共查询到20条相似文献,搜索用时 15 毫秒
1.
O. I. Kolodyazhnyi E. V. Grishkun A. O. Kolodyazhnaya O. O. Kolodyazhna S. Yu. Sheiko 《Russian Journal of General Chemistry》2018,88(5):919-924
Flash vacuum thermolysis of trimethylsilyl tert-butylphosphonohalidates involved elimination of halo(trimethyl)silane with the formation of tert-butyl-λ5-phosphanedione whose structure was confirmed by chemical reactions. tert-Butyl-λ5-phosphanedione readily undergoes trimerization, reacts with 2-phenyloxirane to give cycloaddition product, and takes up alcohols. 相似文献
2.
S. M. Aldoshin V. V. Tkachev K. N. Khalanskii B. S. Lukyanov V. I. Minkin A. N. Utenyshev Yu. S. Alekseenko S. O. Bezuglyi 《Russian Chemical Bulletin》2011,60(7):1380-1383
A new photochromic spiropyran of the benzoindoline series containing the quinoline moiety was synthesized. Its structure was
determined by IR and 1H NMR spectroscopy. The crystal structure of the new compound was established by X-ray diffraction. The photochromic properties
of the synthesized spiropyran were investigated. 相似文献
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V. L. Korolev V. V. Toporov N. L. Merkulova V. M. Danilenko V. P. Ivshin T. S. Pivina 《Russian Chemical Bulletin》2017,66(7):1250-1255
A method for the synthesis of imidazo[4,5-e]benzo[1,2-c;3,4-c´]difuroxanes, potential nitric oxide donors, has been developed. The synthesized compounds were characterized by IR and NMR spectroscopy, high resolution mass spectrometry, and elemental analysis. 相似文献
5.
Chiral imidazoquinazolines undergoing thermally induced reversible R ⇄ S enantiomerization have been synthesized by the interaction of 2-(o-aminophenyl)benzimidazoles with aldehydes and ketones. The benzimidazole fragment has been used for the first time as an indicator group in temperature-dependent 1H NMR spectra for determining the energy barrier of this rearrangement. The effects of nearby substituents on the kinetic and activation parameters, and on the recyclization mechanism have been investigated. 相似文献
6.
V.?R.?Akhmetova E.?M.?Bikbulatova N.?S.?Akhmadiev V.?M.?Yanybin T.?F.?Boiko R.?V.?Kunakova A.?G.?Ibragimov
Catalytic aminomethylation of pyrrole and indole with N,N,N′,N′-tetramethylmethanediamine in the presence of 5 mol % of ZrOCl2·8H2O proceeds selectively at the positions 2, 5 of pyrrole and 1, 3 of indole. Carbazole under the same conditions affords 3-formyl-9-aminomethyl derivative. The reaction in the presence of 5 mol % of K2CO3 occurs as monoaminomethylation: for pyrrole at the position 2, for indole at the position 3, and for carbazole at the nitrogen atom of the substrate. Water-soluble 1,1′-(1H-pyrrole-2,5-diyl)bis(N,N-dimethylmethanamine) exhibits a fungistatic activity with respect to phytopathogenic fungi Rhizoctonia solani. 相似文献
7.
O. A. Luk’yanov G. A. Smirnov P. B. Gordeev 《Russian Journal of Organic Chemistry》2007,43(8):1228-1231
A preparation method was developed for previously unknown tetrazole derivatives containing in the 1, 2, and/or 5 positions of the tetrazole ring N-methyldiazene-N-oxide-N′-oxymethyl groups. 相似文献
8.
A. O. Kharaneko 《Russian Journal of Organic Chemistry》2016,52(6):892-896
The first representative of a new heterocyclic system, 2,3,4-triphenyl-6,8-dihydropyrrolo[3,2-d]-[1,2]diazepin-7(1H)-one, has been synthesized following an approach based on the reaction of ethyl (3-benzoyl-4,5-diphenyl-1H-pyrrol-2-yl)acetate with hydrazine hydrate. 相似文献
9.
M. M. El’chaninov A. A. Aleksandrov I. M. El’chaninov 《Russian Journal of Organic Chemistry》2015,51(12):1762-1765
2-(2-Furyl)-1,7-dimethyl-1H,7H-benzo[1,2-d: 3,4-d′]diimidazole was synthesized by the Weidenhagen reaction followed by N-methylation. Electrophilic substitution reactions of the title compound (nitration, bromination, sulfonation, formylation, and acylation) involved both the furan ring and central benzene fragment. 相似文献
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N. A. Ivanova A. G. Mustafin F. G. Usmanova S. P. Ivanov M. S. Miftakhov 《Russian Journal of Organic Chemistry》2009,45(2):256-258
By reaction of 2,3-dichloro-, 2,3,5-trichloro-, 2,5-dichloro-3-phenylsulfonyl-, 2-chloro-3-phenylsulfonyl-4,4-ethylenedioxycyclopent-2-en-1-ones with uracyl 3- and 2-uracyl derivatives were obtained of the corresponding chlorocyclopentenone. 相似文献
12.
A. P. Kozachenko O. V. Shablykin A. N. Vasilenko A. N. Chernega V. S. Brovarets 《Chemistry of Heterocyclic Compounds》2011,47(4):507-513
The purpose-directed synthesis of a new heterocyclic system, 7,8-dihydroimidazo[1,2-c][1,3]thia- zolo[4,5-e]pyrimidine has been carried out based on the successive interaction of available 2-(aroyl- aminocyanomethylene)imidazolidines
with hydrogen sulfide and triethyl orthoformate with subsequent intramolecular cyclocondensation of the obtained 8-aroylamino-7-thioxo-1,2,3,7-tetrahydroimidazo-
[1,2-c]pyrimidines under the action of phosphorus pentasulfide or polyphosphoric acid. 相似文献
13.
N. V. Kovganko S. N. Sokolov Yu. G. Chernov Zh. N. Kashkan V. L. Survilo 《Chemistry of Natural Compounds》2010,46(5):750-755
New derivatives of steroidal 6-ketoximes containing α-chloropyridine neonicotinoid groups characteristic of bioactive compounds were synthesized by formation of oximes of cholestane
and stigmastane 3β,5-dihydroxy-6-ketosteroids with O-(2-chloropyridin-5-ylmethyl)hydroxylamine in the presence of zinc or tin(IV) chloride. 相似文献
14.
20S-Protopanaxadiol (3β,12β,20S-trihydroxydammar-24-ene) 3-, 12-, and 20-O-β-D-galactopyranosides were synthesized for the first time. Condensation of 12β-acetoxy-3β,20S-dihydroxydammar-24-ene (1) and 2,3,4,6-tetra-O-acetyl-α-D-galactopyranosylbromide (α-acetobromogalactose) (2) under Koenigs–Knorr conditions with subsequent removal of the protecting groups resulted in regio- and stereoselective formation
of 20S-protopanaxadiol 3-O-β-D-galactopyranoside, an analog of the natural ginsenoside Rh2. Glycosylation of 12β,20S-dihydroxydammar-24-en-3-one (5) by 2 with subsequent treatment of the reaction products with NaBH4 in isopropanol and deacetylation with NaOMe gave 20S-protopanaxadiol 12- and 20-O-β-Dgalactopyranosides. 相似文献
15.
The sodium salt of N-(6-chloronicotinoyl)-γ-aminobutyric acid, a structural analog of the known nootropic and vasidilating drug picamilon, was synthesized via Schotten–Baumann
acylation of γ-aminobutyric acid with 6-chloronicotinoyl chloride and subsequent neutralization of the N-(6-chloronicotinoyl)-γ-aminobutyric acid that was obtained in >60% yield. 相似文献
16.
A. R. Kurbangalieva L. T. Hoang O. A. Lodochnikova M. Yu. Kuzmicheva A. R. Pradipta K. Tanaka G. A. Chmutova 《Russian Chemical Bulletin》2016,65(5):1278-1284
A base-catalyzed reaction of 3,4-dichloro-5-methoxy- and 3,4-dichloro-5-ethoxy-2(5H)-furanones with 2,2´-oxydiethanethiol gave thiols and bis-thioethers of 2(5H)-furanone series. A new S,O-macroheterocyclic compound containing a 18-membered oxathiamacrocycle and two 2(5H)-furanone fragments was synthesized based on the thiols in an aqueous solution of potassium hydroxide, which was characterized by X-ray diffraction. 相似文献
17.
The Diels–Alder reactions of three β-chloro-α,β-unsaturated carbonyl compounds 1–3 with different dienes were carried out to afford highly functionalized cyclohexenes 4–9, bearing quaternary centers, in good yields. These cycloadducts (CAs) undergo dehydrochlorination with subsequent aromatization in the presence of 1,8-diazabicyclo[5.4.0]undec-7-ene DBU to produce new substituted benzenes 11–14. Compound 10 is the product of lactonization and removal of an HCl molecule from compound 7. All products were characterized by NMR, IR, elementary analysis and some of them by MS. Structure assignments of isomers were carried out on the basis of NMR chemical shifts and coupling constants using 1D, 2D and heteronOe NMR techniques. 相似文献
18.
β-Methoxycarbonyl-γ-butyrolactones bearing a γ-aromatic substituent were prepared via copper-catalyzed reductive aldol addition/lactonization domino reactions of ketones with α,β-unsaturated dicarboxylate esters and a silane under ambient temperature. The reaction has advantage of using readily available reagents, mild conditions and high efficiency. 相似文献
19.
Using the eutectic-type T–x–y diagram as an example, it can be represented the analysis of its geometrical construction dependence on the temperature of
a component two polymorphous modifications which participate in mono- and invariant metatectic and invariant eutectic (eutectoid)
transformations above or below (and within) binary eutectics temperature intervals and below a ternary eutectic temperature.
Computer models for considered phase diagrams have been designed. Such models help to solve applied tasks like visualization,
isopleths and isothermal sections decoding, mass balances calculation and evaluation of phase and conglomerate concentration
in microstructure. 相似文献
20.
V. L. Gein A. N. Yankin N. V. Nosova M. V. Dmitriev 《Russian Journal of Organic Chemistry》2016,52(3):379-382
Baeyer–Villiger oxidation of N1,N3,2-triaryl-6-hydroxy-6-methyl-4-oxocyclohexane-1,3-dicarboxamides with 30% hydrogen peroxide in acetic acid afforded 2-(4-aryl-3-carbamoyl-2-methyl-5-oxooxolan-2-yl)acetic acids. 相似文献