Volodymyr A. Sukach

Novel Potent Orthosteric Antagonist of ASIC1a Prevents NMDAR-Dependent LTP Induction.

Acid sensing ion channels 1a (ASIC1a) are of crucial importance in numerous physiological and pathological processes in the brain. Here we demonstrate that novel 2-oxo-2H-chromene-3-carboxamidine derivative 5b, designed with molecular modeling approach, inhibits ASIC1a currents with an apparent IC50 of 27 nM when measured at pH 6.7. Acidification to 5.0 decreases the inhibition efficacy by up to 3 orders of magnitude. The 5b molecule not only shifts pH dependence of ASIC1a activation but also inhibits its maximal evoked response. These findings suggest that compound 5b binds to pH sensor of ASIC1a acting as orthosteric noncompetitive antagonist. At 100 nM, compound 5b completely inhibits induction of long-term potentiation (LTP) in CA3-CA1 but not in MF-CA3 synapses. These findings support the knockout data indicating the crucial modulatory role of ASIC1a channels in the NMDAR-dependent LTP and introduce a novel type of ASIC1a antagonists.

Synthesis of (7S)-(−)-7-aryl-5-methyl-7-trifluoromethyl-1,3,6,7-tetrahydro-2H-1,4-diazepin-2-ones

Acylation of (S)-(−)-4-amino-4-aryl-5,5,5-trifluoropentan-2-ones with chloroacetyl chloride gave the corresponding chloroacetamides which were treated with sodium azide and then with triphenylphosphine to obtain triphenyl-λ5-phosphanylideneaminoacetic acid amides. The latter underwent thermal (boiling toluene) or base-catalyzed (NaOH/MeOH) intramolecular cyclization with elimination of triphenylphosphine oxide and formation of (7S)-(−)-7-aryl-5-methyl-7-trifluoromethyl-1,3,6,7-tetrahydro-2H-1,4-diazepin-2-ones.

Heterocyclization of functionalized heterocumulenes with C,N-, C,O-, and C,S-Binucleophiles: XI. Synthesis of dialkyl 2-oxo-3,6-diaryl-1,2,3,6-tetrahydropyrimidine-4,5-dicarboxylates by cyclocondensation of 1-chlorobenzyl isocyanates with dialkyl anilinofumarates

Abstract1-Chlorobenzyl isocyanates react with N-arylfumarates with the formation of dialkyl 2-oxo-3,6-diaryl-1,2,3,6-tetrahydropyrimidine-4,5-dicarboxylates that on alkaline hydrolysis are converted into 6-alkoxycarbonyl-1,4-diaryl-2-oxo-1,2,3,4-tetrahydropyrimidine-5-carboxylic acids. The condensation of 1-chloro-1-phenyl-2,2,2-trifluoroethyl isocyanate with N-arylfumarates results in dialkyl 6-oxo-2,3-diaryl-2-trifluoromethyl-1,2,3,6-tetrahydropyrimidine-4,5-dicarboxylates.

Asymmetric organocatalytic mannich reaction of 1-aryl-2,2,2-trifluoroethylidenecarbamic acid derivatives with acetone

Mannich reactions of ethyl 1-aryl-2,2,2-trifluoroethylidenecarbamates and ureas with acetone in the presence of L-proline gave 1-aryl-3-oxo-1-(trifluoromethyl)butylcarbamates and ureas with an enantiomeric excess of 24–54%.

N-Benzyloxycarbonyl-2,2,2-trifluoroacetimidoyl chloride—A convenient reagent for the synthesis of 2-trifluoromethyl-4H-pyrido[1,2-a][1,3,5]triazin-4-one

N-Benzyloxycarbonyl-2,2,2-trifluoroacetimidoyl chloride reacted with pyridin-2-amine derivatives to form substituted 2-trifluoromethyl-4H-pyrido[1,2-a][1,3,5]triazin-4-ones.

Synthesis of (S)-(-)-1,4-diaryl-6-methyl-4-trifluoromethyl-3,4-dihydropyrimidine-2(1H)-thiones

Abstract(S)-(+)-4-Amino-4-aryl-5,5,5-trifluoropentan-2-one reacted with aryl isothiocyanates containing electron-withdrawing substituents to give (S)-(−)-1,4-diaryl-6-methyl-4-trifluoromethyl-3,4-dihydropyrimidine-2(1H)-thiones.

Synthesis of (S)-(+)-6-aryl-3-acetyl-6-trifluoromethyl-5,6-dihydropyridin-2(1H)-ones

Abstract(S)-(+)-4-Amino-4-aryl-5,5,5-trifluoropentan-2-ones reacted with ethyl acetoacetate and ethyl trifluoroacetoacetate to give (S)-(+)-6-aryl-3-acetyl(or trifluoroacetyl)-6-trifluoromethyl-5,6-dihydropyridin-2(1H)-ones.

Trifluoromethyl-containing 3,4-dihydropyrimidine-2-ones and their condensed analogs

В огляді систематизовані та проаналізовані літературні джерела, які стосуються методів одержання 4- та 6-трифторометил-3,4-дигідропіримідин-2-онів та їх конденсованих похідних як перспективних молекулярних платформ для синтезу біоактивних сполук. Відзначена роль міжмолекулярних та внутрішньомолекулярних циклоконденсацій CF3-вмісних субстратів, а також реакцій приєднання С-нуклеофілів до C=N зв’язку CF3-вмісних 3,4-дигідропіримідонів як ключових методологічних підходів до конструювання 4-трифторометильованих похідних. Важливе місце відведене способу побудови трифторометилдигідропіримідонів високої оптичної чистоти та їх тіоаналогів, в основі якого лежить конденсація хіральних сечовин або тіосечовин. Значна увага приділена опису асиметричних реакцій, які приводять до синтезу хіральних аналогів анти-ВІЛ препарату Ефавіренц. Констатовано, що найбільш розповсюдженим варіантом отримання 6-трифторометилпіримідонів є реакція Біджинеллі відповідних фторовмісних кетоестерів. Метод дозволяє отримати цільові продукти в одну стадію, хоча і має обмеження, обумовлені потребою виділення проміжних циклічних продуктів, які в подальшому необхідно піддавати процесу дегідратації. Проаналізовано вплив природи каталізатора на перебіг реакції Біджинеллі за участю CF3-вмісних кетоестерних субстратів. Показана перспективність використання реакції 3,6-приєднання до 4-CF3-дигідропіримідонів для синтезу похідних дигідрооротової кислоти.

The addition of β-ketoacids to 4-(trifluoromethyl)pyrimidin- 2(1 Н )-ones with decarboxylation: an effective method for the synthesis of 4-(2-oxoalkyl)-6-(trifluoromethyl)-3,4-dihydropyrimidin-2-ones

β-Ketoacids reacted with 4-(trifluoromethyl)pyrimidin-2(1Н)-ones according to the mechanism of Michael addition–decarboxylation, forming 4-(2-oxoalkyl)-6-(trifluoromethyl)-3,4-dihydropyrimidin-2-ones.

Regioselective decarboxylative addition of malonic acid and its mono(thio)esters to 4-trifluoromethylpyrimidin-2(1H)-ones

Background: Due to the high reactivity towards various C-nucleophiles, trifluoromethylketimines are known to be useful reagents for the synthesis of α-trifluoromethylated amine derivatives. However, decarboxylative reactions with malonic acid and its mono(thio)esters have been poorly investigated so far despite the potential to become a convenient route to β-trifluoromethyl-β-amino acid derivatives and to their partially saturated heterocyclic analogues. Results: In this paper we show that 4-trifluoromethylpyrimidin-2(1H)-ones, unique heterocyclic ketimines, react with malonic acid under organic base catalysis to regioselectively provide either Michael- or Mannich-type decarboxylative addition products depending on solvent polarity. Malonic mono(thio)esters give exclusively Michael-type products. The two regioisomeric products can be converted into saturated (2-oxohexahydropyrimidin-4-yl)acetic acid derivatives by mild hydrogenation of the endocyclic C=C double bond in the presence of Pd/C as catalyst. The cis-stereoisomers selectively formed upon reduction of the Michael-type products were structurally determined by X-ray diffraction. As a result of this study, a number of novel acetic acid derivatives containing trifluoromethylated, partially or fully saturated 2-oxopyrimidine cores were prepared and characterized as promising building blocks. Conclusions: Regio- and stereoselective protocols have been developed for the synthesis of novel isomeric 4(6)-trifluoromethylated 1,2,3,4-tetrahydro- and perhydro-(2-oxopyrimidin-4-yl)acetic acid derivatives.