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Jung Hwan Park,Hyunik Shin,Doo Han Park,이상기 대한화학회 2010 Bulletin of the Korean Chemical Society Vol.31 No.3
As a new strategy for the optimization of a chiral catalyst, the catalytic activity of the host-guest complexes of chiral bisphosphine bearing imidazolidinone was investigated in Rh-catalyzed asymmetric hydrogenation of enamide. Marginal enhancement in enantioselectivity was observed and the nature of interaction between host-guest was experimentally elucidated.
Kim, Hyeji,Lee, Jihong,Shin, Hyunik,Sohn, Jeong-Hun American Chemical Society 2018 Organic letters Vol.20 No.7
<P>A copper-mediated oxidative dehydrosulfurative carbon-oxygen cross-coupling reaction with boric ester and six-membered cyclic thiourea for single-step production of densely substituted 2-alkoxypyrimidines incorporated in a privileged scaffold is described. This is the first demonstration of boric ester acting as an alkoxy donor in a metal-catalyzed coupling reaction to produce ether. The reaction method offers a shortcut for producing 2-alkoxypyrimidine derivatives with rapid diversification and expands the utility of boric ester and the scope of Liebeskind-Srogl-type reactions.</P> [FIG OMISSION]</BR>
Kim, Ju Hyun,Shin, Hyunik,Lee, Sang-gi American ChemicalSociety 2012 Journal of organic chemistry Vol.77 No.3
<P>The intramolecular alkylative reactivity and N/C selectivity of the various Blaise reaction intermediates, which are formed from the reaction of the Reformatsky reagents with omega-chloroalkyl nitriles, did not reach the synthetic potential as an entry to exo-cyclic enaminoesters. To circumvent this issue, various additives were investigated, among which the addition of NaHMDS dramatically enhanced the reactivity and N/C selectivity. This modification provided a highly efficient route for the synthesis of various N-fused heterocyclic compounds, as it requires only two steps from nitriles.</P>
Decarboxylative cross-couplings of 2-aminopyrimidine-5-carboxylic acids
Le Pham, Ngoc Son,Lee, Jihong,Shin, Hyunik,Sohn, Jeong-Hun Elsevier 2018 Tetrahedron Vol.74 No.28
<P><B>Abstract</B></P> <P>Decarboxylative CC cross-couplings of 2-aminopyrimidine-5-carboxylic acids under a Pd/Ag-based catalytic system opens a new platform for the introduction of diverse C5 substituents. The reaction methods proceeded efficiently with a wide range of the acids and the coupling partners of aryl iodides, alkenes, bromoalkynes, and azoles. Considering ready availability of 2-aminopyrimidine-5-carboxylic acid from the oxidative dehydrosulfurative CN cross-coupling of the 3,4-dihydropyrimidin-1<I>H</I>-2-thiones, this reaction method unambiguously pave a shortcut to densely substituted 2-aminopyrimidine derivatives with unprecedented diversity.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Chen, Shu-Wei,Kim, Ju Hyun,Shin, Hyunik,Lee, Sang-gi Royal Society of Chemistry 2008 Organic & biomolecular chemistry Vol.6 No.15
<P>A novel 2<SUP>nd</SUP> generation Grubbs-type catalyst tethering an isopropoxystyrene has been synthesized and automatically polymerized in solution to form a self-supported polymeric Ru-carbene complex, which catalyzed ring-closing metathesis homogeneously, but was recovered heterogeneously.</P> <P>Graphic Abstract</P><P>A novel 2<SUP>nd</SUP> Grubbs-type catalyst tethering a styrene has been synthesized and automatically polymerized in solution to form a self-supported polymeric Ru-carbene complex, which catalyzed RCM homogeneously, but was recovered heterogeneously. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b809025d'> </P>
Man-Young Yoon,Hee Bong Lee,Hyunik Shin 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.2
An isolable activated ester, diethyl thiophosphoryl [(Z)-(2-aminothiazol-4-yl)-2-(methoxyimino)acetate (9a, DAMA) was prepared in high purity, which was at least stable for 7 d at 25 ^oC and 6 months at 5 ^oC. Its reaction with 7-ACA (4) in the presence of tributylamine in i-PrOH provided cefotaxime (1) of high purity in good yield. Preparation of DAMA and its reaction with 7-ACA (4) to 1 was performed in one-pot manner, respectively with minimal unit operations of stirring and filtration.