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1,3,7,9,11,12,14-Heptazapentacene-2,4,8,10 (14,3,9,12)-tetraones (mixed flavins) were prepared by the cyclization of 1,5-dihydro-8-[N-alkyl-N-(5-nitrouracil-6-yl)-amino-5-deazaflavins with Vilsmeier reagent. The mixed flavins oxidized alcohol under neutral condition in sunlight and a remarkable autorecycling was observed. 相似文献
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Fumio Yoneda Masakazu Koga Kiyoshi Tanaka Yumihiko Yano 《Journal of heterocyclic chemistry》1989,26(5):1221-1228
Cyclization of N, N′-dialkyl-N-(3-methyluracil-6-yl)-N′-(5-nitro-3-methyluracil-6-yl)- p-phenylenediamines with the Vilsmeier reagent gives the corresponding 1,3,6,8,10,11,14-heptaazapentaphene-2,4,7,9-(14H,3H,8H,-11H) -tetrones (angular mixed flavins) 2. Cyclization of N, N′-di(5-nitro-3-methyluracil-6-yl)-p-phenylenedi-amines with the Vilsmeier reagent gives the corresponding 1,3,5,6,8,10,11,14-octaazapentaphene-2,4,7,9-(14H,3H,8H,11H)-tetrones (angular doubled flavins) 11 along with the angular mixed flavins 2. 相似文献
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1,3,8,10,12-Pentazanaphthacene-2,4,7,9(12H,3H,8H,10H)-tetraones (linear pyrimidine-fused 5-deazaflavins) and 1,3,6,8,12-pentazabenz[a]anthracene-2,4,7,9(12H,3H,6H,8H)-tetraones (bent pyrimidine-fused 5-deazaflavins) were synthesized by condensation of 7-alkylaminoquinazoline with 6-chloro-5-formyl-3-methyluracil. Also, their flavin analogs, 1,3,5,8,10,12-hexazanaphthacene-2,4,7,9(12H,3H,8H,10H)-tetraones (linear pyrimidine-fused flavins) and l,3,5,6,8,12-hexazabenz[a]anthracene-2,4,7,9(12H,3H,6H,8H)-tetraones (bent pyrimidine-fused flavins) were synthesized by cyclization of 7-[N-alkyl-N-(5-nitrouracil-6-yl)]aminoquin-azolines with the Vilsmeier reagent. 相似文献
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Convenient preparation of novel 9,11-dimethylbenzocyclohepta[6,7-b]pyrimido[5,4-d]furan-10(9H),12(11H)-dionylium tetrafluoroborate 11*BF4- consisted of a condensation reaction of benzo[d]tropone with dimethylbarbituric acid and following oxidative cyclization reaction by using DDQ-Sc(OTf)3 or photoirradiation under aerobic conditions. Alternative synthesis of 11*BF4- was also accomplished by a condensation reaction of 2-methoxybenzo[d]tropone with dimethylbarbituric acid and a subsequent cyclization reaction by using 42% aq HBF4. The X-ray crystal analysis and MO calculation were carried out to clarify the structural characteristics. Properties of the cation 11 were studied by the pKR+ value (4.7) and reduction potentials (-0.46 and -1.07 V vs Ag/AgNO3) as well as the reaction with some nucleophiles. The oxidizing ability of 11*BF4- toward alcohols in the autorecycling process was demonstrated as well. 相似文献
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合成了螺[异苯并呋喃-1(3H),9'-(9H)-2'-N,N-二苄胺基-6'-二乙胺基占吨]-酮-3,C_(37)H_(34)N_2O_3,单斜晶系,空间群Cc,晶体学参数为a=16.826(4),b=10.648(4),c=17.618(7),β=92.25(2)°,V=3154(2),Z=4,M_r=566.7,D_x=1.19g/cm3,F(000)=1200。结构由直接法解出,偏离因子R=0.080。分子由占吨和异苯并呋喃两部分组成Y形结构,占吨部分相连的苄基的两个苯环位于占吨部分的两侧。 相似文献
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Improved procedures for syntheses of kilogram quantities of quinazolinedione 5 and its intermediates 2,3 and 4 are described. The mechanism of formation of 5 is discussed as well as a side reaction resulting in 7 . 相似文献
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合成了配合物Cu(C14H9NO3)(C3H4N2)[C14H9NO32- 为N-(2-羧基苯基)-水杨醛亚胺,C3H4N2为咪唑].晶体属正交晶系,空间群Pca21,晶胞参数a=0.94453(12)nm,b=1.12278(9)nm,c=2.9123(4)nm,V=3.0885(6)nm3,Mr=370.84,Z=8,最终的偏离因子R=0.036,wR=0.087,GOF=0.975.三齿Schiff碱配体中的二个氧原子、一个氮原子和咪唑的一个氮原子与铜原子配位,形成扭曲的平面正方形结构.通过元素分析,IR,UV,CV和TG表征了配合物的结构. 相似文献
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S. A. Meshcheryakova 《Russian Journal of General Chemistry》2014,84(8):1539-1542
A new approach to prepare 2-chloroacetamides has been developed, based on the reaction of chloroacetyl chloride with excess of secondary amines. Alkylation of 6-methyl-1-(thiethan-3-yl)pyrimidine-2,4(1H,3H)-dione with the synthesized 2-chloroacetamides in the presence of potassium carbonate has afforded N 3-acetamido-substituted 6-methyl-1-(thiethan-3-yl)pyrimidine-2,4(1H,3H)-diones. 相似文献
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Synthesis of novel 4,9-methanoundecafulvene [5-(4,9-methanocycloundeca-2',4',6',8',10'-pentaenylidene)pyrimidine-2(1H),4(3H),6(5H)-trione] derivatives 10a-c was accomplished. Their structural characteristics were investigated on the basis of the 1H and 13C NMR and UV-vis spectra. Upon treatment with DDQ, 10a-c underwent oxidative cyclization to give novel 11,13-disubstituted 3,8-methanocycloundeca[8,9-b]pyrimido[5,4-d]furan-12(11H),14(13H)-dionylium tetrafluoroborates 11a-c*BF4- in good yields. The spectroscopic properties of 11a-c*BF4- were studied, and the structural characterization of 11b*BF4- was performed by the X-ray crystal analysis. Cations 11a-c were very stable, and their pKR+ values were determined spectrophotometrically to be 8.3-8.9. The electrochemical reduction of 11a-c exhibited low reduction potentials at -0.43 to -0.45 (V vs Ag/AgNO3) upon cyclic voltammetry (CV). In a search for reactivity, reactions of 11a*BF4- with some nucleophiles, hydride and diethylamine, were carried out to clarify that the methano-bridge controls the nucleophilic attacks to occur with endo-selectivity. The photoinduced oxidation reactions of 11a*BF4- toward some amines under aerobic conditions were carried out to give the corresponding carbonyl compounds in more than 100% yield. 相似文献
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The compounds (NC(12)H(8)(NH)(2))[Ln(N(3)C(12)H(8))(4)], Ln = Y, Tb, Yb, and [Ln(N(3)C(12)H(8))(2)(N(3)C(12)H(9))(2)][Ln(N(3)C(12)H(8))(4)](N(3)C(12)H(9))(2), with Ln = La, Sm, Eu, were obtained by reactions of the group 3 metals yttrium and lanthanum as well as the lanthanides europium, samarium, terbium, and ytterbium with 2-(2-pyridyl)-benzimidazole. The reactions were carried out in melts of the amine without any solvent and led to two new groups of homoleptic rare earth pyridylbenzimidazolates. The trivalent rare earth atoms have an eightfold nitrogen coordination of four chelating pyridylbenzimidazolates giving an ionic structure with either pyridylbenzimidazolium or [Ln(N(3)C(12)H(8))(2)(N(3)C(12)H(9))(2)](+) counterions. With Y, Eu, Sm, and Yb, single crystals were obtained whereas the La- and Tb-containing compounds were identified by powder methods. The products were investigated by X-ray single crystal or powder diffraction and MIR and far-IR spectroscopy, and with DTA/TG regarding their thermal behavior. They are another good proof of the value of solid-state reaction methods for the formation of homoleptic pnicogenides of the lanthanides. Despite their difference in the chemical formula, both types (NC(12)H(8)(NH)(2))[Ln(N(3)C(12)H(8))(4)], Ln = Y (1), Tb (2), Yb (3), and [Ln(N(3)C(12)H(8))(2)(N(3)C(12)H(9))(2)][Ln(N(3)C(12)H(8))(4)](N(3)C(12)H(9))(2), Ln = La (4), Sm (5), Eu (6), crystallize isotypic in the tetragonal space group I4(1). Crystal data for (1): T = 170(2) K, a = 1684.9(1) pm, c = 3735.0(3) pm, V = 10603.5(14) x 10(6) pm(3), R1 for F(o) > 4sigma(F(o)) = 0.053, wR2 = 0.113. Crystal data for (3): T = 170(2) K, a = 1683.03(7) pm, c = 3724.3(2) pm, V = 10549.4(14) x 10(6) pm(3), R1 for F(o) > 4sigma(F(o)) = 0.047, wR2 = 0.129. Crystal data for (5): T = 103(2) K, a = 1690.1(2) pm, c = 3759.5(4) pm, V = 10739(2) x 10(6) pm(3), R1 for F(o) > 4sigma(F(o)) = 0.050, wR2 = 0.117. Crystal data for (6): T = 170(2) K, a = 1685.89(9) pm, c = 3760.0(3) pm, V = 10686.9(11) x 10(6) pm(3), R1 for F(o) > 4sigma(F(o)) = 0.060, wR2 = 0.144. 相似文献
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The cross-coupling reaction of 9-I-3-(π-C5H5)-3,1,2-CoC2B9H10 with organozinc compounds catalyzed by palladium complexes was used to synthesize the first representative ofB-phenyl-substituted carboranes, 9-C6H5-3-(π-C5H5)-3,1,2-CoC2B9H10.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No: 6, pp. 1253–1254, June, 1998. 相似文献