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
A chemo- and regiocontrolled approach to bipyrazoles and pyridones<i>via</i>the reaction of ethyl 5-acyl-4-pyrone-2-carboxylates with hydrazines
作者:D. L. Obydennov、L. R. Khammatova、O. S. Eltsov、V. Y. Sosnovskikh
DOI:10.1039/c7ob02725g
日期:——
Chemo- and regiocontrolled syntheses of pyrazoles and pyridones are presented on the basis of 4-pyrones. A novel approach towards highly functionalized 3,4′-bipyrazoles has been developed by using reactions of ethyl 5-acylcomanoates with hydrazines. The acid-promoted double cyclocondensation allows switching of the structure of the pyrazole rings easily through changing both the nature of hydrazine
ROSS W. J.; TODD A.; CLARK B. P.; MORGAN S. E.; BALDWIN J. E., TETRAHEDRON LETT., 1981, 22 NO 23, 2207-2208
作者:ROSS W. J.、 TODD A.、 CLARK B. P.、 MORGAN S. E.、 BALDWIN J. E.
DOI:——
日期:——
Processes for Preparing Dolutegravir and Cabotegravir and Analogues Thereof
申请人:Lek Pharmaceuticals d.d.
公开号:US20170368040A1
公开(公告)日:2017-12-28
The present invention relates to processes for preparing substances with antiviral activity, in particular the integrase inhibitors dolutegravir and cabotegravir and analogues thereof, as well as intermediates useful in the processes.