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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45条记录   Organocatalytic Michael Addition of Aldehydes to g-Keto-a,b-unsaturated Esters. An Efficient Entry to Versatile Chiral Building Blocks. [作者：Wang, Jing;Ma, Anqi;Ma, Dawei;,期刊：Organic Letters, 页码：5425-5428 , 文章类型： 研究论文，,卷期：2008年10-23] The diarylprolinol silyl ether/HOAc-catalyzed Michael addn. of aldehydes to g-keto-a,b-unsatd. esters occurs in a highly regioselective and enantioselective manner. The adducts could easily be converted into synthetical... Iron-Catalyzed Enyne Cross-Coupling Reaction. [作者：Hatakeyama, Takuji;Yoshimoto, Yuya;Gabriel, Toma;Nakamura, Masaharu;,期刊：Organic Letters, 页码：5341-5344 , 文章类型： 研究论文，,卷期：2008年10-23] In the presence of 0.5-1 mol % of FeCl3 with lithium bromide as a crucial additive, alkynyl Grignard reagents, prepd. from the corresponding alkynes and methylmagnesium bromide, react with alkenyl bromides or triflates t... Tin-Free Enantioselective Radical Reactions Using Silanes. [作者：Sibi, Mukund P.;Yang, Yong-Hua;Lee, Sunggi;,期刊：Organic Letters, 页码：5349-5352 , 文章类型： 研究论文，,卷期：2008年10-23] Readily available hexyl silane is an excellent choice as a H-atom donor and a chain carrier in Lewis acid mediated enantioselective radical reactions. Conjugate radical addns. to a,b-unsatd. imides at room temp. proceed... "Pure by NMR"?. [作者：Claridge, Timothy D. W.;Davies, Stephen G.;Polywka, Mario E. C.;Roberts, Paul M.;Russell, Angela J.;Savory, Edward D.;Smith, Andrew D.;,期刊：Organic Letters, 页码：5433-5436 , 文章类型： 研究论文，,卷期：2008年10-23] Integration of a 13C-1H satellite peak of a given 12C-1H parent resonance within a quant. 1H NMR spectrum and comparison to the minor component represents a simple protocol for the accurate detn. of diastereoisomeric rat... Biased Helical Folding of Chiral Oligoindole Foldamers. [作者：Naidu, Veluru Ramesh;Kim, Min Cheol;Suk, Jae-min;Kim, Ho-Joong;Lee, Myongsoo;Sim, Eunji;Jeong, Kyu-Sung;,期刊：Organic Letters, 页码：5373-5376 , 文章类型： 研究论文，,卷期：2008年10-23] Oligoindole-based chiral foldamers have been synthesized by incorporating (S)- or (R)-1-phenylethylamine to both ends of the tetraindole scaffold. The oligoindoles fold into a helical conformation upon binding an anion ... Molecular Design and Preparation of Bis-isophthalate Electrochromic Systems having Controllable Color and Bistability. [作者：Sharmoukh, W.;Ko, Kyoung Chul;Park, So Yeon;Ko, Ju Hong;Lee, Ji Min;Noh, Changho;Lee, Jin Yong;Son, Seung Uk;,期刊：Organic Letters, 页码：5365-5368 , 文章类型： 研究论文，,卷期：2008年10-23] New electrochromic systems based on bis-isophthalates were designed and prepd. They showed electrochromism behavior by two-electron redn. The displayed colors showed greatly enhanced bistability and were dependent on t... Insights Into Palladium-Catalyzed Cyanation of Bromobenzene: Additive Effects on the Rate-Limiting Step. [作者：Buono, Frederic G.;Chidambaram, Rama;Mueller, Richard H.;Waltermire, Robert E.;,期刊：Organic Letters, 页码：5325-5328 , 文章类型： 研究论文，,卷期：2008年10-23] Kinetic studies using reaction calorimetry were conducted under synthetically relevant conditions to study the effect of additives in the cyanation of bromobenzene catalyzed by palladium complexes. This work demonstrate... Turning on Fluorescent Emission from C-Alkylation on Quinoxaline Derivatives. [作者：Son, Ho-Jin;Han, Won-Sik;Wee, Kyung-Ryang;Yoo, Dae-Hwan;Lee, Jong-Ho;Kwon, Soon-Nam;Ko, Jaejung;Kang, Sang Ook;,期刊：Organic Letters, 页码：5401-5404 , 文章类型： 研究论文，,卷期：2008年10-23] Redn. on imine moiety (C=N) of quinoxalines by alkyl-/aryllithiums led to a geometrical change on the quinoxaline ring, thereby perturbing the electronic structure to turn on fluorescence emission. Such a structural cha... Electronic and Steric Effects in Binding of Deep Cavitands. [作者：Hooley, Richard J.;Shenoy, Siddhartha R.;Rebek, Julius, Jr.;,期刊：Organic Letters, 页码：5397-5400 , 文章类型： 研究论文，,卷期：2008年10-23] A deep, self-folding cavitand responds to minor electronic differences between suitably sized adamantane guests. Binding consts. range from < 0.5 to 4000 M-1 for guests as similar as 1-bromoadamantane and 1-cyanoadamant... Mapping the Active Site in a Chemzyme: Diversity in the N-Substituent in the Catalytic Asymmetric Aziridination of Imines. [作者：Zhang, Yu;Lu, Zhenjie;Desai, Aman;Wulff, William D.;,期刊：Organic Letters, 页码：5429-5432 , 文章类型： 研究论文，,卷期：2008年10-23] The active site of the aziridination catalyst derived from either the VANOL or VAPOL ligand and B(OPh)3 is larger than expected and can accommodate not only significant substitution on the diarylmethyl unit of the imine ... Efficient Synthesis of N-2-Aryl-1,2,3-Triazole Fluorophores via Post-Triazole Arylation. [作者：Liu, Yuxiu;Yan, Wuming;Chen, Yunfeng;Petersen, Jeffrey L.;Shi, Xiaodong;,期刊：Organic Letters, 页码：5389-5392 , 文章类型： 研究论文，,卷期：2008年10-23] Efficient post-triazole regioselective N-2 arylation was developed from C-4, C-5 disubstituted-1,2,3-triazoles. Three different approaches had been investigated, including SNAr, Cu(I) catalyzed aryl amidation, and Cu(II... Alkali Metals in Silica Gel (M-SG): A New Reagent for Desulfonation of Amines. [作者：Nandi, Partha;Redko, Mikhail Y.;Petersen, Kathryn;Dye, James L.;Lefenfeld, Michael;Vogt, Paul F.;Jackson, James E.;,期刊：Organic Letters, 页码：5441-5444 , 文章类型： 研究论文，,卷期：2008年10-23] A novel method for the desulfonation of secondary amines is were found to be useful solid-state reagents for the desulfonation of a range of N,N-disubstituted sulfonamides. M-SG reagents are room-temp.-stable free-flowi... Cylindradines A and B: Novel Bromopyrrole Alkaloids from the Marine Sponge Axinella cylindratus. [作者：Kuramoto, Makoto;Miyake, Norimichi;Ishimaru, Yoshihisa;Ono, Noboru;Uno, Hidemitsu;,期刊：Organic Letters, 页码：5465-5468 , 文章类型： 研究论文，,卷期：2008年10-23] The novel alkaloids cylindradines A (I) and B (II) were isolated from Axinella cylindratus, and their structures were elucidated by spectroscopic analyses. Stereochemistries of these compds. were detd. by X-ray anal. C...