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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99条记录   Highly Enantioslective Synthesis of Multisubstituted Polyfunctional Dihydropyrrole via an Organocatalytic Tandem Michael/Cyclization Sequence [作者：ZHANG GEN; ZHANG YAOHU; JIANG XIANXING; YAN WENJIN; WANG RUI,期刊：Organic Letters, 页码：3806-3809 , 文章类型： Article，,卷期：2011年13-15] A unique approach to asymmetric synthesis of various optically pure multisubstituted 2,3-dihydropyrroles catalyzed by a novel rosin-derived tertiary amine thiourea via a tandem Michael/cyclization sequence with high yiel... Catalytic Asymmetric Addition of Thiols to Nitrosoalkenes Leading to Chiral Non-Racemic alpha-Sulfenyl Ketones [作者：HATCHER JOHN M; KOHLER MARK C; COLTART DON M,期刊：Organic Letters, 页码：3810-3813 , 文章类型： Article，,卷期：2011年13-15] The first asymmetric organocatalytic sulfenylation of in situ derived nitrosoalkenes leading to chiral nonracemic alpha-sulfenylated ketones is described. The transformation proceeds in an umpolung fashion, relative to e... Catalytic Asymmetric Conjugate Allylation of Coumarins [作者：KUANG YULONG; LIU XIAOHUA; CHANG LU; WANG MIN; LIN LILI; FENG XIAOMING,期刊：Organic Letters, 页码：3814-3817 , 文章类型： Article，,卷期：2011年13-15] A catalytic asymmetric conjugate allylation was successfully developed to synthesize potential pharmacologically active 4-allyl-2-oxochroman skeletons. A dual activation strategy was employed by using N,N'-dioxide-Yb(OTf... Ligand Effects on Negishi Couplings of Alkenyl Halides [作者：KRASOVSKIY ARKADY; LIPSHUTZ BRUCE H,期刊：Organic Letters, 页码：3818-3821 , 文章类型： Article，,卷期：2011年13-15] Negishi couplings at olefinic centers do not always occur with the anticipated maintenance of stereochemistry. The source of erosion has been traced to the ligand, and a modified method has been developed that solves the... Highly Selective Reactions of Unbiased Alkenyl Halides and Alkylzinc Halides: Negishi-Plus Couplings [作者：KRASOVSKIY ARKADY; LIPSHUTZ BRUCE H,期刊：Organic Letters, 页码：3822-3825 , 文章类型： Article，,卷期：2011年13-15] High yielding stereo- and chemoselective Pd-catalyzed cross-couplings In THF at room temperature of alkenyl iodides and bromides with primary and secondary alkyl zinc iodides have been developed with the aid of N-methylm... Organocatalytic Asymmetric Strecker Reaction of Di- and Trifluoromethyl Ketoimines. Remarkable Fluorine Effect [作者：LIU YUNLIN; SHI TAODA; ZHOU FENG; ZHAO XIAOLI; WANG XIN; ZHOU JIAN,期刊：Organic Letters, 页码：3826-3829 , 文章类型： Article，,卷期：2011年13-15] A highly enantioselective Strecker reaction of difluoromethyl and trifluoromethyl ketoimines was developed. Remarkable fluorine effect on the reactivity and selectivity is observed and discussed. Synthesis of Enantiopure Substituted Piperidines via an Aziridinium Ring Expansion [作者：JARVIS SCOTT B D; CHARETTE ANDRE B,期刊：Organic Letters, 页码：3830-3833 , 文章类型： Article，,卷期：2011年13-15] Herein we report a novel methodology for the asymmetric synthesis of 3-substituted piperidines from readily available chiral building blocks. This method, which features a novel irreversible dihydropyrole-tetrahydropyrid... A Remarkable Multicomponent Cascade Sequence for the Formation of a Spirocyclic Polyether [作者：PARSONS PHILIP J; COOPER NOEL; RENSHAW MATTHEW; WALSH LEE; COLES MARTYN P,期刊：Organic Letters, 页码：3834-3836 , 文章类型： Article，,卷期：2011年13-15] A reaction of 2-hydroxy-2-methylbutan-3-one with sodium hydride in the presence or absence of ethyl formate after acid workup gave the spirocyclic ether 3. Methylenecyclopropanes in [4+1] Cycloaddition with Enones [作者：INAMI TASUKU; SAKO SAORI; KURAHASHI TAKUYA; MATSUBARA SEIJIRO,期刊：Organic Letters, 页码：3837-3839 , 文章类型： Article，,卷期：2011年13-15] A nickel-catalyzed [4 + 1] cycloaddition of enones with methylenecyclopropanes leading to dihydrofurans was developed. The reaction outcome is attributed to the transformation of methlenecyclopropane, which is incorporat... Planar Macrocyclic Fluoropentamers as Supramolecular Organogelators [作者：REN CHANGLIANG; XU SHENGYU; XU JUN; CHEN HONGYU; ZENG HUAQIANG,期刊：Organic Letters, 页码：3840-3843 , 文章类型： Article，,卷期：2011年13-15] Despite their great diversities, 2D-shaped macrocycles that can serve as the organogelators have been surprisingly rare; two planar macrocyclic fluoropentamers designed by us were highly able to gelate organic solvents, ... Ratiometric Fluorescent Sensor for Silver Ion and Its Resultant Complex for Iodide Anion in Aqueous Solution [作者：WANG HUANHUAN; XUE LIN; JIANG HUA,期刊：Organic Letters, 页码：3844-3847 , 文章类型： Article，,卷期：2011年13-15] In aqueous solution, sensor DQAg can selectively detect Ag(+) based on inhibition of the resonance, demonstrating a large hypsochromic shift of 84 nm and remarkable changes in the ratio (F(481) (nm)/F(565) nm) of the emi... Schicagenins A-C: Three Cagelike Nortriterpenoids from Leaves and Stems of Schisandra chinensis [作者：SHI YIMING; LI XINGYAO; LI XIAONIAN; LUO XIAO; XUE YONGBO; LIANG CHENGQIN; ZOU JUAN; KONG LINGMEI; LI YAN; PU JIANXIN; XIAO WEILIE; SUN HANDONG,期刊：Organic Letters, 页码：3848-3851 , 文章类型： Article，,卷期：2011年13-15] Schicagenins A-C (1-3), three unprecedented nortriterpenoids characterized with a tetracyclic oxa-cage motif and C(9) side chain, were discovered from the leaves and stems of Schisandra chinensis. Their structures were d... Eosin Y Catalyzed Visible Light Oxidative C-C and C-P bond Formation [作者：HARI DURGA PRASAD; KOENIG BURKHARD,期刊：Organic Letters, 页码：3852-3855 , 文章类型： Article，,卷期：2011年13-15] Eosin Y catalyzes efficiently the visible light mediated coupling of sp(3) C-H bonds adjacent to the nitrogen atom in tetrahydroisoquinoline derivatives in the absence of an external oxidant. Nitroalkanes, dialkyl malona... Regioselective Ring Opening and Isomerization Reactions of 3, 4-Epoxyesters Catalyzed by Boron Trifluoride [作者：IZQUIERDO JAVIER; RODRIGUEZ SANTIAGO; GONZALEZ FLORENCI V,期刊：Organic Letters, 页码：3856-3859 , 文章类型： Article，,卷期：2011年13-15] Efficient ring opening of 3,4-epoxyesters with alcohols to produce 4-alkoxy-3-hydroxyesters and their isomerization into 4-ketoesters using boron trifluoride as the catalyst are presented. Both transformations are simple... Stereodifferentiation in the Compartmentalized Photooxidation of a Protein-Bound Anthracene [作者：ALONSO RAFAEL; CONSUELO JIMENEZ M; MIRANDA MIGUEL A,期刊：Organic Letters, 页码：3860-3863 , 文章类型： Article，,卷期：2011年13-15] Encapsulation within transport proteins strongly reduces the photooxidation rate of (S)- and (R)-2-(9-anthracenyl)propanoic acid (1) and results in a significant stereodifferentiation. The most remarkable effects are obs... Regioselective Radical Bromoallylation of Allenes Leading to 2-Bromo-Substituted 1,5-Dienes [作者：KIPPO TAKASHI; FUKUYAMA TAKAHIDE; RYU ILHYONG,期刊：Organic Letters, 页码：3864-3867 , 文章类型： Article，,卷期：2011年13-15] The regioselective radical bromoallylation of allenes proceeded efficiently in the presence of AIBN as a radical initiator to give 2-bromo-substituted 1,5-dienes In excellent yields. The addition of a bromine radical too...