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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84条记录   An Unexpected Oxidation of Unactivated Methylene C-H Using DIB/TBHP Protocol [作者：ZHAO YI; YIM WAILEUNG; TAN CHONG KIAT; YEUNG YINGYEUNG,期刊：Organic Letters, 页码：4308-4311 , 文章类型： Article，,卷期：2011年13-16] An in situ generated hypervalent iodine species, bis(tert-butylperoxy)iodobenzene, was used as a peroxy radical source for the oxidation of unreactive, remote, and isolated alkyl (cyclic or aliphatic) esters and amides t... Three-Component Reaction of N '-(2-Alkynylbenzylidene)hydrazide, Alkyne, with Sulfonyl Azide via a Multicatalytic Process: A Novel and Concise Approach to 2-Amino-H-pyrazolo[5,1-a]isoquinolines [作者：LI SHAOYU; LUO YONG; WU JIE,期刊：Organic Letters, 页码：4312-4315 , 文章类型： Article，,卷期：2011年13-16] A novel and efficient route for the synthesis of 2-amino-H-pyrazolo[5,1-a]isoquinolines via a three-component reaction of N'-(2-alkynylbenzylidene)hydrazide, alkyne, and sulfonyl azide is described. This transformation, ... Sequential Rhodium-, Silver-, and Gold-Catalyzed Synthesis of Fused Dihydrofurans [作者：WANG HENGBIN; DENTON JUSTIN R; DAVIEST HUW M L,期刊：Organic Letters, 页码：4316-4319 , 文章类型： Article，,卷期：2011年13-16] A triple cascade process was developed for the rapid synthesis of polycyclic benzo-fused dihydrofurans. The first step is a rhodium-catalyzed cyclopropanation of alpha-aryldiazoketones with alkenes. This is followed by a... A Molecular Balance for Measuring Aliphatic CH-pi Interactions [作者：CARROLL WILLIAM R; ZHAO CHEN; SMITH MARK D; PELLECHIA PERRY J; SHIMIZU KEN D,期刊：Organic Letters, 页码：4320-4323 , 文章类型： Article，,卷期：2011年13-16] A series of conformationally flexible bicyclic N-arylimides were employed as molecular balances to study the weak aliphatic CH-pi Interaction between alkyl and arene groups. The formation of intramolecular CH-pi interact... Iodonium Salts Are Key Intermediates in Pd-Catalyzed Acetoxylation of Pyrroles [作者：LUBRIKS DMITRIJS; SOKOLOVS IGORS; SUNA EDGARS,期刊：Organic Letters, 页码：4324-4327 , 文章类型： Article，,卷期：2011年13-16] A mild, room-temperature Pd-catalyzed acetoxylation of pyrroles with phenyliodonium acetate Is described. The acetoxylation was found to proceed via the initial formation of pyrrolyl(phenyl)iodonium acetates, which were ... Cu(II)-Catalyzed Olefin Migration and Prins Cyclization: Highly Diastereoselective Synthesis of Substituted Tetrahydropyrans [作者：GHOSH ARUN K; NICPONSKI DANIEL R,期刊：Organic Letters, 页码：4328-4331 , 文章类型： Article，,卷期：2011年13-16] Metal ligand complexes of Cu(OTf)(2) with an appropriate bisphosphine ligand have been shown to effectively catalyze the formation of substituted tetrahydropyrans via a sequential olefin migration and Prins-type cyclizat... Reverse the Diastereoselectivity of the Rh(I)-Catalyzed Pauson-Khand Cycloaddition [作者：TURLINGTON MARK; PU LIN,期刊：Organic Letters, 页码：4332-4335 , 文章类型： Article，,卷期：2011年13-16] It is discovered that the diastereoselectivity of the Rh(I)-catalyzed Pauson-Khand cycloaddition of chiral enynes can be reversed to generate the trans diastereomer as the major product In the absence of a chelate phosph... Three-Component Synthesis of Neoglycopeptides Using a Cu(II)-Triggered Aminolysis of Peptide Hydrazide Resin and an Azide-Alkyne Cycloaddition Sequence [作者：EBRAN JEANPHILIPPE; DENDANE NABIL; MELNYK OLEG,期刊：Organic Letters, 页码：4336-4339 , 文章类型： Article，,卷期：2011年13-16] Copper(II)-induced oxidative aminolysis of hydrazides generates Cu(I), the catalyst of the azide-alkyne cycloaddition. This feature was exploited to design a novel solid phase detaching three-component reaction permittin... Highly Efficient Synthesis of Phenols by Copper-Catalyzed Hydroxylation of Aryl Iodides, Bromides, and Chlorides [作者：YANG KAI; LI ZHENG; WANG ZHAOYANG; YAO ZHIYI; JIANG SHENG,期刊：Organic Letters, 页码：4340-4343 , 文章类型： Article，,卷期：2011年13-16] 8-Hydroxyquinolin-N-oxide was found to be a very efficient ligand for the copper-catalyzed hydroxylation of aryl iodides, aryl bromides, or aryl chlorides under mild reaction conditions. This methodology provides a direc... Total Synthesis of A Novel Tetracyclic Alkaloid, Cassiarin F from the Flowers of Cassia siamea [作者：DEGUCHI JUN; HIRAHARA TOMOE; OSHIMI SHIORI; HIRASAWA YUSUKE; EKASARI WIWIED; SHIROTA OSAMU; HONDA TOSHIO; MORITA HIROSHI,期刊：Organic Letters, 页码：4344-4347 , 文章类型： Article，,卷期：2011年13-16] A novel alkaloid, cassiarin F (1), which showed potent antiplasmodial activity against Plasmodium falciparum In vitro, was isolated from the flowers of Cassia siamea, and Its structure was elucidated on the basis of 2D N... Highly Effective Asymmetric Hydrogenation of Cyclic N-Alkyl Imines with Chiral Cationic Ru-MsDPEN Catalysts [作者：CHEN FEI; DING ZIYUAN; QIN JIE; WANG TIANLI; HE YANMEI; FAN QINGHUA,期刊：Organic Letters, 页码：4348-4351 , 文章类型： Article，,卷期：2011年13-16] A range of cyclic N-alkyl imines were efficiently hydrogenated by using a chiral cationic Ru(eta(6)-cymene)(MsDPEN)(BArF) complex (MsDPEN = N-(methanesulfonyl)-1,2-diphenylethylenediamine) In high yields and up to 98% ee... Synthesis of the Pyridine Core of Cyclothiazomycin [作者：ZOU YAN; LIU QINGYANG; DEITERS ALEXANDER,期刊：Organic Letters, 页码：4352-4355 , 文章类型： Article，,卷期：2011年13-16] A highly convergent synthesis of the pyridine core of the thiopeptide antibiotic cyclothiazomycin has been developed based on a [2 + 2 + 2] cyclotrimerization key step. The regioselective assembly of the heterocyclic cen... Photoresponsive Formation of Pseudo[2]rotaxane with Cyclodextrin Derivatives [作者：WANG ZHIBIN; TAKASHIMA YOSHINORI; YAMAGUCHI HIROYASU; HARADA AKIRA,期刊：Organic Letters, 页码：4356-4359 , 文章类型： Article，,卷期：2011年13-16] The two isomers of 6-stilbene-amide-alpha-CD (6-StiNH-alpha-CD) exhibit different inclusion behaviors upon complexation with an alkyl chain bearing pyridinium end caps. Photoisomerization of the stilbene moiety of the CD... Mannopyranosyl Uronic Acid Donor Reactivity [作者：WALVOORT MARTHE T C; DE WITTE WILBERT; VAN DIJK JESSE; DINKELAAR JASPER; LODDER GERRIT; OVERKLEEFT HERMAN S; CODEE JEROEN D C; VAN DER MAREL GIJSBERT A,期刊：Organic Letters, 页码：4360-4363 , 文章类型： Article，,卷期：2011年13-16] The reactivity of a variety of mannopyranosyl uronic acid donors was assessed In a set of competition experiments, in which two (S)-tolyl mannosyl donors were made to compete for a limited amount of promoter (NIS/TfOH). ... Maleimide-Dimethylfuran exo Adducts: Effective Maleimide Protection in the Synthesis of Oligonucleotide Conjugates [作者：SANCHEZ ALBERT; PEDROSO ENRIQUE; GRANDAS ANNA,期刊：Organic Letters, 页码：4364-4367 , 文章类型： Article，,卷期：2011年13-16] The reaction of maleimide-containing compounds with 2,5-dimethylfuran gives a mixture of exo and endo isomers from which the exo cycloadduct can be easily isolated taking advantage of its stability In concentrated aqueou... Catalytic Enantioselective Total Synthesis of (+)-Torrubiellone C [作者：JESSEN HENNING J; SCHUMACHER ANDREAS; SCHMID FABIAN; PFALTZ ANDREAS; GADEMANN KARL,期刊：Organic Letters, 页码：4368-4370 , 文章类型： Article，,卷期：2011年13-16] Silyl-protected (R)-methyl 2-(hydroxymethyl)butanoate was obtained by an enantioselective Ir-catalyzed hydrogenation In high yield and selectivity. Elaboration of this building block via Takai and Stille reactions gave a...