The asymmetrictransferhydrogenation of imines was performed with the use of a polymer-immobilized chiral catalyst. The chiral catalyst, prepared from crosslinked polystyrene-immobilized chiral 1,2-diamine monosulfonamide, was effective in the asymmetrictransferhydrogenation of N-benzyl imines in CH2Cl2 to give a chiral amine in high yield and good enantioselectivity. Furthermore, an amphiphilic
<scp>l</scp>-Valine derived chiral N-sulfinamides as effective organocatalysts for the asymmetric hydrosilylation of N-alkyl and N-aryl protected ketimines
作者:Chao Wang、Xinjun Wu、Li Zhou、Jian Sun
DOI:10.1039/c4ob01257g
日期:——
L-Valine derived N-sulfinamides have been developed as efficient enantioselective Lewis basic organocatalysts for the asymmetric reduction of N-aryl and N-alkyl ketimines with trichlorosilane. Catalyst 3c afforded up to 99% yield and 96% ee in the reduction of N-alkyl ketimines and up to 98% yield and 98% ee in the reduction of N-aryl ketimines.
Cr(III)(salen)Cl Catalyzed Enantioselective Intramolecular Addition of Tertiary Enamides to Ketones: A General Access to Enantioenriched 1<i>H</i>-Pyrrol-2(3<i>H</i>)-one Derivatives Bearing a Hydroxylated Quaternary Carbon Atom
作者:Luo Yang、De-Xian Wang、Zhi-Tang Huang、Mei-Xiang Wang
DOI:10.1021/ja904534t
日期:2009.8.5
Cr(III)(salen)Cl complex 3e, tertiaryenamides 1 underwent an efficient and enantioselectiveintramolecularaddition reaction to an activated carbonyl moiety to produce in excellent yield highly enantioenriched 1H-pyrrol-2(3H)-one derivatives 2 that bear a hydroxylated quaternary carbon atom. The synthetic application of resulting compounds has been demonstrated in the synthesis of (3S,5S)-3,5-diphenyl-3-pyrrolidinol
在手性 Cr(III)(salen)Cl 配合物 3e 的催化下,叔烯酰胺 1 与活性羰基部分进行了有效且对映选择性的分子内加成反应,以优异的产率产生了高度对映体富集的 1H-吡咯-2(3H)-one 衍生物 2带有羟基化季碳原子。所得化合物的合成应用已在(3S,5S)-3,5-二苯基-3-吡咯烷醇的合成中得到证明。
KOBu<sup>t</sup>/DMSO-Mediated α-C–H Vinylation of <i>N</i>-Benzyl Ketimines with Acetylene Gas: Stereoselective Synthesis of (<i>E</i>,<i>Z</i>)-2-Azadienes
作者:Ivan A. Bidusenko、Elena Yu. Schmidt、Nadezhda I. Protsuk、Igor A. Ushakov、Alexander V. Vashchenko、Andrei V. Afonin、Boris A. Trofimov
DOI:10.1021/acs.orglett.0c00564
日期:2020.4.3
Several imines, readily derived from aryl methyl ketones and benzylamines, react with acetylene gas in KOBut/DMSO system to afford 2-azadienes stereoselectively. This new C–C bond constructing reaction involves, instead of the expected ethynylation of the C═N bond, the addition of azaallyl anions to the triple bond of acetylene.
易于衍生自芳基甲基酮和苄胺的几种亚胺在KOBu t / DMSO系统中与乙炔气体反应,以立体选择性地得到2-氮杂二烯。这种新的C–C键构建反应涉及将乙二烯丙基阴离子加到乙炔的三键上,而不是C═N键的预期乙炔化。
Base-Catalyzed [3 + 2] Cycloaddition of <i>N-</i>Benzyl Ketimines to Arylacetylenes Followed by Oxidation: A One-Pot Access to Polyarylated 2<i>H</i>-Pyrroles via Intermediate Pyrrolines
作者:Ivan A. Bidusenko、Elena Yu. Schmidt、Igor A. Ushakov、Alexander V. Vashchenko、Boris A. Trofimov