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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28条记录   Controlling Enantioselectivity in Additions to Cyclic Oxocarbenium Ions via Transition-Metal Catalysis [作者：WATSON MARY P; MAITY PRANTIK,期刊：SYNLETT, 页码：1705-1708 , 文章类型： Article，,卷期：2012年-12] Controlling enantioselectivity in additions to oxocarbenium ions remains a challenge in asymmetric catalysis. By using a catalytically generated chiral organometallic intermediate, a copper acetylide, we have developed a... Inter- and Intramolecular Carbon-Carbon Bond-Forming Radical Reactions [作者：MIYABE HIDETO,期刊：SYNLETT, 页码：1709-1724 , 文章类型： Article，,卷期：2012年-12] Free-radical-mediated reactions were studied as a powerful method for constructing the carbon-carbon bond. The intermolecular carbon radical addition to ketimines has not been widely studied. The screening of reactive ke... Aryne Insertion Reactions into Carbon-Carbon sigma-Bonds [作者：YOSHIDA HIROTO; TAKAKI KEN,期刊：SYNLETT, 页码：1725-1732 , 文章类型： Article，,卷期：2012年-12] Diverse nucleophilic carbon-electrophilic carbon sigma-bonds were found to undergo facile cleavage and to add across carbon-carbon triple bonds of arynes without the aid of transition-metal catalysts, leading to the dire... Construction and Function of Interpenetrated Molecules Based on the Positively Charged Axle Components [作者：ZHANG ZHIJUN; LIU YU,期刊：SYNLETT, 页码：1733-1750 , 文章类型： Article，,卷期：2012年-12] Interpenetrated molecules have attracted increasing attention from chemists not only because of their intriguing architectures and topologies, but also as a result of potential applications in molecular machinery and nan... Sensitive Thin-Layer Chromatography Detection of Boronic Acids Using Alizarin [作者：DUVAL FLORINE; VAN BEEK TERIS A; ZUILHOF HAN,期刊：SYNLETT, 页码：1751-1754 , 文章类型： Article，,卷期：2012年-12] A new method for the selective and sensitive detection of boronic acids on thin-layer chromatography plates is described. The plate is briefly dipped in an alizarin solution, allowed to dry in ambient air, and observed u... Regioselective, Catalyst-Free, One-Step Synthesis of ABCD-Fused Heterocyclic Ring System, Closely Related to Circumdatin Alkaloids [作者：YAQUB MUHAMMAD; PERVEEN RUQAYIA; SHAFIQ ZAHID; PERVEZ HUMAYUN; TAHIR MUHAMMAD NAWAZ,期刊：SYNLETT, 页码：1755-1758 , 文章类型： Article，,卷期：2012年-12] A novel method for the synthesis of tetracyclic fusedring heterocycles, closely related to circumdatin alkaloids, is developed via regioselective reaction of heterocyclic ketene aminals (HKA) with 3-formylchromones. Regiospecific Direct C-H Arylation at the 2-Position of L-Histidine Using Arylboronic Acids [作者：MAHINDRA AMIT; JAIN RAHUL,期刊：SYNLETT, 页码：1759-1764 , 文章类型： Article，,卷期：2012年-12] The first regiospecific direct C-2 arylation procedure for histidine using arylboronic acids has been developed. The reaction allows a one-step synthesis of a large variety of 2-aryl-L-histidines using ammonium persulfat... Diastereoselectivity in Diels-Alder Cycloadditions of Erythrose Benzylideneacetal 1,3-Butadienes with Maleimides [作者：SALGUEIRO DANIELA A L; DUARTE VERA C M; SOUSA CRISTINA E A; ALVES MARIA J; FORTES ANTONIO GIL,期刊：SYNLETT, 页码：1765-1768 , 文章类型： Article，,卷期：2012年-12] Maleimides were combined with D-erythrose benzylidene-acetal 1,3-butadienes to study the facial selectivity of the Diels-Alder cycloadditions. The selectivity was found to range from moderate to good. The reaction diaste... Lateral Lithiation-Initiated Annulations in the Synthesis of 1-Oxygenated Carbazole Alkaloids and a Cycloheptacarbazole [作者：JANA AMIT KUMAR; PAHARI PALLAB; MAL DIPAKRANJAN,期刊：SYNLETT, 页码：1769-1774 , 文章类型： Article，,卷期：2012年-12] Anionic [4+2] annulation of lithiated furoindolones with dimethyl maleate followed by selective demethoxycarbonylation provides an efficient synthetic route to 3-methoxycarbonylcarbazoles. The route has led to the straig... TBAHS-Catalyzed Synthesis of 2-Dihydroquinazolin-2-ylquinoline: An Efficient and Practical Synthesis of Naturally Occurring Alkaloids Luotonin A, B, and E [作者：NAGARAPU LINGAIAH; GAIKWAD HANMANT K; BANTU RAJASHAKER,期刊：SYNLETT, 页码：1775-1778 , 文章类型： Article，,卷期：2012年-12] A synthesis of 2-dihydroquinazolin-2-ylquinoline using a phase-transfer catalyst (TBAHS) in semi-aqueous phase, followed by Mitsunobu cyclization as key steps for an efficient and practical synthesis of naturally occurri... An Optimised Synthesis of 2-[2,3-Bis(tert-butoxycarbonyl)guanidino]ethylamine [作者：HICKEY SHANE M; ASHTON TRENT D; KHOSA SIMREN K; PFEFFER FREDERICK M,期刊：SYNLETT, 页码：1779-1782 , 文章类型： Article，,卷期：2012年-12] This short report describes an improved, reliable, and high-yielding (>90%) synthesis of 2-[2,3-bis(tert-butoxycarbonyl) guanidino] ethylamine. The method is scalable (>5 g), and the product obtained directly from the re... Catalytic Enantioselective Synthesis of Chiral Isatin Derivatives by an Aldol Approach [作者：YANAGISAWA AKIRA; KUSHIHARA NAOYUKI; SUGITA TAKUYA; YOSHIDA KAZUHIRO,期刊：SYNLETT, 页码：1783-1788 , 文章类型： Article，,卷期：2012年-12] A catalytic enantioselective aldol reaction of alkenyl esters with isatins was achieved using an (S)-BINOL-derived chiral tin dibromide possessing a 4-tert-butylphenyl group at 3- and 3'-positions as the chiral pre-catal... A Total Synthesis of Yellowish Aphid Pigment Furanaphin through Fries Rearrangement Assisted by Boron Trifluoride-Acetic Acid Complex [作者：NISHIMURA TAICHI; IWATA TAKEKI; MAEGAWA HIRONORI; NISHII TAKESHI; MATSUGASAKO MASAMI; KAKU HIROTO; HORIKAWA MITSUYO; INAI MAKOTO; TSUNODA TETSUTO,期刊：SYNLETT, 页码：1789-1792 , 文章类型： Article，,卷期：2012年-12] The yellowish aphid pigment furanaphin, isolated from Aphis spiraecola and possessing cytotoxicity against HL-60 (human promyelocytic leukemia-60) cells, was synthesized by utilizing the Fries rearrangement assisted with... Serendipitous Synthesis and Configurational Assignment of (-)-Gabosine J [作者：SHING TONY K M; CHEN Y; WU HO T,期刊：SYNLETT, 页码：1793-1796 , 文章类型： Article，,卷期：2012年-12] 2-epi-Gabosine I, unambiguously synthesized from benzyl D-mannopyranoside in nine steps with 34% overall yield, has been shown to be identical to gabosine J by NMR spectral analysis, thereby indicating that the relative ... Lewis Base Organocatalyzed Enantioselective Hydrosilylation of 1,4-Benzoxazines [作者：JIANG YAN; LIU LIXIN; YUAN WEICHENG; ZHANG XIAOMEI,期刊：SYNLETT, 页码：1797-1800 , 文章类型： Article，,卷期：2012年-12] A chiral Lewis base organocatalyzed enantioselective hydrosilylation of 1,4-benzoxazines is presented. The reactions afforded various enantioenriched 3-substituted dihydro-2H-1,4-benzoxazines with high yields (up to 98%)... The Oxidative Acylnitroso Hetero-Diels-Alder Reaction Catalyzed by Dirhodium Caprolactamate [作者：TUSUN XIAREPATI; LU CHONGDAO,期刊：SYNLETT, 页码：1801-1804 , 文章类型： Article，,卷期：2012年-12] An effective protocol is described for the generation and in situ Diels-Alder trapping of acylnitroso derivatives. In this procedure, the oxidation of hydroxamic acid is efficiently catalyzed by dirhodium(II) caprolactam...