- Proline-Catalyzed Direct Inverse Electron Demand Diels-Alder Reactions of Ketones with 1,2,4,5-Tetrazines.
[作者:Xie, Hexin;Zu, Liansuo;Oueis, Hanine R.;Li, Hao;Wang, Jian;Wang, Wei;,期刊:Organic Letters, 页码:1923-1926 , 文章类型: 研究论文,,卷期:2008年10-10]
- An organocatalytic direct inverse electron demand Diels-Alder reaction of ketones with 1,2,4,5-tetrazines I (Ar = 2-pyridyl, 4-pyridyl, Ph, 2-ClC6H4) has been developed. The process is efficiently catalyzed by proline t...
- Flexible Protocol for the Chemo- and Regioselective Building of Pyrroles and Pyrazoles by Reactions of Danishefsky's Dienes with 1,2-Diaza-1,3-butadienes.
[作者:Attanasi, Orazio A.;Favi, Gianfranco;Filippone, Paolino;Giorgi, Gianluca;Mantellini, Fabio;Moscatelli, Giada;Spinelli, Domenico;,期刊:Organic Letters, 页码:1983-1986 , 文章类型: 研究论文,,卷期:2008年10-10]
- Compounds (More Than One Hetero Atom)) Section The versatility of the Mukaiyama-Michael-type addn./heterocyclization of Danishefsky's diene with 1,2-diaza-1,3-butadienes was applied to the synthesis of both 4-hydrogen-1-...
- Synthesis of 5-Vinylideneoxazolidin-2-ones by DBU-Mediated CO2-Fixation Reaction of 4-(Benzylamino)-2-butynyl Carbonates and Benzoates.
[作者:Yoshida, Masahiro;Komatsuzaki, Yuki;Ihara, Masataka;,期刊:Organic Letters, 页码:2083-2086 , 文章类型: 研究论文,,卷期:2008年10-10]
- A CO2-fixation reaction of 4-(benzylamino)-2-butynyl carbonates and benzoates, carried out in the presence of DBU, provides substituted 5-vinylideneoxazolidin-2-ones, e.g, I. The reaction has been successfully applied t...
- Michael Addition of Ortho-Lithiated Aryloxiranes to a,b-Unsaturated Malonates: Synthesis of Tetrahydroindenofuranones.
[作者:Salomone, Antonio;Capriati, Vito;Florio, Saverio;Luisi, Renzo;,期刊:Organic Letters, 页码:1947-1950 , 文章类型: 研究论文,,卷期:2008年10-10]
- A short and efficient synthesis of tetrahydroindenofuranones, e.g., I, based on the Michael addn. of ortho-lithiated aryloxiranes to alkylidene malonates followed by the nucleophilic oxirane ring-opening and subsequent l...
- Triazolylpyrenes: Synthesis, Fluorescence Properties, and Incorporation into DNA.
[作者:Werder, Sarah;Malinovskii, Vladimir L.;Haener, Robert;,期刊:Organic Letters, 页码:2011-2014 , 文章类型: 研究论文,,卷期:2008年10-10]
- Synthesis of 1,6- and 1,8-triazolylpyrenes I and II and their incorporation into oligonucleotides is described. In hybrids, triazolylpyrenes adopt interstrand stacking interactions. Exciton coupling is obsd. for the du...
- A highly effective cobalt catalyst for olefin aziridination with azides: hydrogen bonding guided catalyst design.
[作者:Ruppel, Joshua V.;Jones, Jess E.;Huff, Chelsea A.;Kamble, Rajesh M.;Chen, Ying;Zhang, X. Peter;,期刊:Organic Letters, 页码:1995-1998 , 文章类型: 研究论文,,卷期:2008年10-10]
- The [Co(II) complex of a new porphyrin deriv. [Co(P1)], which was designed on the basis of potential hydrogen-bonding interactions in the metal-nitrene intermediate, is a highly active aziridination catalyst with azides....
- Synthesis and stereochemistry-activity relationship of small bacteriocin, an autoinducer of the symbiotic nitrogen-fixing bacterium Rhizobium leguminosarum.
[作者:Yajima, Arata;van Brussel, Anton A. N.;Schripsema, Jan;Nukada, Tomoo;Yabuta, Goro;,期刊:Organic Letters, 页码:2047-2050 , 文章类型: 研究论文,,卷期:2008年10-10]
- The four stereoisomers I of small bacteriocin, an autoinducer of the symbiotic nitrogen-fixing bacterium Rhizobium leguminosarum, were synthesized via a versatile methodol. for 3'-hydroxyacyl homoserine lactones based on...
- Biphenylene-Substituted Ruthenocenylphosphine for Suzuki-Miyaura Coupling of Aryl Chlorides.
[作者:Hoshi, Takashi;Nakazawa, Taichi;Saitoh, Ippei;Mori, Ayako;Suzuki, Toshio;Sakai, Jun-ichi;Hagiwara, Hisahiro;,期刊:Organic Letters, 页码:2063-2066 , 文章类型: 研究论文,,卷期:2008年10-10]
- High activity in the palladium-catalyzed Suzuki-Miyaura reactions of aryl chlorides with arylboronic acids was furnished using biphenylene-substituted di-tert-butylruthenocenylphosphine (R-Phos) as a supporting ligand. ...
- Asymmetric Transfer Hydrogenation of b,g-Alkynyl a-Imino Esters by a Bronsted Acid.
[作者:Kang, Qiang;Zhao, Zhuo-An;You, Shu-Li;,期刊:Organic Letters, 页码:2031-2034 , 文章类型: 研究论文,,卷期:2008年10-10]
- Asym. synthesis of trans-alkenyl a-amino esters was realized by chiral phosphoric acid catalyzed transfer hydrogenation of b,g-alkynyl a-imino esters. Utilizing Hantzsch esters as the hydrogen donor, both the alkyne and...
- First Asymmetric Total Syntheses of Cernuane-Type Lycopodium Alkaloids, Cernuine, and Cermizine D.
[作者:Nishikawa, Yasuhiro;Kitajima, Mariko;Takayama, Hiromitsu;,期刊:Organic Letters, 页码:1987-1990 , 文章类型: 研究论文,,卷期:2008年10-10]
- The first total syntheses of two cernuane-type Lycopodium alkaloids, (-)-cernuine (I) and (+)-cermizine D (II), were accomplished starting from (+)-citronellal. The syntheses involved organocatalytic a-amination to affo...
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