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1.
Christian Deshayes Michel Chabannet Suzanne Gelin 《Journal of heterocyclic chemistry》1984,21(2):301-304
1H(or 2H)4H10H[1]Benzoxepino[3,4-c]pyrazol-4-ones were prepared from phenoxymethylpyrazolecarboxylic acids which in turn were synthesized from simple starting materials. Different pathways to allow the predominant formation of the N-1 or N-2 substituted derivatives are described. The isomeric 1 or 2-substituted structures were supported by 13C-nmr. 相似文献
2.
Jerry L. Atwood Anthony W. Coleman Hongming Zhang Simon G. Bott 《Journal of inclusion phenomena and macrocyclic chemistry》1989,7(2):203-211
The title calixarenes all exist in the solid state as bilayers of anionic calixarenes in the cone configuration. These layers alternate with inorganic regions which contain the cations and the water molecules. The overall structures bear a close resemblance to those found for clay minerals. The sodium salt crystallizes in the triclinic space groupP witha = 10.998(6),b = 13.582(5),c = 14.472(5) Å, = 74.01(3), = 89.09(4), = 86.50(4)°, andZ = 2 forD
calc
= 1.72 g cm–3. Refinement based on 4727 observed reflections led to a conventionalR = 0.050. The potassium salt crystallizes in the triclinic space groupP witha = 11.815(9),b = 13.636(6),c = 14.040(9) Å, = 100.24(5), = 111.86(9), = 95,14(9)°, andZ = 2 forD
calc
= 1.77 g cm–3. Refinement based on 2977 observed reflections led toR = 0.15. The rubidium and cesium salts are isostructural and crystallize in the monoclinic space groupP21/n with parameters for Rb[Cs]a = 11.603(5) [11.704(3)],b = 28.607(8) [29.747(9)],c = 12.512(5) [12.604(4)] Å, = 91.70(4) [91.63(2)°], andZ = 4 forD
calc
= 2.01 [2.24] g cm–3. Refinement based on 1750 [4257] observed reflections led toR = 0.108 [0.075]. Disorder of the cations was observed for the rubidium and cesium salts.
Supplementary Data relating to this article are deposited with the British Library as Supplementary Publication No. SUP 82074 (95 pages). 相似文献
3.
A. Monge J. A. Palop T. Goñi A. Martinez E. Fernández-Alvarez 《Journal of heterocyclic chemistry》1984,21(2):381-384
The synthesis of two new derivatives of 3H[1,2]diazepino[5,6-b]indole, 5 and 11 , and one new derivative of 3H[1,2]diazepino[4,5-b]indole, 16 , are described. Compound 5 was obtained by the reaction of methyl 2-(3-methoxycarbonyl-1-methylindole)acetate 2 , with hydrazine. Compound 11 was obtained in two ways from ethyl 2-(1-methylindole)acetate ( 8 ) by formylation and reaction with hydrazine. Compound 16 was obtained treating 3-(2-ethoxycarbonylindole)acetonitrile ( 14 ) with hydrazine. 相似文献
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5.
Misbahul Ain Khan Maria Lucia De Brito Morley 《Journal of heterocyclic chemistry》1978,15(8):1399-1401
The diazotization of 3-aminocoumarin followed by its reduction gave the cournarin-3-yl-hydrazine which, without isolation, reacted with various carbonyl compounds in a Fisher's indohzation reaction to give derivatives (Ib-Ih) of the yet unreported system 3H,4H[1]benzopyrano[3,4-b]pyrrol-4-one. 相似文献
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7.
Jelínek T Kilner CA Thornton-Pett M Kennedy JD 《Chemical communications (Cambridge, England)》2001,(18):1790-1791
B10H14 and PhCHO yield [6-Ph-nido-6-CB9H11]- (94%), from which the nine-vertex C-phenyl monocarbaborane anion [4-Ph-closo-4-CB8H8]- (68%) can be obtained by heating at 200 degrees C, and from which the twelve- and ten-vertex analogues [1-Ph-closo-1-CB11H11]- (50%) and [4-Ph-closo-4-CB9H9]- (25%) can be obtained by heating at 210 degrees C with BH3(NEt3). 相似文献
8.
In this work, two new effective methodologies have been adopted for the preparation of 5-(2′-bromobenzyloxy)pyrimidine-2,4-diones 6(a–k). In the first methodology, 5-hydroxy uracils 4(a–f) were alkylated with 2-bromobenzyl bromide 5a or 2-bromo-5-methoxy benzyl bromide 5b under phase transfer catalysis condition using lithium hydroxide/tetrabutyl ammonium bromide in N,N-dimethylformamide at 45 °C, and in the second method, the microwave irradiation (MWI) protocol has been exploited by mixing 5-hydroxy uracils 4(a–f) with 30 % excess of 2-bromobenzyl bromide 5a or 2-bromo-5-methoxy benzyl bromide 5b. A catalytic amount of TBAB and potassium carbonate was added and irradiated in an open Erlenmeyer flask in a microwave oven for 3–12 min. The tributyltin hydride-mediated radical cyclisation of 6(a–k) was carried out under MWI to generate 1H,3H,6H[2]benzopyrano[4,3-d]pyrimidine-2,4-diones 7(a–k) in 80–89 % yield, and the reaction time was shortened compared to the previously reported conventional radical cyclisation method. 相似文献
9.
1H,3H-Imidazo[1,5-c]thiazole-5,7-[6H,7aH]-dione and the corresponding 7-thione derivatives as well as 7,8-dihydro-5H-imidazo[1,5-c][1,3]thiazine-1,3-[2H,8aH]-dione and the corresponding 3-thione derivatives were synthesized starting from L -cysteine and DL -homocysteine thiolactone, respectively. The second group of bicyclic compounds represents a new heterocyclic ring system. The structures of the compounds were confirmed by spectroscopic studies and elemental analyses. 相似文献
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12.
Dezhu Wu Zheng Zhang Baoling Chen Ginfu Li 《Journal of Radioanalytical and Nuclear Chemistry》2003,258(3):689-691
The synthesis of [3H]-higenamine by a four steps reaction, namely condensation, cyclization, catalytic tritiation and demethoxylation is described. The acidulated product was purified by thin layer chromatography and the final component has a high specific activity and radiochemical purity. 相似文献
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Russian Journal of Organic Chemistry - 相似文献
16.
H. Vogler 《Magnetic resonance in chemistry : MRC》1979,12(5):306-312
The ring current and local anisotropic contributions to the 1H chemical shifts of [n]annuleno[m]annulenes and [n]annulenyl[m]annulenes with n, m = 12, 14, 18 and n, m = 13, 15 are calculated. The agreement between experimental and calculated shifts for the few known compounds is very good so that the predictions for the as yet unknown compounds are reliable. The effect of an annulene ring on the shifts of the protons at the other ring in these bicyclic compounds is discussed for several types of fusion of the two constituent annulenes. 相似文献
17.
Francesco Guerrera Maria Angela Siracusa Natale Alfredo Santagati Benedetto Tornetta 《Journal of heterocyclic chemistry》1986,23(3):951-953
Alternate routes for the synthesis of the new title compounds are described. The experimental procedure for the isolation of the unstable 2,3-diaminobenzo[b]thiophene as the dichloride salt is presented. 相似文献
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M. Bakavoli A. Davoodnia M. Rahimizadeh M. M. Heravi 《Phosphorus, sulfur, and silicon and the related elements》2013,188(10):2303-2308
Several [1,2,4]triazolobenzothiadiazocin-11-ones 3 were prepared via ring expansion of [1,2,4]triazolo[3,2-b][2,4]benzothiazepin-10(5H)-ones 1 in presence of sodium azide. The reaction intermediate was isolated and characterized as an aryl isocyanate 2b . A possible pathway for formation of novel triazolobenzothiadiazocin-11-one 3 is described. 相似文献
20.
Jean-Louis Ripoll Yannick Valle Mohamed Khalid Abdelhak Hakiki 《Journal of heterocyclic chemistry》1992,29(7):1867-1868
4,5-Dihydro-1H,3H-thieno[3,4-c]thiophene and 4,5-dihydro-1H,3H-thieno[3,4-c]furan were synthesized by retro Diels-Alder reactions under flash vacuum thermolysis conditions. 相似文献