共查询到20条相似文献,搜索用时 31 毫秒
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Zhaobin Han Zheng Wang Dr. Xumu Zhang Prof. Dr. Kuiling Ding Prof. Dr. 《Angewandte Chemie (International ed. in English)》2009,48(29):5345-5349
From imines to amines through catalysis by IrI complexes of a new type of P,N ligand (see scheme): This reaction affords the corresponding optically active amines with up to 98 % ee and has also been used with perfect stereoselectivity in the asymmetric synthesis of sertraline ( 1 ), an important antidepressant chiral drug.
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Kyung Jin Lee Sa Hoon Min Jyongsik Jang Prof. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(11):2491-2495
Control yourself! The mesoporous silica nanofibers (MSNFs) from dual structure‐directing agents were fabricated inside the pores of porous alumina (AAO, see figure) by using vapor phase synthesis. The pore structures could be controlled to form a range of structures from mesocellular foams to cylindrical mesopores with long‐range order by adding cationic cosurfactants.
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Masato Ito Prof. Dr. Lee Wei Koo Akio Himizu Chika Kobayashi Ayaka Sakaguchi Takao Ikariya Prof. Dr. 《Angewandte Chemie (International ed. in English)》2009,48(7):1324-1327
Awakening of the Cp one : The bifunctional complex 1 facilitates the interaction with substrates bearing less electrophilic carbon atoms than ketones, epoxides, and imides. The title reaction was applicable to the reduction of Evans' asymmetric alkylation products to the chiral alcohols along with good recovery of the chiral oxazolidinone auxiliary. EWG=electron‐withdrawing group.
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Merle Arrowsmith Michael S. Hill Dr. Dugald J. MacDougall Dr. Mary F. Mahon Dr. 《Angewandte Chemie (International ed. in English)》2009,48(22):4013-4016
High‐de‐hydride! A straightforward reaction between a magnesium silylamido/N‐heterocyclic carbene adduct and phenylsilane provides a {Mg4H6} cluster molecule that may be regarded as a combination of two magnesium dihydride and two magnesium monohydride moieties.
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Vellaisamy Sridharan Pandi Dhanalakshmi Shanmugam Muthusubramanian 《Journal of heterocyclic chemistry》2007,44(2):491-493
A one‐pot synthesis of some new 2,8‐disubstituted 3H‐phenoxazin‐3‐ones from 4‐substituted‐2‐aminophenols through a selective oxidative condensation by lead tetraacetate in acetic acid is described. 相似文献
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Hui Shao Jon R. Parquette Prof. 《Angewandte Chemie (International ed. in English)》2009,48(14):2525-2528
Roll up : A peptide–dendron hybrid (PDH) is capable of self‐assembling into either a soluble nanotube or an amyloid‐like fibrillar network. The structures interconvert on adjusting the salt concentration or pH value. Their hydrophobic interfaces efficiently encapsulate hydrophobic molecules in water which can then be released by lowering the pH value.
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Mitsuru Miyasaka Azusa Fukushima Tetsuya Satoh Prof. Dr. Koji Hirano Dr. Masahiro Miura Prof. Dr. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(15):3674-3677
Simple and brilliant : 1‐Substituted 1H‐indole‐2‐carboxylic acids efficiently undergo successive diarylation accompanied by C? H bond cleavage and decarboxylation upon treatment with aryl bromides in the presence of a palladium catalyst system to afford fluorescent 2,3‐diarylindoles. This facile synthetic method provides a highly efficient blue emitter with a quantum yield of 0.97 in the solid state (see scheme).
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Xue‐Yi Chen Charles Barnes Dr. Jerry R. Dias Prof. T. C. Sandreczki Prof. 《Chemistry (Weinheim an der Bergstrasse, Germany)》2009,15(9):2041-2044
Triethylamine hydroiodide crystals were formed during Sonogashira reactions; after complete reaction the solution retains a characteristic light color (see picture). Very sluggish Sonogashira reactions of electron‐enriched aryl diiodides have been carried out in high yield in an oxygen‐free, two‐chamber reaction system. The formation of triethylamine hydroiodide crystals was monitored to determine the completion of reaction.
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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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Thorben Hamann Esther Böhler Petra Swiderek Prof. Dr. 《Angewandte Chemie (International ed. in English)》2009,48(25):4643-4645
The smallest catalyst : A new strategy to control chemical synthesis by exposure to low‐energy electrons relies on the electrostatic attraction caused by the soft ionization of one of the reaction partners. This approach was used to induce a reaction between C2H4 and NH3 yielding aminoethane. The reaction resembles a hydroamination except that the electron beam replaces the catalyst used in the organic synthesis.