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Omrane Fadhel Dr. Dénes Szieberth Dr. Valérie Deborde Christophe Lescop Dr. László Nyulászi Prof. Muriel Hissler Prof. Régis Réau Prof. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(19):4914-4924
PS, I love you! Novel mixed phosphole/thiophene π‐conjugated systems were synthesized and their electronic properties have been studied both experimentally by UV/Vis spectroscopy and electrochemistry and by theoretical calculations. Exploiting the chemistry of both P‐ and S‐heteroles allows the generation of a diverse range of novel ring‐fused benzophosphole–thiophene derivatives.
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Zhiyong Jiang Dr. Yuanyong Yang Yuanhang Pan Yujun Zhao Hongjun Liu Choon‐Hong Tan Prof. Dr. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(19):4925-4930
Constructing α‐stereogenic amides and ketones : The highly regioselective and enantioselective conjugate addition of 1,3‐dicarbonyl compounds to 1,4‐dicarbonyl but‐2‐enes has been developed with the chiral bicyclic guanidine as catalyst (ee values up to 97 %; see scheme).
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Michiko Sasaki Dr. Hidaka Ikemoto Masatoshi Kawahata Dr. Kentaro Yamaguchi Prof. Kei Takeda Prof. Dr. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(18):4663-4666
Don't get trapped : The effect of conjugating electron‐withdrawing groups and α‐anion‐stabilizing heteroatom substituents on configurational stability of chiral carbanions through a double bond was examined on the basis of extent of chirality transfer in intramolecular trapping in [2,3]‐Wittig rearrangement of chiral 3‐substituted 1‐propenyloxy‐1‐phenyl‐2‐propen‐1‐yl carbanions (see scheme).
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Kenneth Hoi‐Yiu Chan Dr. Jacky Wing‐Yip Lam Dr. Keith Man‐Chung Wong Dr. Ben‐Zhong Tang Prof. Dr. Vivian Wing‐Wah Yam Prof. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(10):2328-2334
The aggregation and self‐assembly of square‐planar alkynylplatinum(II) complexes is induced by the use of a chiral polyacetylene with a helical conformation (see scheme). The chain helicity of the chiral polyacetylene under basic conditions has also been demonstrated to be enhanced by the presence of the positively charged platinum(II) complexes.
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Jinping Chen Dr. Masatoshi Mizumura Hiroshi Shinokubo Prof. Dr. Atsuhiro Osuka Prof. Dr. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(24):5942-5949
Two series of BODIPY dyes with substituents either in the α positions or in the β positions and different conjugation lengths were synthesized by means of iridium‐catalyzed borylation and rhodium‐catalyzed Heck‐type addition (see scheme). The α‐ and β‐substituted series show completely different photophysical properties. BODIPY=boron dipyrrin.
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Ludovic Drouin Dr. E. Cristina Stanca‐Kaposta Dr. Priptal Saundh Antony J. Fairbanks Dr. Sebastian Kemper Timothy D. W. Claridge Dr. John P. Simons Prof. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(16):4057-4069
The effect of carbon is subtle but sweet : The flexible C‐linkage in the newly synthesised C‐glycosyl mimetic, Manα(1,6)‐C‐ManαOPh allows OH? π bonding, both in the gas phase and in aqueous solution. This interaction is absent in the O‐linked disaccharide (see figure).
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Joakim Andréasson Prof. Dr. Stephen D. Straight Dr. Thomas A. Moore Prof. Dr. Ana L. Moore Prof. Dr. Devens Gust Prof. Dr. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(16):3936-3939
Off and on : A molecular triad, consisting of a porphyrin linked to two different, independently addressable photochromic moieties, functions as a molecular keypad lock with all‐photonic inputs and output. The porphyrin correlates the responses of the two inputs to light of different wavelengths and provides an appropriate output as fluorescence, which results only when one of eight possible input combinations has been applied (see figure).
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Koji Fukamizu Yoshihiro Miyake Dr. Yoshiaki Nishibayashi Prof. Dr. 《Angewandte Chemie (International ed. in English)》2009,48(14):2534-2537
Another way to dienes : The ruthenium‐catalyzed 6‐endo‐cycloisomerization of 1,5‐enynes gives the corresponding 1,3‐cyclohexadienes in high to excellent yields. This novel synthetic and catalytic method constitutes another way to selectively prepare 1,3‐cyclohexadienes, this cyclic diene skeleton being a core subunit in many natural products and a useful building block for a variety of organic transformations.
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Hai‐Hua Lu Hui Liu Dr. Wei Wu Xu‐Fan Wang Liang‐Qiu Lu Wen‐Jing Xiao Prof. Dr. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(12):2742-2746
Economical approach : The first organocatalytic asymmetric intramolecular hydroarylation of phenol‐ and aniline‐derived enals offers one of the most straightforward and atom‐economic approaches to enantioriched chromans and tetrahydroquinolines (up to 96 % ee; see scheme).
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Fa‐Chen Chi Dr. Suvarn S. Kulkarni Prof. Dr. Medel Manuel L. Zulueta Shang‐Cheng Hung Prof. Dr. 《化学:亚洲杂志》2009,4(3):386-390
Making ends meet : The L ‐gulopyranosyl trichloroacetimidate and 1,6‐anhydro‐2,3‐di‐O‐benzyl‐β‐L ‐gulopyranose, efficiently derived from L ‐ascorbic acid, were individually used as a starting unit and an elongation unit to prepare L ‐guluronic acid linked alginate oligosaccharides in excellent α selectivity and in good yields.
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Lei Gong Dr. Zhening Chen Yumei Lin Xumin He Prof. Dr. Ting Bin Wen Prof. Dr. Xin Xu Prof. Dr. Haiping Xia Prof. Dr. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(25):6258-6266
Osmabenzenes can be easily synthesized from two η2‐coordinated olefin osmacycles in the presence of benzonitrile by means of facile hydrogen‐transfer conversions (see graphic). Mechanisms for the formation of osmabenzenes are proposed based on DFT calculations.
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Romas Kudirka Sean K. J. Devine Christopher S. Adams David L. Van Vranken Prof. 《Angewandte Chemie (International ed. in English)》2009,48(20):3677-3680
As easy as 1, 2, 3 : A palladium‐catalyzed three‐component coupling generates α,β‐unsaturated γ‐amino acids in a single step (see scheme). The reaction is believed to involve migration of a vinyl substituent to a highly electrophilic palladium carbene. Unlike previous synthetic approaches, this synthesis provides access to γ‐amino acids with non‐natural side chains.
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Helle Svendsen Jacob Overgaard Dr. Marie Chevallier Eric Collet Prof. Bo B. Iversen Prof. Dr. 《Angewandte Chemie (International ed. in English)》2009,48(15):2780-2783
X‐ray vision : Single‐crystal XRD experiments (see picture) reveal the excited‐state structure of the photomagnetic heterobimetallic title complex. The system shows a decrease in all the iron–ligand bond lengths, suggesting that photoexcitation involves a ligand‐to‐metal charge transfer or a change in the superexchange coupling between the metal centers.
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Takuya Hashimoto Dr. Kazuki Sakata Keiji Maruoka Prof. Dr. 《Angewandte Chemie (International ed. in English)》2009,48(27):5014-5017
Going through the phases : The title reaction was found to proceed by an initial base‐mediated isomerization to allenyl esters and subsequent phase transfer catalyzed alkylation at the α position of the ester (see scheme).
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Long Yi Heyang Li Lu Sun Liangliang Liu Caihong Zhang Zhen Xi Prof. Dr. 《Angewandte Chemie (International ed. in English)》2009,48(22):4034-4037
Fast detection of cellular thiols in aqueous medium was achieved using a newly developed fluorescence probe (see picture). Based on this probe, a high‐throughput fluorescence assay for glutathione reductase was developed.