Org. and Biomol. Chem.

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Cascade nitrosation and addition-elimination of nitroacetanilides for the highly efficient synthesis of 1,4,2,5-dioxadiazine derivatives

2 June, 2014 - 22:54

Org. Biomol. Chem., 2014, 12,4192-4200
DOI: 10.1039/C3OB42487A, PaperShanyan Mo, Peipei Huang, Jiaxi Xu
An efficient synthesis of 1,4,2,5-dioxadiazine-3,6-dicarboxamides via cascade nitrosation and addition-elimination of nitroacetanilides.
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Rhodium(III)-catalyzed formal oxidative [4 + 1] cycloaddition of benzohydroxamic acids and [small alpha]-diazoesters. A facile synthesis of functionalized benzolactams

2 June, 2014 - 22:54

Org. Biomol. Chem., 2014, 12,4112-4116
DOI: 10.1039/C4OB00512K, PaperHon-Wah Lam, Ka-Yi Man, Wai-Wing Chan, Zhongyuan Zhou, Wing-Yiu Yu
A mild and regioselective Rh(III)-catalyzed oxidative [4 + 1] cycloaddition of benzohydroxamic acids and [small alpha]-diazoesters for the synthesis of benzolactam is described.
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Non-stoichiometric O-acetylation of Shigella flexneri 2a O-specific polysaccharide: synthesis and antigenicity

2 June, 2014 - 22:54

Org. Biomol. Chem., 2014, 12,4218-4232
DOI: 10.1039/C3OB42586J, PaperCharles Gauthier, Pierre Chassagne, Francois-Xavier Theillet, Catherine Guerreiro, Francoise Thouron, Farida Nato, Muriel Delepierre, Philippe J. Sansonetti, Armelle Phalipon, Laurence A. Mulard
Synthetic functional mimics of the O-antigen from Shigella flexneri 2a are seen as promising vaccine components against endemic shigellosis.
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Copper-catalyzed bis-arylations of alkenes leading to oxindole derivatives

2 June, 2014 - 22:54

Org. Biomol. Chem., 2014, 12,4070-4073
DOI: 10.1039/C4OB00576G, CommunicationLiangliang Shi, Yuyuan Wang, Haijun Yang, Hua Fu
A simple and practical copper-catalyzed approach to oxindole derivatives by copper-catalyzed bis-arylation of N-alkyl-N-phenylacrylamides with diaryliodonium triflates has been developed under mild conditions, and the method is of tolerance towards some functional groups in the substrates.
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Zinc mediated allylations of chlorosilanes promoted by ultrasound: Synthesis of novel constrained sila amino acids

2 June, 2014 - 22:54

Org. Biomol. Chem., 2014, 12,4093-4097
DOI: 10.1039/C4OB00294F, CommunicationRemya Ramesh, D. Srinivasa Reddy
A simple, fast and efficient method for allylation and propargylation of chlorosilanes through zinc mediation and ultrasound promotion is reported. As a direct application of the resulting bis-allylsilanes, three novel, constrained sila amino acids are prepared for the first time.
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Quantum mechanistic insights on aryl propargyl ether Claisen rearrangement

2 June, 2014 - 22:54

Org. Biomol. Chem., 2014, 12,4163-4171
DOI: 10.1039/C4OB00388H, PaperVenkatesan Srinivasadesikan, Jiun-Kuang Dai, Shyi-Long Lee
The mechanism of aryl propargyl ether Claisen rearrangement in gas and solvent phase was investigated using DFT methods.
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Organocatalytic asymmetric decarboxylative cyanomethylation of isatins using L-proline derived bifunctional thiourea

2 June, 2014 - 22:54

Org. Biomol. Chem., 2014, 12,4186-4191
DOI: 10.1039/C4OB00271G, PaperV. Pratap Reddy Gajulapalli, Poopathy Vinayagam, Venkitasamy Kesavan
Asymmetric decarboxylative cyanomethylation of isatins using L-proline derived bifunctional thiourea to access cyanomethylated 3-hydroxyoxindoles in good yields and enantioselectivities.
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The diene-transmissive hetero-Diels-Alder reaction of 2-vinyl [small alpha],[small beta]-unsaturated aldimines: stereoselective synthesis of hexahydroquinazolin-2-ones

2 June, 2014 - 22:54

Org. Biomol. Chem., 2014, 12,4061-4064
DOI: 10.1039/C4OB00224E, CommunicationSatoru Kobayashi, Kenji Kudo, Ai Ito, Satoru Hirama, Takashi Otani, Takao Saito
The tandem Diels-Alder methodology of cross-conjugated 1-azatrienes for synthesis of crossed bis-cycloadducts with high chemo-, regio- and stereoselectivities is described.
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Improved hemicryptophane hosts for the stereoselective recognition of glucopyranosides

2 June, 2014 - 22:54

Org. Biomol. Chem., 2014, 12,4211-4217
DOI: 10.1039/C4OB00156G, PaperAline Schmitt, Olivier Perraud, Elina Payet, Bastien Chatelet, Benjamin Bousquet, Marion Valls, Daniele Padula, Lorenzo Di Bari, Jean-Pierre Dutasta, Alexandre Martinez
Slight changes in the chiral environment of enantiopure hemicryptophanes improve the stereoselective recognition of [small alpha] and [small beta] anomers of glucopyranosides.
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Gold-catalyzed tandem Diels-Alder reactions of enynals/enynones with alkenes: generation and trapping of cyclic o-QDMs

2 June, 2014 - 22:54

Org. Biomol. Chem., 2014, 12,4104-4111
DOI: 10.1039/C4OB00321G, PaperShifa Zhu, Lang Hu, Huanfeng Jiang
Gold-catalyzed generation of the highly reactive cyclic o-QDM species and application in preparation of structurally unique propeller-like molecules.
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