Special Issue

Barry M. Trost's Special Issues, Vol. 67, No. 2, 2006

38 data found. 31 - 38 listedFirst Previous
Note | Special issue | Vol 67, No. 2, 2006, pp. 769 - 775
Published online: 18th October, 2005
DOI: 10.3987/COM-05-S(T)45
Facile Preparation of Substituted Benzimidazole-2-carboxylates

Yongbao Zhu, Krystyna A. Skupinska, and Ernest J. McEachern*

*Department of Chemistry, AnorMED, Inc., #200-20353 64th Ave., Langley, B. C., V2Y 1N5, Canada

Abstract

Mild conditions for the preparation of benzimidazole-2-carboxylates have been developed. Condensation of a substituted 1,2-phenylenediamine with methyl trichloroacetamidate in the presence of TFA rapidly affords the 2-trichloromethylbenzimidazole; hydrolysis provides the desired product.

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Note | Special issue | Vol 67, No. 2, 2006, pp. 777 - 784
Published online: 8th November, 2005
DOI: 10.3987/COM-05-S(T)49
Regioselective Synthesis of 4-Alkylpyridines from Pyridine and Aldehydes via Dipole Reversal Process of 1,4-Dihydropyridine Phosphonate

Phil Ho Lee,* Kooyeon Lee, Jun Hwan Shim, Seong Guk Lee, and Sundae Kim

*Department of Chemistry, Kangwon National University, Chuncheon, Kangwon 200-701, Korea

Abstract

4-Alkylation of pyridine has been accomplished by the reaction of ylides, derivated from 1,4-dihydropyridine phosphonate via phosphonioalkoxycarbonylation of pyridine with aldehydes and subsequent elimination of diisopropyl phosphate followed by aromatization with potassium tert-butoxide.

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Note | Special issue | Vol 67, No. 2, 2006, pp. 785 - 790
Published online: 8th November, 2005
DOI: 10.3987/COM-05-S(T)62
Synthesis and Spectral Properties of Azaterrylene Dicarboximide Derivative

Yukinori Nagao, Yuko Ogihara, Masafumi Adachi,* and Kozo Kozawa

*Department of Industrial Chemistry, Faculty of Science and Technology, Science University of Tokyo, 2641 Yamazaki, Noda, Chiba 278-8510, Japan

Abstract

Azaterrylene dicarboximide derivative was prepared by the coupling of N-pentyl-9-tributylstannylperylene-1,8-dicarboximide with 5-bromo-1,8-dimethylisoquinoline in the presence of Pd(PPh3)4 and following ring closure reaction by using t-BuOK/DBN. Spectral properties in solution were investigated and analyzed by molecular orbital method.

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Note | Special issue | Vol 67, No. 2, 2006, pp. 791 - 796
Published online: 30th September, 2005
DOI: 10.3987/COM-05-S(T)68
Metachromins J and K, New Sesquiterpenoids from Marine Sponge Spongia Species

Yohei Takahashi, Masashi Tsuda, Jane Fromont, and Jun’ichi Kobayashi*

*Graduate School of Pharmaceutical Sciences, Hokkaido University, Kita 12 Nishi 6, Kita-ku, Sapporo, Hokkaido 060-0812, Japan

Abstract

Two new cytotoxic sesquiterpenoids, metachromins J (1) and K (2), have been isolated from an Okinawan marine sponge Spongia sp. (SS-1037). The structures of 1 and 2 were elucidated on the basis of the spectroscopic data.

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Note | Special issue | Vol 67, No. 2, 2006, pp. 797 - 805
Published online: 18th November, 2005
DOI: 10.3987/COM-05-S(T)72
Pyridine-derived Heterocycles as Potential Photoacylating Reagents

Céline Helgen and Christian G. Bochet*

*Department of Chemistry, University of Fribourg, 9 Ch. du Musée, CH-1700 Fribourg, Switzerland

Abstract

We prepared several pyridine-derived heterocycles and investigated their photoacylating properties. Among representatives of 4 families of compounds (1-acetyl-7-azaindole, 1-acetyl-7-azaindoline, 2-acetamindpyridine and 2-amidopyrimidines), the 2-aminopyrimidine derivatives were the most promising candidates. Photoacylation of dodecylamine yields up to 47% were obtained, upon irradiation with UV light at 254 nm.

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Note | Special issue | Vol 67, No. 2, 2006, pp. 807 - 814
Published online: 28th October, 2005
DOI: 10.3987/COM-05-S(T)78
Novel Methods of Synthesizing Naphtho[1,2-c]furan-1,3-dione and Benzo[e]isoindole-1,3-dione

Masahiro Mizuno* and Mitsuhisa Yamano

*Chemical Development Laboratory, Takeda Chemical Industries, Ltd., 17-85 Jusohonmachi 2-chome, Yodogawa-ku, Osaka 532-8686, Japan

Abstract

Convenient methods of synthesizing naphtho[1,2-c]furan-1,3-dione and benzo[e]isoindole-1,3-dione from phenylbutyric acid derivatives have been established. Naphtho[1,2-c]furan-1,3-dione and benzo[e]isoindole-1,3-dione were obtained respectively from 4,5-dihydronaphtho[1,2-c]furan-1,3-dione and 4,5-dihydrobenzo[e]isoindole-1,3-dione by aromatization with 10% Pd-C in AcOH under mild conditions. In addition, benzo[e]isoindole-1,3-dione derivatives were obtained from 4,5-dihydronaphtho[1,2-c]furan-1,3-dione by imidation and simultaneous aromatization with primary amine in AcOH in one pot.

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Note | Special issue | Vol 67, No. 2, 2006, pp. 815 - 822
Published online: 14th October, 2005
DOI: 10.3987/COM-05-S(T)79
Cycloaddition Reactions of 1-Azadienes Derived from Hydrazones with Electron-deficient Dienophiles

Francisco Palacios,* Domitila Aparicio, Yago Lópes, and Jesús M. de los Santos

*Departamento de Química Orgánica I, Facultad de Farmacia, Universidad del País Vasco, Apto. 450, 01080 Vitoria, Spain

Abstract

The aza-Diels-Alder reaction of 1-aza-1,3-butadienes derived from hydrazones, with electron-deficient dienophiles is reported. When there is not substitution at C-2 in the starting 1-azadiene, fused-pyridine derivatives are obtained. However, the use of 1-azadienes substituted with a methyl group at C-2 gave the corresponding pyridazinone derivative.

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Review | Special issue | Vol 67, No. 2, 2006, pp. 823 - 837
Published online: 30th September, 2005
DOI: 10.3987/REV-05-SR(T)2
Phosphate Mimic of Nucleotides, Conformational Influences on the Ribofuranose Conformations

Arnaud Gautier

*IRCOF-UPRES A 6014, Faculty of Sciences, University of Rouen, Rue Tesnières, F-76821 Mont Saint Aignan Cedex, France

Abstract

The influences of the modifications of the natural nucleotides is rationalized in terms of stereoelectronics effects. This article reviews the pseudorotation concept and the Generalized Karplus Type equation used to quantify the conformational behavior of ribofuranose in solution.

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