中国化学快报

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A Novel Condensation Reaction of Alkyl Aryl Ketone with Ethyl Ortho-Formate under Microwave Irradiation

Jian Hua YU, Yu Lai HU, Shi Yan YANG, Yuan Qi YIN, Li Ping CAI

中国化学快报. 1998, 9(01): 1-4.

摘要 ( )

可视化

Under microwave irradiation, boron trifluoride has been found to mediate a novel condensation reaction of alkyl aryl ketone with ethyl ortho-formate to give a series of new condensa-tion products (5,6,7,8). Their structures were determined by IR, ¹H-/¹³C-NMR, MS spectra, and the crystal structure of 8 was further defined by X-ray diffraction.

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Zinc-Mediated Addition of Bromoacetonitrile to Aldimines

Xing Hua SUN, Lei WANG, Yong Min ZHANG

中国化学快报. 1998, 9(01): 5-6.

摘要 ( )

可视化

In the presence of chlorotrimethylsilane, zinc-mediated addition of bromoacetonitrile to aldimines gives β-aminonitriles in THF with good yields.

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Facile Bromination of Aromatic Ethers with Quaternary Ammonium Bromide and Iodosylbenzene

Yu Lin JIANG, Ying Cheng LI, Bao Gong YANG, Da Bin GAO, Ji Ye TAN, Yun Cheng YUAN

中国化学快报. 1998, 9(01): 7-9.

摘要 ( )

可视化

Aromatic ethers were conveniently brominated with quaternary ammonium bromide and iodosylbenzene in glacial acetic acid under mild conditions to give the corresponding monobromo-aromatic ethers in nearly quantitative yields.

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A Facile Synthesis of N-Substituted Spirocyclic Diester of α-Aminophosphonic Acid

Qing DAI, Hua WO, Ru Yu CHEN

中国化学快报. 1998, 9(01): 10-12.

摘要 ( )

可视化

A simple and direct method for preparation of N-substituted spirocyclic diester of □-amino phosphonic acid (4) in high yield is introduced. The reaction consists of the three-component reaction of phenylurea (1), an aromatic aldehyde (2), and 3,9-dichloro-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5,5] undecane (3) in anhydrous benzene.

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Selective Modification of β-Cyclodextrin on the Secondary Side 4:Preparation of Arylated β-Cyclodextrins with a Flexible Chain

Ai You HAO, Lin Hui TONG, Min ZHU

中国化学快报. 1998, 9(01): 13-16.

摘要 ( )

可视化

Mono 3-deoxy-(N'-benzoyl-ethylenediamino)-P-CD, mono 3-deoxy-(N'-benzimidoy 1-ethylamino)-β-CD, and mono S-deoxy-(N'-salicylidene-ethylenediamino)-β-CD, each of which has a flexible chain that bonds the aryl moiety on the secondary side of β-CD, were prepared in this research. The reaction processes might involve the formation of mono(2,3-manno-epoxide)-p-CD as an intermediate in our reaction conditions.

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Synthesis of Two New Types of N-Phenyl and N,N'-Diphenyl Azathiacrown Ether Analogs

Chang Rong NIU, Hua JIANG, Cheng Tai WU

中国化学快报. 1998, 9(01): 17-20.

摘要 ( )

可视化

Two types of N-phenyl and N,N'-diphenyl azathiacrowii ether analogs, which contain two sulfur atoms, one or two oxygen atoms, and one or two nitrogen atoms, were synthesized by the reaction of an appropriate halide with a corresponding a,ω-dithiol. They were further deter-mined by IR, ¹HNMR, and MS.

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Synthesis of Triphenyltin 2-(1, 2-Ethylenedithio) Methylene-3-Oxo-5-Aryl-4-Pentenoate

Jian Xin LI, Qun LIU, Mei Xin ZHAO, Jing Fu LIU, Shang Yu LI, Yan HE

中国化学快报. 1998, 9(01): 21-22.

摘要 ( )

可视化

Under esterification conditions, 2-(1,2-ethylenedithio) methylene-3-oxo-5-aryl-4-pentenoic acid 3 afforded the decarboxylated products 4. The triphenyltin 2-(1, 2-ethylenedithio) methylene-3-oxo-5-aryl-4-pentenoates 5 were obtained in high yields when 3 reacted with triphenyltin hydroxide.

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Synthesis of CMC-Multipeptide Conjugate

De Xin WANG, Lei HUANG

中国化学快报. 1998, 9(01): 23-24.

摘要 ( )

可视化

The synthesis of carboxymethyl cellulose (CMC)-multipeptide conjugate is reported in the present paper. This new type of peptide-polymer surrogate possesses some merits, such as ease of synthesis, high density of peptide, and the possibility of increased bioavailability, and seems to have promising uses in drug development.

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Reductive Cleavage of the S-Si Bond in Phenylthio-trimethylsilane:A Novel Method for the Synthesis of Thiolesters

Song Lin ZHANG, Yong Min ZHANG

中国化学快报. 1998, 9(01): 25-27.

摘要 ( )

可视化

Phenylthiotrimethylsilane is reduced by samarium diiodide to yield samarium phenylthiolate. This new thiolate anion species reacts with acyl chlorides mildly to give thiolesters in good yields.

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The Ephemeral 10β-OH Trifluoromethanesulfonates of 7-Epi Paclitaxel Analogs-A New Example for Anchimeric Assistance

Wei Shuo FANG, Qi Cheng FANG, Xiao Tian LIANG

中国化学快报. 1998, 9(01): 29-33.

摘要 ( )

可视化

Two rearranged products, dienone 4 and 10-oxo product 5 were obtained upon at-tempted 10p-OSO₂CF₃ formation from 3. The formation of compound 5 can be explained by an-chimeric assistance of 7α-OH. Reduction of 4 yielding a 4-deacetyl product (12) also involves neighboring group participation.

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Synthesis of the C_11-16+C₂₇ Segment of Epothilone A

Zhi Yu LIU, Rui Fang WANG, Yue Hai SHEN

中国化学快报. 1998, 9(01): 35-38.

摘要 ( )

可视化

A chiral synthesis of the C_11-16+C₂₇ segment of epothilone A is described using inex-pensive L-(-)-malic acid as starting materinal and using Sharpless asymmetric epoxidation for in-troduction of the desired 12,13 epoxide.

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Microbial Transformation of Taxoids and Synthesis of Taxoids ith an Oxetane Ring

Shang Hui HU, Xu Fang TIAN, Wen Yi HE, Man KONG, Di An SUN, Qi Cheng FANG

中国化学快报. 1998, 9(01): 39-43.

摘要 ( )

可视化

Microbial transformation of taxoids was investigated:taxoid 2 was transformed into 1β and 14β hydroxylated derivatives 3 and 4; unnatural taxoid 6 was transformed into 1β-hydroxy derivative 7 and 11(15→1) abeotaxane 8. Taxoids with an oxetane ring, 11-13 were synthesized from 1 via chemical reactions.

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Two New Taxane Diterpenoids from Taxus Chinensis

Jing Yu LIANG, Kai Sheng HJANG, A. A. Leslie GUNATILANA, Lu YANG

中国化学快报. 1998, 9(01): 45-49.

摘要 ( )

可视化

Two new taxane diterpenoids, 2-deacetoxy-7,9-dideacetyltaxinine J (1) and 2-deacetoxy-taxinine B (3), were isolated from the barks of Taxus chinensis. Their structures were elucidated by spectroscopic methods.

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Three New Compounds from Forsythia Suspensa (Thunb.) Vahl

Dong Sheng MING, De Quan YU, Shi Shan YU

中国化学快报. 1998, 9(01): 51-55.

摘要 ( )

可视化

Three new compounds, suspenolic acid (1),forsythenside A (2),and forsythenside B (3) have been isolated from the fruits of Forsythia suspensa. Their structures were elucidated by spectral methods including IR, ¹H-and ¹³C-NMR, DEPT, ¹H-¹H COSY, ¹H-¹³C COSY, NOE difference, HMBC, FABMS, CIMS, and chemical reactions.

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Two New Norditerpenoid Alkaloids from Delphinium Souliei

Xuan PAN, Lan HE, Bo Gang LI, Yao Zu CHEN

中国化学快报. 1998, 9(01): 57-59.

摘要 ( )

可视化

Two new norditerpenoid alkaloids, souline A and souline B, were isolated from Delphinium souliei Franch, and their structures were elucidated by spectroscopic methods.

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Eremophilane Sesquiterpenes from Cacalia Roborowskii

Suo Ming ZHANG, Gui Ling ZHAO, Rong LI, Guo Qiang LIN

中国化学快报. 1998, 9(01): 61-64.

摘要 ( )

可视化

Four new eremophilane type sesquiterpenes were isolated from the roots of Cacalia roborowskii (Maxim) Ling. Their structures were established as 8-oxo-eremophila-6, 9-dien-12-oic acid (1), 3β-acetoxyl-8-oxo-eremophila-6, 9-dien-12-oic acid (2), 3β-aiigeloyoxyl-8-oxo-eremophila-6, 9-dien-12-oic acid (3) and 3β-(2-methylbutyryloxyl)-8-oxo-eremophila-6, 9-dien-12-oic acid (4) by means of ID and 2D NMR spectroscopy.

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Eremophilenolides from Cacalia Roborowskii

Suo Ming ZHANG, Gui Ling ZHAO, Guo Qiang LIN

中国化学快报. 1998, 9(01): 65-68.

摘要 ( )

可视化

From the extracts of the roots of Cacalia roborowskii (Maxim) Ling, five new eremo-philenolides were isolated and their structures identified as 8β, 10β-dihydroxy-6β-methoxyleremophilenolide (1), 3β-acetoxyl-8β, 10β-dihydroxy-6p-methoxyeremophilenolide (2), 3β-angeloyloxy-8β-, 10β-dihydroxy-6p-methoxyeremophilenolide (3), 3β-(2-methylbutyryloxy)-8β, 10β-dihydroxy-6β-methoxyeremophilenolide (4), and 8β-hydroxy-6β-methoxyeremophil-7(11), 9-dien-8, 12-olide (5), based on ID and 2D NMR experiments.

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A New Chromone Glycoside from Bupleurum Chinense

Hong LIANG, Yu Ying ZHAO, Ru Yi ZHANG

中国化学快报. 1998, 9(01): 69-70.

摘要 ( )

可视化

A new chromone glycoside, saikochromoside A(1), was isolated from the roots of Bupleurum chinense DC. Its structure was determined on the bases of chemical and spectral analyses.

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New Isoflavonoside from Bupleurum Scorzonerifolium

Li TAN, Yu Ying ZHAO, Bin WANG, Ru Yi ZHANG, Guang Zhong TU

中国化学快报. 1998, 9(01): 71-73.

摘要 ( )

可视化

A new isoflavonoside, 7-hydroxy-4'-methoxy-isoflavonone-7-0-β-D-glucopyranosyl-(1→6)-β-D-glucopyranoside was isolated from roots of Bupleurum scorzonerifolium Willd., and named as saikoisoflavonoside A. The structure was determined by spectroscopic methods.

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The Synthesis and Electronic Characteristics of Poly(p-Phenylene Vinylene) Derivatives

Jian Ying WANG, Yin Kui LI, Wen Xiang HU, Sheng Jian TAN, Yong Fu LONG

中国化学快报. 1998, 9(01): 75-77.

摘要 ( )

可视化

A series of soluble poly(p-phenylene vinylene) (PPV) derivatives were synthesized through dehydrochlorination with the p-methoxy phenol as starting materials. The electronic characteristics of PPV derivatives were studied.

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The Synthesis of Soluble Copolymer of Poly(p-Phenylene Vinylene)

Jian Ying WANG, Yin Kui LI, Wen Xiang HU, Sheng Jian TAN, Yong Fu LONG

中国化学快报. 1998, 9(01): 79-81.

摘要 ( )

可视化

Appling the dehydrochlorination reaction, the copolymerization of 1, 4-bis(chloromethyl)-2, 5-dimethyl benzene and 1,4-bis(chloromethyl)-2-methoxy-5-hexyloxyl benzene was studied. The solubility of the copolymer was determined by the structure and molar ratio of two monomers. The structure of the copolymer was identified by UV, IR, and ¹H NMR analyses.

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Effects of Al(i-Bu)₃ on Propylene Polymerization and Copolymerization by rac-Me₂Si(Ind)₂ZrCl₂/MAO

Zhi Qiang FAN, Yong Hui ZHANG, Qi WANG, Lin Xian FENG

中国化学快报. 1998, 9(01): 83-85.

摘要 ( )

可视化

The effects of adding Al(i-C₄H₉)₃ (TEA) to rac-Me₂Si(Ind)₂ZrCl₂/MAO catalyzed propylene-1-octene copolymerization were studied. At TBA/MAO(Al/Al mole ratio) of about 0.6, the polymerization activity was found to be much higher than the system without TBA. In-creases of polymer molecular weight and 1-octene content from addition of TBA were also ob-served.

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Improvement of Selectivity with Boric Acid in Separating Phenolic Acids by Capillary Zone Electrophoresis

Hong LONG, Ai Jin HUANG, Yi Liang SUN

中国化学快报. 1998, 9(01): 87-91.

摘要 ( )

可视化

It was shown that in capillary electrophoresis (CE) the addition of boric acid as a complexing agent in phosphate buffer can modulate the separation selectivity of phenolic acids.

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Specific Mass Spectrometric Fragmentations from the Dissociation of Intermediate Ion-Neutral Complexes

Yi Min SHE, Jun Hua WEI, Ya Ping TU, Shu Ying LIU

中国化学快报. 1998, 9(01): 93-97.

摘要 ( )

可视化

It is reported that two kinds of specific mass spectrometric fragmentations are generated from dissociations of the intermediates of both the ion-neutral complex and the proton-bound complex. Collision-induced dissociation, isotopic labelling, and semi-empirical AMI calculations were used to investigate the formation mechanism of the ion of m/z 139 from ionized tetrahydroimi-dazole-substituted methylene β-diketones and the unimolecular fragmentations pathway of 3-phenyl-1-butyn-3-ol upon electron impact.

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Positive Shifts of the Reduction Potentials of C₆₀ by Substitution of Cyanogens

Lou Zhen FAN, Yong Fang LI, Feng Ying LI, Yu Liang LI, Dao Ben ZHU

中国化学快报. 1998, 9(01): 99-101.

摘要 ( )

可视化

The electrochemical properties of a new derivative of C₆₀ were investigated by cyclic voltammetry. It was found that the derivative was reduced at a more positive potential than C₆₀, reflecting its significance to accept electron easily. Its NIR characteristic absorption bands of monoanion and dianion were also obtained.

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Investigation of Ergosterol in situ Circular Dichroic Spectroelectrochemistry

Yu Juan Lu, Yong Chun Zhu, Guang Jin Cheng, Shao Jun Dong

中国化学快报. 1998, 9(01): 103-106.

摘要 ( )

可视化

In the present paper, the electrochemical behavior of ergosterol has been investigated by in situ circular dichroism (CD) spectroelectrochemistry with long path-length thin layer cell. E⁰(1.02V), αn_α(0.302) of the electroxidation process of ergosterol were obtained from the CD spec-troelectrochemical data. The mechanism of the electroxidation process of ergosterol is suggested.

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Study on the Direct Photooxidation of Near-Infrared Absorbing Benzothiazolone Cyanine Dye

Jun LI, Ping CHEN, De Shui ZHENG, Tsuneki OKASAKI, Masaaki HAYAMI

中国化学快报. 1998, 9(01): 107-110.

摘要 ( )

可视化

In this paper, direct photooxidation of benzothiazolone cyanine dye in acetonitrile was studied. The photoproducts had been identified by ¹HNMR and fast atom bombardment (FAB) mass spectrometry. The results showed that the N-ethylbeiizothiazolone (Ⅰ), the ionic acid (Ⅱ), and ionic aldehyde (Ⅲ) are the principal photoproducts.

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Synthesis and Crystal Structure of a Novel (2:2) Macrocyclic Thiocarbohydrazone

Hao ZHANG, Fu Xin XIE, Yu Peng TIAN, Xu Hui ZHU, Yin Han ZHANG, Chun Ying DUAN, Shi Sheng NI

中国化学快报. 1998, 9(01): 111-112.

摘要 ( )

可视化

The first reported X-ray crystal structure of a new (2:2) macrocyclic thiocarbohydrazone, effectively derived from thiocarbohydrazide and di(2-formylphenoxy)ethylene is shown.

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1998年, 第9卷, 第01期　刊出日期：1998-01-20

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1998年, 第9卷, 第01期 刊出日期：1998-01-20

1998年, 第9卷, 第01期　刊出日期：1998-01-20