共查询到20条相似文献,搜索用时 19 毫秒
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Yoshihiro Matano Prof. Dr. Makoto Nakashima Hiroshi Imahori Prof. Dr. 《Angewandte Chemie (International ed. in English)》2009,48(22):4002-4005
Mind the (narrow) gap : α‐Ethynylphospholes generated in situ from the corresponding silyl‐capped precursors were converted into a series of α‐(arylethynyl) phospholes bearing functional substituents as well as an α,α′‐linked terphosphole (see scheme). The terphosphole has a narrow HOMO–LUMO gap owing to efficient π conjugation over the three phosphole rings.
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Jörg Stierstorfer Dr. Karina R. Tarantik Dipl.‐Chem. Thomas M. Klapötke Prof. Dr. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(23):5775-5792
A new way to make a bang : Several functionalized 1‐ethyl‐5‐aminotetrazoles, 1‐ethyl‐5‐nitrimino‐tetrazoles, and copper complexes have been synthesized and their chemical and energetic properties have been comprehensively characterized. The compounds belong to all classes of “energetic materials”: explosives, propellants, and pyrotechnics.
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Ji‐Ho Yoon Prof. Yun‐Je Lee Jeasung Park Dr. Taro Kawamura Dr. Yoshitaka Yamamoto Dr. Takeshi Komai Dr. Satoshi Takeya Dr. Sang Sup Han Dr. Jong‐Won Lee Prof. Yongjae Lee Prof. 《Chemphyschem》2009,10(2):352-355
Easy come, easy go: Hydroquinone forms a channel structure of cages with hydrogen‐bonded hexagons. These may provide an ideal route for the fast inclusion and facile release of hydrogen molecules (see figure), which can lead to reversible hydrogen storage under mild conditions.
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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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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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Toshimichi Ohmura Dr. Yuta Takasaki Hideki Furukawa Michinori Suginome Prof. Dr. 《Angewandte Chemie (International ed. in English)》2009,48(13):2372-2375
Changing places : Intramolecular B(pin)/H exchange took place in the presence of a platinum–phosphane catalyst, giving synthetically useful cis‐β‐methyl‐substituted alkenylboronates stereoselectively (see scheme; B(pin)=4,4,5,5‐tetramethyl‐1,3,2‐dioxaborolan‐2‐yl).
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Jie Han Dr. Xiao‐Yong Chang Li‐Rong Zhu Mei‐Li Pang Dr. Ji‐Ben Meng Prof. Stephen Sin‐Yin Chui Dr. Siu‐Wai Lai Dr. V. A. L. Roy Dr. 《化学:亚洲杂志》2009,4(7):1099-1107
Chain change : Variations in the position, number, and chain length of the n‐alkoxy chains readily tune the liquid‐crystalline properties of 2,5‐diaryl‐1,3,4‐thiadiazole derivatives from smectic to hexagonal columnar mesophases at room temperature. The calamitic S‐heterocyclic compounds show electrical conductivity in both solid and liquid‐crystal states.
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Juan C. Rodríguez‐Domínguez Alexander Balbuzano‐Deus Miguel A. López‐López Juan C. Rodríguez‐Domínguez Gilbert Kirsch 《Journal of heterocyclic chemistry》2007,44(1):273-275
An efficient two steps procedure for the synthesis of 1‐acetyl‐1H‐indol‐3‐yl acetates, starting from 2‐chlorobenzoic acids, was developed and in general, moderate to good yields were obtained 相似文献
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Tony K. M. Shing Prof. Dr. Wai F. Wong Dr. Taketo Ikeno Prof. Dr. Tohru Yamada Prof. Dr. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(11):2693-2707
From sugar to cycloadduct : The effect of the trans‐acetonide blocking group and the stereochemistry of the substituents on the regio‐ and stereoselectivity in the intramolecular nitrone–alkene cycloaddition (INAC) reaction of hept‐6‐enoses (see scheme) is reported and studied by using theoretical analysis.
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Soo Min Kim Ji Hoon Park Youn Kyung Kang Young Keun Chung Prof. 《Angewandte Chemie (International ed. in English)》2009,48(25):4532-4535
Tying up loose ends : The reaction of bisallenes tethered with N‐(p‐tolylsulfonamide) in the presence of a cationic gold N‐heterocyclic carbene catalyst gave new cycloisomerization products, 6,7‐dimethyleneazabicyclo[3.1.1]heptanes, in high yields (see scheme; IPr=N,N′‐bis(2,6‐diisopropylphenyl)imidazol‐2‐ylidene).
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Alexis Coste Ganesan Karthikeyan Dr. François Couty Prof. Gwilherm Evano Dr. 《Angewandte Chemie (International ed. in English)》2009,48(24):4381-4385
Mild reaction conditions are the advantage of the title reaction, which allows straightforward entry to a variety of ynamides starting from readily available 1,1‐dibromo‐1‐alkenes, which act as attractive alkynylating agents (see scheme; EWG=electron‐withdrawing group, DMF=N,N‐dimethylformamide).
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Andrei V. Malkov Prof. Dr. Mikhail A. Kabeshov Maciej Barłog Pavel Kočovský Prof. Dr. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(7):1570-1573
Kinetic refinery : A practical, highly stereoselective, two‐step catalytic protocol for the α‐allylation of aldehydes, starting from crotyltrichlorosilanes, has been developed (see scheme). In each reaction step, one of the stereoisomers reacted faster than the other, which resulted in a kinetic stereochemical (E/Z) self‐refinement of the system and led to the formation of virtually enantiomerically and geometrically pure linear homoallylic alcohols in high yield.
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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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Peng Yang Dr. Anne De Cian Marie‐Paule Teulade‐Fichou Dr. Jean‐Louis Mergny Dr. David Monchaud Dr. 《Angewandte Chemie (International ed. in English)》2009,48(12):2188-2191
Lighting up : A G‐quadruplex‐specific fluorescent probe was designed combining the specificity of the pyridodicarboxamide motif for guanine quadruplexes and the fluorescence properties of thiazole orange. While the assembly of the two partners through a flexible linker leads to a nonselective probe, merging them in a single, rigid scaffold leads to a dye that elicits the properties required for G‐quadruplex sensing.
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Dehui Zhang Chengye Yuan Prof. Dr. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(16):4088-4101
β‐Amino acid analogues : The nucleophilic addition of ethyl (diethoxyethyl)methylphosphinate to a variety of (S)‐(tert‐butanesulfinyl)imines leads to the isolation of two enantioenriched β‐aminophosphinates (>95 % ee; see scheme). Subsequent removal of the protecting groups through pivotal metal‐catalyzed thiophenolysis leads to optically pure ethyl β‐amino‐H‐phosphinates.