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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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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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Eric S. Schmidtmann Dipl.‐Chem. Martin Oestreich Prof. Dr. 《Angewandte Chemie (International ed. in English)》2009,48(25):4634-4638
Once difficult to obtain , the title compounds can be prepared in virtually enantiomerically pure form with a bis(triorganostannyl) zinc reagent (see scheme). Subsequent diastereoselective thermal (left) and Lewis acid promoted reactions (right) illustrate the synthetic potential of these compounds.
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Daniel J. Welsh Simon P. Jones Dr. David K. Smith Prof. 《Angewandte Chemie (International ed. in English)》2009,48(22):4047-4051
Now you bind it—now you don't! Chemical degradation of a dendritic scaffold allows multivalent interactions with DNA to be “switched off” as the multivalent array of ligands breaks down into smaller fragments, offering an approach by which a molecule can be temporarily endowed with high affinity for a biological target—an important concept in the development of new synthetic systems to intervene in biological pathways.
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Pier Giorgio Cozzi Prof. Dr. Fides Benfatti Dr. Luca Zoli Dr. 《Angewandte Chemie (International ed. in English)》2009,48(7):1313-1316
Work‐alcoholic! The elusive enantioselective catalytic α‐alkylation of aldehydes, a widely sought transformation, was brought to execution by the use of alcohols capable of forming stabilized carbocations (see scheme, TFA=trifluoroacetic acid).
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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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Jung Hee Yoon Dae Won Ryu Hyoung Chan Kim Dr. Sung Won Yoon Byoung Jin Suh Prof. Chang Seop Hong Prof. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(15):3661-3665
Two‐step magnetic transitions : An azide‐bridged 1D MnIII coordination polymer with a unique single end‐on mode was prepared; it displayed atypical antiferromagnetic couplings and field‐induced two‐step magnetic transitions (see figure). The spin‐canted phenomenon in the antiferromagnetic chain complex plays a pivotal role in establishing the slow magnetic relaxation.
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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.