New heteroaromatic compounds—IV The nitration and chlorination of 10-methyl-10:9- borazarophenanthrene

10-Methyl- and 10-hydroxy-10:9-borazarophenanthrene have been nitrated with nitric acid in acetic anhydride, and the former compound has been chlorinated with chlorine in acetic acid; the products have been oriented and the proportions of isomers determined quantitatively. The results are shown to be in general agreement with the predictions of MO theory, attack taking place in the 6- and 8-positions. A method for degrading such boron compounds is described, and also the synthesis of 2-, 6-, and 8-chloro-10-methyl-10:9-borazarophenanthrenes as reference compounds. The 6- and 8-amino derivatives of 10-methyl and 10-hydroxy-10:9-borazarophenanthrene have been prepared by reduction of the corresponding nitro derivatives.     

Synthesis and properties of substituted 10-phenyl-10-hydroxy-10H-pyrido[2,3-b]chromenes

It is shown that 2-aryloxy-3-benzoyl-6-methylpyridines undergo cyclization to the corresponding derivatives of 10-phenyl-10-hydroxy-10H-pyrido[2,3-b]chromenes under the influence of concentrated sulfuric acid in glacial acetic acid. The pK_R+ values of the products, which range from –6.28 to –9.27 and correlate with the _p ⁰ and _R ⁰ meta substituent constants, depending on the position of the substituent, were determined by spectrophotometry.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 6, pp. 798–800, June, 1982.     

超高效液相色谱法测定畜禽肉中10种磺胺类药物残留量

提出了超高效液相色谱法测定畜禽肉中10种磺胺类药物残留量的方法。样品经乙酸-乙腈(1+99)混合溶剂提取,旋转蒸发后用乙酸(0.1+99.9)溶液溶解,正己烷净化。以AcquityUPLC BEH C18色谱柱为分离柱,以不同体积比混合的乙腈和乙酸(0.1+99.9)溶液为流动相进行梯度洗脱,用二极管阵列检测器于波长265nm检测。10种磺胺类药物的质量浓度与其峰面积均在0.05～10mg.L-1范围内呈线性关系,检出限(3S/N)为2～6μg.kg-1。方法的回收率在70.8%～93.3%之间,相对标准偏差(n=9)在2.7%～7.7%之间。     

10-(4-联苯基)-2-异丙基噻吨酮硫鎓六氟磷酸的合成与表征

以2-异丙基硫杂蒽酮为原料,乙腈为溶剂经硝酸铈铵氧化得到中间体2-异丙基硫杂蒽酮亚砜,在硫酸存在的条件下,再与联苯反应得到锍盐中间体,最后以醇类和水为混合溶剂,锍盐中间体与六氟磷酸钾进行离子交换得到10- (4-联苯基)-2-异丙基噻吨酮硫鎓六氟磷酸,通过紫外光谱、红外光谱和核磁共振测定,对产物进行了结构确证。     

Structure elucidation of 11-amino-8-hydroxypentacyclo[5.4.0.0(2, 6).0(3, 10).0(5, 9)]undecane-8,11-lactam through selective acetylation and complete 1H and 13C NMR spectral assignment of the mono-, di- and triacetates

NMR techniques cannot unambiguously distinguish between 11-amino-8-hydroxypentacyclo[5.4.0.0(2, 6).0(3, 10).0(5, 9)]undecane-8,11-lactam and 8-amino-11-hydroxypentacyclo[5.4.0.0(2, 6).0(3, 10).0(5, 9)]undecane-8,11-lactam, both of which are possible products during the reaction of pentacyclo[5.4.0.0(2, 6).0(3, 10).0(5, 9)]undecane-8,11-dione with Strecker reagents. Treatment of 11-amino-8-hydroxy-pentacyclo[5.4.0.0(2, 6).0(3, 10).0(5, 9)]undecane-8,11-lactam with acetic anhydride at room temperature produced a monoacetate. With acetic anhydride containing sodium acetate, a triacetate was obtained at reflux temperature. Treatment with acetyl chloride and N,N-dimethylaniline produced a diacetate. High-field 1H and 13C NMR techniques were used in the structure elucidation and assignment of the different NMR resonances of these three acetylated compounds.     

Ag6(PMo10V2O40](CH3COO).8H2O: A 3D macrocationic polyoxometallic Keggin complex

Silver atoms and strongly interlinking Keggin units ensure the tridimensionnal macrocationic structure of [Ag(6)(PMo(10)V(2)O(40))](CH(3)COO).8H(2)O, which catalyzes O(2)-based oxidation of p-methoxytoluene in acetic acid by air.     

Synthesis of ethyl acetate by esterification of acetic acid with ethanol over a heteropolyacid on montmorillonite K10

In present work, liquid phase esterification of acetic acid with ethanol over dodecatungestophosphoric acid (DTPA) supported on K10 montmorillonite was systematically studied and optimization of process parameters was carried out. The 20% m/m DTPA/K10 was found to be the optimum catalyst with 90% acetic acid conversion and 100% ethyl acetate selectivity. The study was also explored to see the feasibility of 20% m/m DTPA/K10 as a catalyst for the alkylation of acetic acid with other alcohols like methanol, iso-propanol and n-butanol. The 20% m/m DTPA/K10 has shown increased activity with the increase in carbon number, at the same alcohol reflux. The results are novel.     

Cucurbit[10]uril

Melamine diamine 1 is able to displace CB[5] from the CB[10].CB[5] complex resulting in CB[10].12 and precipitated CB[5].1. We were able to isolate free CB[10] by treatment of CB[10].1 with acetic anhydride followed by washing with MeOH, DMSO, and water. The spacious cavity of CB[10] is able to complex large guests, including a cationic calix[4]arene derivative in its 1,3-alternate form (CB[10].1,3-alt-3). The addition of adamantane carboxylic acid (4) to CB[10].3 triggers a conformational change during the formation of termolecular complex CB[10].cone-3.4.     

Pyrimido[5,4-b]quinolines. III. Synthesis of 10-alkyl-substituted 10-deazaalloxazines

A general method for the synthesis of 10-alkyl-substituted 10-deazaalloxazines (VIII) and the related chemistry are described. 4-Alkyl-substituted 3-aminoquinolines (IV) were reacted with benzoyl chloride and potassium cyanide in methylene chloride-water mixture to obtain Reissert compounds (V) which were hydrolyzed with a mixture of hydrobromic acid and acetic acid, and subsequently with 20% potassium hydroxide to give the corresponding 3-aminoquinaldic acids (VII). Cyclization with urea gave the 10-deazaalloxazines (VIII). Oxidation, hydroxylation and alkylation reactions of the 10-methyl derivatives (VIIIa,b) and of their quinaldic acid precursors are also reported.     

2-氨基-10-羟基-5,10-二氢磷杂吖嗪-10-氧化物的合成、诱变性及应用

2-氨基-10-羟基-5;10-二氢磷杂吖嗪-10-氧化物的合成、诱变性及应用;二氢磷杂吖嗪; 吡唑啉酮; 合成; 结构鉴定; 诱变性     

Synthesis of 2,6-disubstituted piperidine alkaloids from ladybird beetles Calvia 10-guttata and Calvia 14-guttata

Optically pure (+)-calvine, (+)-2-epicalvine, (2S,6S)-(6-pentylpiperidin-2-yl)acetic acid methyl ester and (2R,6S)-(6-pentylpiperidin-2-yl)acetic acid methyl ester, four piperidine alkaloids isolated from ladybird beetles of the genus Calvia (Coccinellidae), were synthesised from a common precursor using cyclisative Pd(II)/Cu(II)-catalysed carboamination-(methoxy)carbonylation tandem reaction of alkenylamines as a key step. The first single-crystal X-ray analysis of (+)-calvine confirmed its proposed absolute configuration to be (2S,6S) corresponding to that of natural product.     

1,4,4a,10b-Tetrahydro-N,N-dimethyl-4-phenanthridinamines and 1,4,4a,5,6,10b-hexahydro-N,N-dimethyl-4-phenanthridinamines

Synthetic procedures to prepare the title compounds are described. Diels-Alder cycloaddition of β-nitrostyrene derivatives 5 to N,N-dimethyl-1,3-butadien-1-amine, 6 , gave 5-aryl-N,N-dimethyl-6-nitro-2-cyclohexen-1-amines 7. Reduction of 7 with zinc in acetic acid gave the diamino derivatives 8 . Schotten-Baumann acylation of 8 gave amides 9 . Treatment of 8 with alkyl isocyanates gave the aminourea derivatives 10 . Bischler-Napieralski cyclodehydration procudure of 9 and 10 gave 1,4,4a,10b-tetrahydrophenanthridinamines 3 and N⁶-alkyl-1,4,4a,10b-tetrahydro-N⁴,N⁴-dimethyl-4,6-phenanthridinediamines 11 , respectively. Condensation of diamines 8 with aryl aldehydes under azeotropic conditions gave imines 12 which on treatment with acids yielded 6-aryl-1,4,4a,5,6,10b-hexahydro-N,N-dimethyl-4-phenanthridinamines 4 . The stereochemistry of these materials is assigned from the proton magnetic resonance studies.     

Synthesis and acid-base transformations of 8-substituted 10-phenyl-10-hydroxy-10H- pyrido [2,3-b ]chromenes

The corresponding 2-(p-substituted phenoxy)-3-aroylpyridines were obtained by the reaction of 2-(p-substituted phenoxy)nicotinonitriles with phenylmagnesium bromide. It is shown that they are readily cyclized to 8-substituted 10-phenyl-10-hydroxy-10H-pyrido[2,3-b]chromenes by the action of concentrated sulfuric acid in glacial acetic acid. The pK_R+ values of the cyclization products, which range from–7.70 to –10.83 and correlate with the _p ⁰ substituent constants, were determined by spectrophotometry.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 5, pp. 614–616, May, 1982.     

Formation of n-1 substituted alloxazine derivative from 7,8-dimethyl-10-formylmethylisoalloxazine in cetic acid.

The new alloxazine derivative formed from 7,8-dimethyl-10-formylmethyl-isoalloxazine in acetic acid has been isolated; structure and mechanism of formation have been proposed.     

Determination of acetic acid in aqueous samples, by water-phase derivatisation, solid-phase microextraction and gas chromatography

The direct derivatisation of acetic acid with n-hexyl chloroformate and with benzyl bromide in water was evaluated. With n-hexyl chloroformate, acetic acid did not give the n-hexyl acetate derivative, but the reaction of acetic acid with benzyl bromide in aqueous solution resulted in the formation of benzyl acetate. The derivatisation of acetic acid with benzyl bromide and the headspace solid-phase microextraction (SPME) of benzyl acetate were optimised. Under optimum conditions, the limit of detection for acetic acid was 260 nM, and the relative standard deviation of the overall procedure at 1.10(-4) M acetic acid was 15.6% (n = 10). A linear response was obtained in the 1 x 10(-4) to 5 x 10(-6) M concentration range (R2 = 0.993, n = 6). Although Carbowax-divinylbenzene (CW-DVB)-coated fibres exhibited a higher extraction capacity for benzyl acetate, polyacrylate (PA) was selected, because its mechanical stability was better than that of CW-DVB fibres. Moreover, the relative standard deviation of the SPME was better with PA (1.5%, n = 10 at 1 x 10(-5) M) than with CW-DVB-coated fibres (8.0%, n = 10 at 1 x 10(-5) M). Thus, a new analytical method for the quantitative determination of micromolar concentrations of acetic acid in the aqueous phase was developed. This method is based on water-phase derivatisation with benzyl bromide, headspace SPME with PA fibres and GC-FID. It was observed experimentally that benzyl alcohol formed by hydrolysis of the reagent affected the fibre-gas phase partitioning of benzyl acetate.     

高效液相色谱法同时测定化妆品中的10种合成着色剂

建立了高效液相色谱同时测定化妆品中颜料橙5、酸性黄36、颜料红53、酸性紫49、罗丹明B、溶剂蓝35、苏丹红Ⅱ、苏丹红Ⅳ、分散黄3和颜料红57等10种合成着色剂的方法。用四氢呋喃(THF)、二甲基亚砜(DMSO)和甲醇对样品进行分步超声辅助萃取、离心净化后,在Eclipse XDB-C₁₈(150 mm×4.6 mm, 5 μm)色谱柱上分离。用乙腈-0.02 mol/L乙酸铵溶液(用乙酸调pH至4.60)作为流动相进行梯度洗脱,二极管阵列检测器(DAD)检测。在0.5~20.0 mg/L范围内,10种着色剂的峰面积与质量浓度呈线性关系,相关系数(r)大于0.999;定量限(LOQ)为10~20 mg/kg。在3个添加水平的回收率均在92.9%~108.8%之间,相对标准偏差(RSD)为0.5%~6.1%(n=6)。该方法简便、快速、灵敏,适合油状、粉状和膏状化妆品中禁限用着色剂的定量检测。     

Design of the Synthesis of Steroidal 1,3,5(10),9(11)-Tetraenes via Isomerization of 1,3,5(10),8-Isomers - effect of the Solvent System

p-Toluenesulphonic acid catalytic isomerization of 1,3,5(10),8-tetraene steroids in benzene or toluene with the presence of acetic acid is established as a simple high-yield (85～89%) procedure to the synthesis of the corresponding 9(11)-isomers. The solvation effect is discussed for the design of the new reaction media.     

Synthesis of representative 10-aryl-, 10-aralkyl- and 10-heteraryl-9H-naphtho[1′,2′:4,5]thiazolo[3,2-b]- [1,2,4]triazin-9-ones as potential anti-HIV agents

To prepare the title compounds, cyclocondensation of 1-amino-2-iminonaphtho[1,2-d]thiazole ( 2 ) with some representative glyoxylic acid derivatives was investigated. Heating 2 with methyl phenylglyoxylate ( 3a ) in methanol afforded only the open chain intermediates 4a,b . However, when this reaction was performed in re-fluxing glacial acetic acid, the expected compound, 10-phenyl-9H-naphtho[1′,2′:4,5]thiazolo[3,2-b][1,2,4]- triazin-9-one ( 5a ) was produced in 27% yield. Similar treatment of 2 with benzyl-, 2-furyl- and 2-thienylgly-oxylic acids 3b-d gave the corresponding 10-benzyl-, 10-(2-furyl)- and 10-(2-thienyl)-9H-naphtho[1′,2′:4,5]thi-azolo[3,2-b][1,2,4]triazin-9-ones 5b-d in 48–67% yields. As by-products, 9-benzoyl- and 9-(2-thenoyl)naphtho-[1′,2′:4,5]thiazolo[3,2-b][1,2,4]triazoles 6a,d were also isolated. Compound 5a was selected for in vitro anti-HIV evaluation but found to be inactive.     

Five-membered 2,3-dioxoheterocycles. 10. Reaction of 5-aryl-2,3-dihydrofuran-2,3-diones with N-substituted ureas and their thio and seleno analogs

3-Aryl-5-phenacylideneimidazolidine-2,4-diones, 3-aryl-5-phenacylidene-4-oxoimidazolidine-2-thiones, and 5-phenacylidene-4-oxoimidazolidine-2-selenones were obtained from 5-aryl-2,3-dihydrofuran-2,3-diones and arylureas, arylthioureas, and selenoureas respectively in glacial acetic acid. In the reaction of 5-aryl-2,3-dihydrofuran-2,3-diones with cyanoguanidine in 98% acetic acid 5-phenacylideneimidazolidine-2,4-diones were isolated, and in anhydrous acetic acid 2-imino-3-amidino-5-phenacylidene-4-oxazolidones were isolated. When heated in a water-dioxane solution of hydrochloric acid, the latter are converted into 5-phenacylideneimidazolidine-2, 4-diones.For Communication 9, see [1].Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1411–1413, October, 1988.     

Synthesis of 4H-1,3,4-oxadiazino[5,6-b]quinoxalines from 2-substituted quinoxaline 4-oxides

The reaction of 6-chloro-2-(1-methylhydrazino)quinoxaline 4-oxide 8 with acetic anhydride resulted in the intramolecular cyclization to give 8-chloro-2,4-dimethyl-4H-1,3,4-oxadiazino[5,6-b]quinoxaline 7a , while the reaction of compound 8 with acetic anhydride/pyridine or acetic anhydride/acetic acid afforded 3-(2,2-diacetyl-1-memymydrazmo)-7-chloro-2-oxo-1,2-dihydroquinoxaline 9 , effecting no intramolecular cyclization. The reaction of 2-(2-acetyl-1-methylhydrazino)-6-chloroquinoxaline 4-oxide 10a or 6-chloro-2-(1-methyl-2-trifluoroacetylhydrazino)quinoxaline 4-oxide 10b with phosphoryl chloride provided compound 7a or 8-chloro-4-memyl-2-trifluoromethyl-4H-1,3,4-oxadiazino[5,6-b]quinoxaline 7b , respectively. The reaction of compound 7b with phosphorus pentasulfide gave 7-chloro-3-(1-methyl-2-trifluoroacetylhydrazino)-2-thioxo-1,2-dihydroquinoxaline 11 , whose dehydration with sulfuric acid in acetic acid afforded 8-chloro-4-methyl-2-trifluoromemyl-4H-1,3,4-thiadiazino[5,6-b]quinoxaline 12 .