共查询到20条相似文献,搜索用时 15 毫秒
1.
I. V. Nagorichna M. M. Garazd Ya. L. Garazd V. P. Khilya 《Chemistry of Natural Compounds》2007,43(1):15-18
N-Substituted angular pyranodihydrobenzoxazines were prepared by condensation of 3-hydroxy-dibenzo[b,d]pyran-6-one with various primary amines and two equivalents of formaldehyde in the presence of 4-N,N-dimethylaminopyridine
as base.
__________
Translated from Khimiya Prirodnykh Soedinenii, No. 1, pp. 14–17, January–February, 2007. 相似文献
2.
3.
Benzo[c]furo[3,2-g]chromen-5-ones, modified psoralen analogs containing a substituted benzene ring annelated at the 5,6-position of the furo[3,2-g]chromen-7-one system, were prepared by the MacLeod method.Translated from Khimiya Prirodnykh Soedinenii, No. 6, pp. 441–445, November–December, 2004.This revised version was published online in April 2005 with a corrected cover date. 相似文献
4.
O. B. Ryabova V. A. Makarov L. M. Alekseeva A. S. Shashkov V. V. Chernyshev V. G. Granik 《Russian Chemical Bulletin》2005,54(8):1907-1914
ortho-Chloroaryl(hetaryl)carboxamides containing one or two nitro groups at positions 3 and/or 5 of the ring undergo condensation
accompanied by the pyrimidine ring closure on refluxing in an excess of sodium methoxide to form bicyclic products, viz., quinazolin-4-one, pyrido[2,3-d]pyrimidin-4-one, and pyrido[4,3-d]pyrimidin-4-one derivatives. The scheme of cyclization processes was proposed. The structures of the reaction products were
confirmed by a number of physicochemical data, including X-ray diffraction analysis.
__________
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 8, pp. 1851–1858, August, 2005. 相似文献
5.
E. B. Tsupak M. A. Shevchenko V. V. Kostrub Yu. N. Tkachenko 《Russian Chemical Bulletin》2007,56(11):2330-2336
5-Aroyl-1,3,6-trimethyluracils were converted to pyrano[4,3-d]pyrimidinium salts. Reactions of the salts obtained with ammonia, primary amines, and hydrazine were studied.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 11, pp. 2251–2257, November, 2007. 相似文献
6.
Heating of 5-acetyl-4-aminopyrimidine derivatives with ethyl acetoacetate, ethyl benzoylacetate, and diethyl acetone-1, 3-dicarboxylate in the absence of a base gave the corresponding 6-acylpyrido[2, 3-d]pyrimidin-7(8H)-ones. Under analogous conditions, the reaction with ethyl malonate afforded ethyl 7-oxo-7, 8-dihydropyrido[2, 3-d]pyrimidine-6-carboxylates. The pyridone (rather than hydroxypyridine) structures of the pyridopyrimidines obtained were confirmed by IR spectroscopy.__________Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 3, pp. 770–773, March, 2005. 相似文献
7.
Ahmad Shaabani Ebrahim Soleimani Maria Darvishi 《Monatshefte für Chemie / Chemical Monthly》2007,138(1):43-46
Summary. The three-component condensation of aldehyde, N,N′-dimethylbarbituric acid and alkyl or aryl isocyanide afforded the corresponding furo[2,3-d]pyrimidine-2,4(1H,3H)-diones in 1-butyl-3-methylimidazolium bromide as an ionic liquid in high yields at room temperature within several minutes. 相似文献
8.
9.
O. B. Ryabova M. I. Evstratova V. A. Makarov V. A. Tafeenko V. G. Granik 《Chemistry of Heterocyclic Compounds》2004,40(10):1352-1358
The reaction of 5-formyl-4-thiocyanatopyrimidines with nitromethane was studied under various conditions. The reaction was found unexpectedly to proceed with closure of a thiophene ring to give thieno[2,3-d]pyrimidines. The use of ammonium acetate as the catalyst leads to a side reaction involving closure of an isothiazole ring to give isothiazolo[5,4-d]pyrimidines. X-ray diffraction crystallographic analysis was used to confirm the structure of thieno[2,3-d]pyrimidine.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1564–1571, October, 2004. 相似文献
10.
Kh. S. Shikhaliev D. V. Kryl’skii A. Yu. Potapov M. Yu. Krysin 《Russian Chemical Bulletin》2005,54(12):2903-2904
Three-component condensation of 3-amino-1,2,4-triazole (or its 5-methyl and 5-methylthio derivatives), dimedone (or cyclohexane-1,3-dione),
and dimethylformamide dimethyl acetal afforded 8,8-R, R-8,9-dihydro[1,2,4]triazolo[1,5-a]quinazolin-6(7H)-ones.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 12, pp. 2805–2807, December, 2005. 相似文献
11.
V. F. Mironov L. M. Burnaeva I. A. Litvinov Yu. Yu. Kotorova A. B Dobrynin R. Z. Musin I. V. Konovalova 《Russian Chemical Bulletin》2004,53(8):1704-1710
The reaction of the di-O-trimethylsilyl derivative of 2-hydroxynicotinic acid with methyl phosphodichloridite afforded 2-methoxy-1,3,2-dioxaphosphorino[4,5-b]pyridin-4(4H )-one. The NMR spectrkscopic data suggest that the reaction of the latter with hexafluoroacetone produces unstable 2-methoxy-2,5-dioxo-4,4-bis(trifluoromethyl)-4,5-dihydro-1,3,2-dioxaphosphepino[4,5-b]pyridine, which is readily transformed into 9-methyl-2,5-dioxo-4,4- bis(trifluoromethyl)-4,5-dihydro-1,3,2-dioxaphosphepino[4,5-b]pyrid-9-inium-2-oate. The structure of the hydrolysis product of the latter, viz., 1-methyl-3-(2-hydroxy-3,3,3-trifluoro-2- trifluoromethylpropanoyl)pyridin-2-one, was established by X-ray diffraction analysis.Published in Russian in Izvestiya Akademii Nauk.
Seriya Khimicheskaya, No. 8, pp. 1640–1646, August, 2004. 相似文献
12.
The interaction of 6-allylthio-4-imino-1-methyl-3-methylthio-5-phenyl-1,5-dihydro-4H-pyrazolo[3,4-d]-pyrimidine with bromine
leads to the formation of 8-bromomethyl-4-imino-1-methyl-3-methylthio-5-phenyl-4,5,7,8-tetrahydro-1H-pyrazolo[4,3-e][1,3]thiazolo[3,2-a]
pyrimidinium tribromide.
__________
Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 4, pp. 602–604. April, 2007. 相似文献
13.
14.
Nickel acetate promoted reaction of diethyl acetone-1,3-dicarboxylate with N-cyanobenzamidine led to ethyl 4-amino-6-ethoxycarbonylmethyl-2-phenylpyrimidine-5-carboxylate, upon treatment of which with
RNH2, the corresponding 6-(carbamoylmethyl)pyrimidines were obtained. Cyclization of the latter upon treatment with MeONa afforded
6-R-4-amino-7-hydroxy-2-phenylpyrido[4,3-d]pyrimidin-5(6H)-ones.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 11, pp. 2212–2214, November, 2007. 相似文献
15.
9-Hydroxy-3-methoxy-6H-pyrido[1,2-a]pyrazin-6-one, a new pyrido[1,2-a]pyrazine alkaloid named xylogranatinin, was isolated from the fruit of a Chinese mangrove Xylocarpus granatum. Its structure was elucidated on the basis of spectroscopic data, especially 2D NMR techniques including HSQC and HMBC. To
the best of our knowledge, this is the first time that a pyrido[1,2-a]pyrazine alkaloid was found as a natural product.
Published in Khimiya Prirodnykh Soedinenii, No. 4, pp. 351–352, July–August, 2007. 相似文献
16.
V. V. Kostrub E. B. Tsupak Yu. N. Tkachenko M. A. Shevchenko 《Russian Chemical Bulletin》2008,57(8):1754-1759
Reactions of 5-aryl- and 5,7-diaryl-1,3-dimethyl-2,4-dioxopyrano[4,3-d]pyrimidinium salts with hydrazine were studied. In the former case, the reaction products were the 6-amino-1,3-dimethyl-2,4-dioxopyrido[4,3-d]pyrimidinium salts. 5,7-Diarylpyrano[4,3-d]pyrimidinium salts were transformed into either the corresponding pyridinium salts or 1H-pyrimido-[5,4-d][1,2]diazepine-2,4(3H,9H)-diones, depending on the hydrazine concentration and the reaction time.
For Part 1, see Ref. 1.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 8, pp. 1720–1725, May, 2008. 相似文献
17.
Syntheses of 5,6-Diamino-1,3-Dihydrobenzo[<Emphasis Type="Italic">c</Emphasis>]thiophene 2,2-Dioxide
5,6-Diamino-1,3-dihydrobenzo[c]thiophene 2,2-dioxide was obtained by two methods from 5-amino-6-nitro- and 5-acylamino-1,3-dihydrobenzo[c]thiophene 2,2-dioxide.__________Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 4, pp. 522–523, April, 2005. 相似文献
18.
L. Yu. Ukhin L. G. Kuzrmina T. N. Gribanova L. V. Belousova Zh. I. Orlova 《Russian Chemical Bulletin》2008,57(1):186-192
12H-Benzo[5,6][1,2,4]triazepino[3,4-a]isoindol-5(6H)-one was synthesized by the condensation of anthranilic acid hydrazide with o-phthalaldehyde. The structure of this compound was established by the X-ray diffraction study of its isopropyl derivative.
The mechanism of formation of this compound was suggested and its alkylation reactions were investigated.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 1, pp. 180–185, January, 2008. 相似文献
19.
T. E. Khoshtariya M. M. Matnadze N. T. Mirziashvili L. N. Kurkovskaya M. I. Sikharulidze T. O. Dzhashi 《Chemistry of Heterocyclic Compounds》2004,40(11):1454-1459
The Sandmeyer reaction was used to prepare 2,3-dioxo-2,3-dihydrobenzo[b]furoindoles which could be reduced with diborane or with complex hydrides to give the corresponding unsubstituted as well as the 3-hydroxybenzo[b]furoindoles.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No 11, pp. 1683–1689, November, 2004. 相似文献
20.