Synthesis of dihydropyrimidine α,γ-diketobutanoic acid derivatives targeting HIV integrase
摘要:
The synthesis and antiviral evaluation of a series of dihydropyrimidinone and thiopyrimidine derivatives bearing aryl alpha, gamma-diketobutanoic acid moiety are described using the Biginelli multicomponent reaction as key step. The most active among 20 synthesized novel compounds were 4c, 4d and 5b, which possess nanomolar HIV-1 integrase (IN) stand transfer (ST) inhibition activities. In order to understand their mode of interactions within the IN active site, we docked all the compounds into the previously reported X-ray crystal structure of IN. We observed that compounds 4c, 4d and 5b occupied an area close to the two catalytic Mg2+ ions surrounded by their chelating triad (E221, D128 and D185), DC16, Y212 and the beta-diketo acid moiety of 4c, 4d and 5b chelating Mg2+. As those compounds lack anti-HIV activities in cell, their prodrugs were synthetized. The prodrug 4c' exhibited an anti-HIV activity of 0.19 mu M in primary human lymphocytes with some cytotoxicity. All together, these results indicate that the new analogs potentially interact within the catalytic site with highly conserved residues important for IN catalytic activity. (C) 2015 Elsevier Masson SAS. All rights reserved.
A new approach to the synthesis of Biginelli compounds
摘要:
A new synthesis of 4-aryl-2-oxo-1,2,3,4-tetrahydropyrimidine-5-carboxylic acid esters is based on the reactions of alpha-tosyl-substituted phenyl carbamates with the enolates of beta-oxoesters followed by treatment with ammonia and dehydration of the resulting 4-hydroxyhexahydropyrimidin-2-ones.
Selective acylation of 5-nitro- and 5-ethoxycarbonyl-4,6-diaryl-3,4-dihydropyrimidin-2(1H)-ones
作者:V. F. Sedova、O. P. Shkurko
DOI:10.1134/s1070428010110163
日期:2010.11
The acetylation and chloroacetylation of 5-nitro- and 5-ethoxycarbonyl-substituted 4,6-diaryl-3,4-dihydropyrimidin-2(1H)-ones proceeds regioselectively at the N3 atom of the heterocycle whereas the acetylation of the 5-aryloxy-substituted analog results in a mixture of N1- and N3-acetylated regioisomers.
An unusual oxidation–dealkylation of 3,4-dihydropyrimidin-2(1H)-ones mediated by Co(NO3)2·6H2O/K2S2O8 in aqueous acetonitrile
作者:Pachaiyappan Shanmugam、Paramasivan T. Perumal
DOI:10.1016/j.tet.2006.11.010
日期:2007.1
4-Aryl-6-methyl-3,4-dihydropyrimidin-2(1H)-one (DHPM) scaffolds of Biginelli type were oxidized using Co(II)/S2O82- and the reaction afforded 6-unsubstituted pyrimidin-2(1H)-ones through an unprecedented dealkylation process. 4-Alkyl DHPMs under similar conditions afforded yet another unusual product, ethyl tetrahydropyrimidin-2,4(1H,3H)-dione-5-carboxylate. (c) 2006 Elsevier Ltd. All rights reserved.
Regioselective dehydrogenation of 3,4-dihydropyrimidin-2(1H)-ones mediated by ceric ammonium nitrate
作者:P. Shanmugam、P.T. Perumal
DOI:10.1016/j.tet.2006.07.063
日期:2006.10
Ceric ammonium nitrate (CAN) has been explored for the regioselective oxidation of 3,4-dihydropyrimidin-2(1H)-ones (DHPMs). Interestingly, we obtained ethyl 2,4-dioxo-6-phenyl-tetrahydropyrimidin-5-carboxylates as the major products during the oxidation of DHPMs by CAN/AcOH at 80 degrees C. The reaction afforded a mixture of products while employing CAN in organic solvents without additives. However, the regioselective dehydrogenated product, ethyl 6-methyl-4-aryl(alkyl)-pyrimidin-2(1H)-one-5-carboxylate was obtained by performing the reaction with NaHCO3. The single crystal X-ray crystallography of ethyl 6-methyl-4-(2-phenyl)-pyrimidin-2(1H)-one-5-carboxylate revealed that the oxidized product existed in amidic form rather than aromatized enol form of pyrimidines. The efficiency of the present protocol enabled the synthesis of structurally diverse pyrimidines in moderate to good yields under milder reaction conditions. (c) 2006 Elsevier Ltd. All rights reserved.