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Keitaro Senga Misuzu Ichiba Hashime Kanazawa Sadao Nishigaki 《Journal of heterocyclic chemistry》1982,19(1):77-80
Synthesis and properties of hitherto unknown thiazolo[5,4-d]pyrimidine 1-oxides are described. For example, the reaction of 6-chloro-1,3-dimethyl-5-nitrouracil (I) with methyl thioglycolate in the presence of excess triethylamine afforded 2-methoxycarbonyl-4,6-dimethylthiazolo[5,4-d]pyrimidine-5,7-(4H,6H)dione 1-oxide (IIIa), which is a versatile intermediate for the preparation of various thiazolo[5,4-d]pyrimidine derivatives. 相似文献
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Wenkai Zhong Chao Xu Biao Xiao Li Fan Hongbin Wu Bin Zhang Wei Yang 《Polymer Science Series B》2016,58(5):587-593
Two broad band-gap high molecular weight polymers, poly[(5,11-di(9’-heptadecanyl)-indolo[3,2-b]carbazole-alt-2,5-bis(3-n-octylthiophene-2-yl)-thiazolo[5,4-d]thiazole (PICzOTzTz) and poly[(5,11-di(9’-heptadecanyl)-indolo[3,2-b]carbazole-alt-2,5-bis(3-n-n-dodecylthiophene-2-yl)-thiazolo[5,4-d]thiazole]) (PICzDOTzTz), consisting of indolo[3,2-b]carbazole (ICz) and thiazolo[5,4-d]thiazole (TzTz) derivatives were synthesized by Suzuki polycondensation. Their physical, electrochemical and optical properties were characterized in details. The thermogravimetric analysis displayed high thermal stability, and 5% degradation temperatures of PICzOTzTz and PICzDOTzTz were 427 and 435°C, respectively. The optical band gaps of PICzOTzTz and PICzDOTzTz were 2.13 and 2.07 eV, respectively. The hole mobilities of PICzOTzTz and PICzDOTzTz were investigated by the space charge limited current (SCLC) method, which gave the mobility values of 7.21 × 10–5 and 1.57 × 10–4 cm2/(V s) for each polymer, respectively. Through the photo-voltaic characterization in polymer solar cells, they showed that the power conversion efficiencies of PICzOTzTz and PICzDOTzTz were 0.64 and 0.99%, respectively. 相似文献
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Zhang ZG Min J Zhang S Zhang J Zhang M Li Y 《Chemical communications (Cambridge, England)》2011,47(33):9474-9476
A new copolymer of dithienosilole and dithienylthiazolo[5,4-d]thiazole with a hexyl side chain on the 4-position of thiophene units was designed and synthesized. Polymer solar cells based on the polymer as a donor and PC(70)BM as an acceptor demonstrated a power conversion efficiency up to 5.88% with a high fill factor of 71.6%. 相似文献
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I. V. Zavarzin N. G. Smirnova V. N. Yarovenko M. M. Krayushkin 《Russian Journal of Organic Chemistry》2006,42(2):273-274
A convenient procedure was developed for preparation of thiazolo[5,4-b]pyridine-2-carboxamides by oxidation of monothiooxamides synthesized from 3-aminopyridine. 相似文献
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E. V. Tarasov Yu. Yu. Morzherin N. N. Volkova V. A. Bakulev 《Chemistry of Heterocyclic Compounds》1996,32(8):971-974
We have obtained a series of 1,2,3-thiadiazolo[5,4-d]pyrimidines by condensation of 5-(R-amino)-substituted-1, 2, 3-thiadiazoie-4-N-R-(thio)carboxamides with ortho esters.Department of the Technology of Organic Synthesis, Urals State Technical University, S. M. Kirov Urals Polytechnical Institute, Ekaterinburg. Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 8, pp. 1124–1127, August, 1996. Original article submitted May 24, 1996. 相似文献
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The preparation of liquid-crystalline 2,5-bis(4-alkyloxyphenyl) thiazolo [5,4-d] dithiazoles (ATTn), in which the alkyl group is CnH2n + 1 (where n = 1 to 10, 12), has been described. Mesomorphic properties and phase transitions as determined by polarizing hot stage microscopy and differential scanning calorimetry are discussed as a function of the number of carbon atoms in the alkyloxy chain. The exhibition of tilted smectic phases (smectic C and smectic I) by these compounds is an interesting feature since there is no significant central dipole moment transverse to these molecules. 相似文献
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Ji-Wang Chern Dean S. Wise Leroy B. Townsend 《Journal of heterocyclic chemistry》1984,21(4):1245-1246
A facile synthesis of methyl oxazolo[5,4-d]pyrimidine-2-carbamic acids by the cyclodesulfurization of a methoxycarbonyl thiourea with dicyclohexylcarbodiimide is described. 相似文献
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Sevil Söyleyici Gülbanu Koyundereli Çılgı 《Journal of Thermal Analysis and Calorimetry》2014,118(2):705-709
Thermal behavior and UV–Vis absorption properties of 2,5-bis(2-hydroxyphenyl)thiazolo[5,4-d]thiazole were investigated in the present study. It was found that decomposition occurs in two stages which correspond to removal of both phenolic rings and degradation of remaining core structure, respectively. After the characterization of decomposition stages, apparent activation energy values of each stage were calculated using model-free isoconversional methods (FWO and KAS). Apparent activation energies of decomposition stages are determined by both methods. Their averages are calculated as 98.232 and 123.253 kJ mol?1 in consecutive order. UV–Vis absorption properties of this compound have been determined with using different solvents. 相似文献
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A method for the preparation of 2,4,8-trioxo-6-methyl derivatives of pyrimido[5,4-d]pyrimidine with various alkyl residues in the 7 position is described. It is shown that the chlorine in the 4 position of the 2,4-dichloro derivative of pyrimido[5,4-d]pyrimidine is the most labile in nucleophilic substitution reactions.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 4, pp. 517–520, April, 1977. 相似文献
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The first metal complexes of 2,5-di(2-pyridyl)thiazolo[5,4-d]thiazole (5) are described. X-Ray crystal structures are reported for the free ligand 5, a dinuclear copper complex 6 and the two diastereoisomers, 7meso and 7rac, of the dinuclear bis(2,2'-bipyridine)ruthenium complex. The two diastereoisomers of 7 and the 4,4'-dimethyl-2,2'-bipyridine analogue 8 are readily separated by cation exchange chromatography. 1H NMR and visible absorption spectra and electrochemical data for the four dinuclear ruthenium complexes reveal that these have relatively small HOMO-LUMO energy gaps and exhibit relatively weak metal-metal interactions. 相似文献
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5-Amino-3-methylisothiazole-4-carbonitrile 2 was prepared by oxidation of 3-amino-2-cyano-thiocrotonamide 1 . A series of 4-amino-3-methylisothiazolo[5,4-d]pyrimidines 6 was derived from 2 by reaction with orthoesters followed by cyclization with primary amines. Hydrolysis of 2 to the corresponding amide 10 followed by cyclization with orthoesters gave the corresponding 5H-isothiazolo[5,4-d]pyrimidin-4-ones 11 . Reactions of 2 and 10 with sodium methyl xanthate gave the corresponding pyrimidinethione derivatives 12 and 13. 相似文献
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The syntheses of the 7-phenylpyrimido[5,4-d][1]benzazepin-2-ones 3, 4 , and 5 are described. The 7-phenyl group was introduced by phenylation of the lactam nitrogen in 10, 13 and 16 respectively. One of these compounds, 5 , showed moderate activity as a CNS agent. 相似文献
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Regioselectively Synthesis of Thiazolo[4,5‐a]acridines and Oxazolo[5,4‐a]thiazolo[5,4‐j]acridines via Multicomponent Domino Reactions
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A regioselective three‐component reaction of aromatic aldehydes, 2‐hydroxy‐1,4‐naphthoquinone and benzo[d]thiazol‐5‐amine in HOAc under microwave irradiation has been developed. A series of new thiazolo‐fused benzo[h]acridines were synthesized with high chemical yields in this one‐pot reaction. The resulting thiazolo‐fused acridines were employed to further react with aldehydes and ammonium acetate to give polycyclic‐fused oxazolo[5,4‐a]thiazolo[5,4‐j]acridines. The present synthesis shows several advantages, such as operational simplicity, fast reaction rates, which makes it a useful and attractive process of library generation for drug discovery. 相似文献
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Polymer solar cells (PSCs) are composed of a blend film of a conjugated polymer donor and a soluble fullerene derivative acceptor sandwiched between a PEDOT?:?PSS coated ITO positive electrode and a low workfunction metal negative electrode. The conjugated polymer donor and the fullerene derivative acceptor are the key photovoltaic materials for high performance PSCs. For the acceptors, although [6,6]-phenyl-C(61)-butyric acid methyl ester (PC(60)BM) and its corresponding C(70) derivative PC(70)BM are dominantly used as the acceptors in PSC at present, several series of new fullerene derivatives with higher-lying LUMO energy level and better solubility were reported in recent years for further improving the power conversion efficiency of the PSCs. In this perspective paper, we reviewed the recent research progress on the new fullerene derivative acceptors, including various PC(60)BM-like C(60) derivatives, PC(60)BM bisadduct, PC(70)BM bisadduct, indene-C(60) bisadduct and indene-C(70) bisadduct, trimetallic nitride endohedral fullerenes and other C(60) derivatives with multi side chains. The synthesis and physicochemical properties of PC(60)BM and PC(70)BM were also introduced considering the importance of the two fullerene acceptors. 相似文献
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In a one-pot synthesis, 1′-methyl-2,3″-dioxo-5″-aryl-1,2,5a″,7″,8″,9a″-hexahydro-5″H,6″H-dispiro[indole-3,2′-pyrrolidine-3′,2″-pyrano[2,3-d][1,3]thiazolo[3,2-a]pyrimidine]-4′-carboxylic acid methyl ester was prepared via the sequential reaction of 4-aryl-octahydro-pyrano[2,3-d]pyrimidine-2-thione, dimethyl acetylenedicarboxylate (DMAD), and a mixture of isatin and sarcosine. All the novel spiro compounds, in moderate yields, were characterized thoroughly by infrared, NMR, mass spectromentry, and elemental analysis together with x-ray crystallographic analysis. 相似文献