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598 Aktuelle Fachpublikationen in Letters in Organic Chemistry

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Synthesis of 2-Substituted Benzimidazoles Catalyzed by FeCl3/Al2O3 Under Ultrasonic Irradiation

12.12.2011 | Chen, Guo-Feng; Dong, Xiao-Yun; Meng, Fan-Zhu; Chen, Bao-Hua; Li, Ji-Tai; Wang, Shu-Xiang; Bai, Guo-Yi, Letters in Organic Chemistry, 2011

Abstract: 2-substituted benzimidazoles have been synthesized in a single pot from aromatic aldehydes and ophenylenediamine catalyzed by FeCl3/Al2O3 in DMF under ultrasonic irradiation and afforded good yields in a short period of time.

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Facile Synthesis of Bis(indolyl)alkanes Catalyzed by Cu(ClO4)2.6H2O Under Solvent Free Conditions

12.12.2011 | Baruah, Mukulesh, Letters in Organic Chemistry, 2011

Abstract: Copper perchlorate hexahydrate is found to be an efficient catalyst for the electrophilic substitution of indole with carbonyl compounds to prepare bis(indolyl)methane derivatives without solvent in excellent yield at room temperature.

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Unexpected Formation of Indenoisoquinoline Derivatives from Thia Analogues of Protoberberine Alkaloids

12.12.2011 | Fodor, Lajos; Csomos, Peter; Molnar, Judit; Zupko, Istvan; Csampai, Antal; Sohar, Pal, Letters in Organic Chemistry, 2011

Abstract: Treatment of thia analogues of protoberberine alkaloids, 13-carboxy-13,13a-dihydro-6H,8H-isoquinolino [2,3-c][1,3]benzothiazin-8-ones, with thionyl chloride, followed by ethanol, unexpectedly provided 5,11-dioxoindeno [1,2-c]isoquinoline derivatives containing a novel ring system. ...

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Synthesis of Some Cyclic Methylene 1,3-Diaza Barbiturates Derivatives

03.12.2011 | Sweidan, Kamal; Engelmann, Jorn; Joshi, Rajendra; S Mubarak, Mohammad; M El-Abadelah, Mustafa, Letters in Organic Chemistry, 2011

Abstract: The reaction of 1,3-dimethyl-5-bis(thioethyl)methylene barbituric acid (2) with various vic-diamines leads to the formation of the respective 1,3-diazamethylene barbiturate derivatives 3 (a-f) in high yields. Solid-state 13C-NMR, MS and IR spectral data were employed for the ...

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L-Proline-Derived Tertiary Amino Alcohols as Chiral Ligands for Enantioselective Addition of Diethylzinc to Aldehydes

03.12.2011 | Xu, Zhou; Bo, Rongcheng; Wu, Nan; Wan, Yu; Wu, Hui, Letters in Organic Chemistry, 2011

Abstract: A series of L-proline derived tertiary amino alcohols was used as chiral ligands in the asymmetric addition reaction of Et2Zn to aldehydes. Among these ligands, it was found that ligand 1b which has the biggest steric and electrondonating substituent at the nitrogen position ...

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Xanthan Sulfuric Acid: An Efficient Bio-Supported and Recyclable Solid Acid Catalyst for the Synthesis of 2-minothiazole-5-carboxylates and 2-aminoselenazole-5-carboxylates

03.12.2011 | S Kuarm, Bowroju; V Madhav, Janganati; Rajitha, Bhargavi, Letters in Organic Chemistry, 2011

Abstract: An efficient method has been developed for the synthesis of 2-amino thiazole and selenazole-5-carboxylates from β-ketoesters, thiourea or seleno urea and N-bromo succinamide by using Xanthan sulfuric acid as a solid acid catalyst. The reaction work-up is very simple and the ...

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Microbial Oxidation of 1,2-Diols Bearing a Substituent with an Oxyfunctional Group: Preparation of Optically Active 1,2-Diols and -Hydroxy Ketones

03.12.2011 | Matsumoto, Kazutsugu; Hashimoto, Key; Sakuragi, Mari; Kusunoki, Ayumi; Nogawa, Masaki, Letters in Organic Chemistry, 2011

Abstract: The preparation of optically active 1,2-diols bearing a substituent with a benzyloxy group at the terminus has been achieved by microbial enantioselective oxidation of the racemic compounds. In the screening test, Ochrobactrum sp. MU2293 was selected as the best strain to perform ...

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Enantioselective Michael Addition of Malonates to Aromatic ,-Unsaturated Aldehydes Organocatalyzed by (S)-2-[bis(3,4,5-Trifluorophenyl) trimethylsilanyloxymethyl]pyrrolidine

03.12.2011 | Ye, Haiwei; Zheng, Yemin; Yu, Chuanming; Zhong, Weihui, Letters in Organic Chemistry, 2011

Abstract: The Michael addition of malonates to aromatic α,β-unsaturated aldehydes was efficiently organocatalyzed by (S)-2-[bis(3,4,5-trifluorophenyl)trimethylsilanyoxymethyl]pyrrolidine, derived from L-proline to afford the corresponding adducts in good yields with good to excellent ...

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One-Pot, Solvent Free Synthesis of Hantzsch 1, 4-Dihydropyridines Using -Cyclodextrin as a Supramolecular Catalyst

03.12.2011 | R Patil, Dipak; S Dalal, Dipak, Letters in Organic Chemistry, 2011

Abstract: A novel, solvent free and efficient one pot synthesis of 1, 4-dihydropyridine derivatives was achieved in good yields via three component reaction of aldehydes, ethyl acetoacetate and ammonium acetate using inexpensive β- cyclodextrin as a supramolecular catalyst. The catalyst can ...

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Synthesis of Dendritic Tryptophan Derivatives and Investigation on Dendritic Effects of their Fluorescence and Reactivity

03.12.2011 | He, Dongsheng; He, Gu; Guo, Li, Letters in Organic Chemistry, 2011

Abstract: Two series of dendritic tryptophan derivatives have been synthesized and characterized, their emission spectra in different solvents and the reactivity of tryptophan were investigated and compared. There was a progressive shielding effect of the tryptophan in the emissive ...

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