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文章名     作者     期刊名     摘要     卷     期         如果没有找到您所需要的文献，请点击 ——此处申请     共57条记录   Efficient Synthesis of Substituted Dihydrotetraazapentacenes. [作者：Seillan, Claire;Brisset, Hugues;Siri, Olivier;,期刊：Organic Letters, 页码：4013-4016 , 文章类型： 研究论文，,卷期：2008年10-18] A versatile and very efficient synthesis of previously unknown were described. A structural study by NMR spectroscopy showed that the conjugated p-system of the pentacyclic skeleton rearranges depending on the electroni... Enantioselective Synthesis Utilizing Enantiomorphous Organic Crystal of Achiral Benzils as a Source of Chirality in Asymmetric Autocatalysis. [作者：Kawasaki, Tsuneomi;Harada, Yuuki;Suzuki, Kenta;Tobita, Takayuki;Florini, Nicola;Palyi, Gyula;Soai, Kenso;,期刊：Organic Letters, 页码：4085-4088 , 文章类型： 研究论文，,卷期：2008年10-18] Chiral crystals of achiral benzils act as efficient chiral initiators of asym. autocatalysis to afford highly enantioenriched pyrimidyl alkanols whose abs. configurations depend upon the enantiomorph of the crystal used ... Synthesis of a Novel Tricyclic Peptidomimetic Scaffold. [作者：Sellstedt, Magnus;Almqvist, Fredrik;,期刊：Organic Letters, 页码：4005-4007 , 文章类型： 研究论文，,卷期：2008年10-18] Nonracemic oxopyrazolopyridothiazolecarboxylates I (R = Ph, cyclopropyl; R1 = H, Br, Me2CHCH2, Ph, 4-MeOC6H4, 3-O2NC6H4, 3-furanyl, 2-MeC6H4, 1-naphthyl; R2 = H, Me) are prepd. as peptidomimetic scaffolds from nonracemic... Stereochemistry of the Singlet Oxygenation of Simple Alkenes: A Stereospecific Transformation. [作者：Alberti, Mariza N.;Vassilikogiannakis, Georgios;Orfanopoulos, Michael;,期刊：Organic Letters, 页码：3997-4000 , 文章类型： 研究论文，,卷期：2008年10-18] oxygen (1O2), using the optically active alkene (S,S)-cis-1,4-diphenyl-2-butene-1,4-d2, in MeOH and aprotic solvents was investigated. Our findings indicate that the title reaction is a highly stereospecific suprafacial... Cyclization via Carbolithiation of a-Amino Alkyllithium Reagents. [作者：Bahde, Robert J.;Rychnovsky, Scott D.;,期刊：Organic Letters, 页码：4017-4020 , 文章类型： 研究论文，,卷期：2008年10-18] We report a new route to tertiary a-amino stereocenters by sequential alkylation of a-amino nitriles followed by reductive lithiation of the nitrile and cyclization onto an alkene. Reductive lithiation of a-amino nitril... Design of a Highly Efficient and Water-Tolerant Sulfonic Acid Nanoreactor Based on Tunable Ordered Porous Silica for the von Pechmann Reaction. [作者：Karimi, Babak;Zareyee, Daryoush;,期刊：Organic Letters, 页码：3989-3992 , 文章类型： 研究论文，,卷期：2008年10-18] Among a no. of different sulfonic acid nanoreactors prepd., 5 having both acidic sites and Ph groups located inside the meso-channels of SBA-15 was shown to be the most active and reusable catalyst in the von Pechmann re... The Coupling of Isonitriles and Carboxylic Acids Occurring By Sequential Concerted Rearrangement Mechanisms. [作者：Jones, Gavin O.;Li, Xuechen;Hayden, Amy E.;Houk, K. N.;Danishefsky, Samuel J.;,期刊：Organic Letters, 页码：4093-4096 , 文章类型： 研究论文，,卷期：2008年10-18] Mechanisms for the recently described reactions of isonitriles with carboxylic acids (Li, X.; Danishefsky, S. J. J. Am. Chem. Soc.2008, 130, 5446) are explored with the B3LYP d. functional method. The mechanism involves... Highly Practical Catalytic Asymmetric 1,4-Addition of Arylboronic Acids in Water Using New Hydrophilic Chiral Bicyclo[3.3.0] Diene Ligands. [作者：Feng, Chen-Guo;Wang, Zhi-Qian;Shao, Cheng;Xu, Ming-Hua;Lin, Guo-Qiang;,期刊：Organic Letters, 页码：4101-4104 , 文章类型： 研究论文，,卷期：2008年10-18] The first Rh-diene-catalyzed aq. asym. 1,4-addn. of a,b-unsatd. carbonyl compds. with arylboronic acids has been realized. Using hydrophilic bicyclo[3.3.0] diene ligand I, the reactions can be performed successfully in ... Activation Parameters for Additions of Ambiphilic Methoxychlorocarbene to Alkenes. [作者：Moss, Robert A.;Zhang, Min;,期刊：Organic Letters, 页码：4045-4048 , 文章类型： 研究论文，,卷期：2008年10-18] Activation parameters are detd. for the addns. of methoxychlorocarbene (MeOCCl) to four alkenes, including tetramethylethylene (TME). MeOCCl is the first carbene to exhibit appreciable activation energy in addn. to TME ...