the treatment of human immunodeficiency virus (HIV) infection are disclosed. The compounds have the following Formula (I):
including stereoisomers and pharmaceutically acceptable salts thereof, wherein R
1
, X, W, Y
1
, Y
2
, Z
1
, and Z
4
are as defined herein. Methods associated with preparation and use of such compounds, as well as pharmaceutical compositions comprising such compounds, are also disclosed.
The Construction of Polycyclic Pyridones via Ring-Opening Transformations of 3-hydroxy-3,4-dihydropyrido[2,1-c][1,4]oxazine-1,8-diones
作者:Viktoria V. Viktorova、Elena V. Steparuk、Dmitrii L. Obydennov、Vyacheslav Y. Sosnovskikh
DOI:10.3390/molecules28031285
日期:——
This work describes the synthesis of 3-hydroxy-3,4-dihydropyrido[2,1-c][1,4]oxazine-1,8-diones, their tautomerism, and reactivity towards binucleophiles. These molecules are novel and convenient building-blocks for the direct construction of biologically important polycyclic pyridones via an oxazinone ring-opening transformation promoted with ammonium acetate or acetic acid. In the case of o-phenylenediamine