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220 Newest Publications of beilstein-institut-zur-foerderung-der-chemischen-wissenschaften

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Hyperbranched polyethylenimine bearing cyclodextrin moieties showing temperature and pH controlled dye release

18-Aug-2011 | Indra Böhm, Susanne Katharina Kreth and Helmut Ritter, Beilstein Journal of Organic Chemistry, 2011

Abstract The release of anthraquinone dyes from β-cyclodextrin modified, hyperbranched polyethylenimine (PEI-CD) was investigated. 5,8-Dichloro-1,4-dihydroxyanthraquinone (AQ-OH) was enclosed simply by ionic attraction between the phenolate groups of AQ-OH and the protonated amino groups of ...

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Continuous flow photolysis of aryl azides: Preparation of 3H-azepinones

17-Aug-2011 | Farhan R. Bou-Hamdan, François Lévesque, Alexander G. O'Brien and Peter H. Seeberger, Beilstein Journal of Organic Chemistry, 2011

Abstract Photolysis of aryl azides to give nitrenes, and their subsequent rearrangement in the presence of water to give 3H-azepinones, is performed in continuous flow in a photoreactor constructed of fluorinated ethylene polymer (FEP) tubing. Fine tuning of the reaction conditions using the ...

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Amine-linked diglycosides: Synthesis facilitated by the enhanced reactivity of allylic electrophiles, and glycosidase inhibition assays

16-Aug-2011 | Ian Cumpstey, Jens Frigell, Elias Pershagen, Tashfeen Akhtar, Elena Moreno-Clavijo, Inmaculada Robina, Dominic S. Al ..., Beilstein Journal of Organic Chemistry, 2011

Abstract Diglycose derivatives, consisting of two monosaccharides linked at non-anomeric positions by a bridging nitrogen atom, have been synthesised. Conversion of one of the precursor monosaccharide coupling components into an unsaturated derivative enhances its electrophilicity at the ...

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A practical microreactor for electrochemistry in flow

15-Aug-2011 | Kevin Watts, William Gattrell and Thomas Wirth, Beilstein Journal of Organic Chemistry, 2011

Abstract A microreactor for electrochemical synthesis has been designed and fabricated. It has been shown that different reactions can be carried out successfully using simple protocols. Beilstein J. Org. Chem. 2011, 7, 1108–1114.doi:10.3762/bjoc.7.127

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Efficient gold(I)/silver(I)-cocatalyzed cascade intermolecular N-Michael addition/intramolecular hydroalkylation of unactivated alkenes with α-ketones

11-Aug-2011 | Ya-Ping Xiao, Xin-Yuan Liu and Chi-Ming Che, Beilstein Journal of Organic Chemistry, 2011

Abstract The gold(I)/silver(I)-cocatalyzed cascade intermolecular N-Michael addition/intramolecular hydroalkylation reaction offers a simple and efficient method for the synthesis of pyrrolidine derivatives in moderate to excellent product yields and with moderate to good ...

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Reductive amination with zinc powder in aqueous media

10-Aug-2011 | Giovanni B. Giovenzana, Daniela Imperio, Andrea Penoni and Giovanni Palmisano, Beilstein Journal of Organic Chemistry, 2011

Abstract Zinc powder in aqueous alkaline media was employed to perform reductive amination of aldehydes with primary amines. The corresponding secondary amines were obtained in good yields along with minor amounts of hydrodimerization byproducts. The protocol is a green alternative to the use ...

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Recent developments in gold-catalyzed cycloaddition reactions

09-Aug-2011 | Fernando López and José L. Mascareñas, Beilstein Journal of Organic Chemistry, 2011

Abstract In the last years there have been extraordinary advances in the development of gold-catalyzed cycloaddition processes. In this review we will summarize some of the most remarkable examples, and present the mechanistic rational underlying the transformations. Beilstein J. Org. ...

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Novel synthesis of pseudopeptides bearing a difluoromethyl group by Ugi reaction and desulfanylation

08-Aug-2011 | Jingjing Wu, Hui Li and Song Cao, Beilstein Journal of Organic Chemistry, 2011

Abstract Thirteen difluoromethyl-containing pseudopeptides were synthesized by Ugi reaction using the novel building block 2,2-difluoro-2-(phenylthio)acetic acid (2) as one component, followed by removal of the phenylsulfanyl protecting group in the presence of tributyltin hydride and ...

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Homocoupling of aryl halides in flow: Space integration of lithiation and FeCl3 promoted homocoupling

02-Aug-2011 | Aiichiro Nagaki, Yuki Uesugi, Yutaka Tomida and Jun-ichi Yoshida, Beilstein Journal of Organic Chemistry, 2011

Abstract The use of FeCl3 resulted in a fast homocoupling of aryllithiums, and this enabled its integration with the halogen–lithium exchange reaction of aryl halides in a flow microreactor. This system allows the homocoupling of two aryl halides bearing electrophilic functional groups, such as ...

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Microphotochemistry: 4,4'-Dimethoxybenzophenone mediated photodecarboxylation reactions involving phthalimides

02-Aug-2011 | Oksana Shvydkiv, Kieran Nolan and Michael Oelgemöller, Beilstein Journal of Organic Chemistry, 2011

Abstract A series of 4,4'-dimethoxybenzophenone mediated intra- and intermolecular photodecarboxylation reactions involving phthalimides have been examined under microflow conditions. Conversion rates, isolated yields and chemoselectivities were compared to analogous reactions in a batch ...

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