Thanh Thien Co

Kyungpook National University, Daikyū, Daegu, South Korea

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Publications (7)13.03 Total impact

  • Jong-Dae Lee · Thanh Thien Co · Tae-Jeong Kim · Sang Ook Kang
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    ABSTRACT: ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
    No preview · Article · Aug 2009 · ChemInform
  • Jong-Dae Lee · Thanh Thien Co · Tae-Jeong Kim · Sang Ook Kang
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    ABSTRACT: o-Carborane-based chiral phosphinooxazoline (Cab-PHOX) ligands were synthesized for the first time and applied to the iridium and rhodium-catalyzed hydrogenation of unfunctionalized and functionalized olefins with an enantioselectivity of up to 98% and 96%, respectively. The modularity of the Cab-PHOX ligands is highlighted by the facile preparation of a variety of sterically and electronically different ligands.
    No preview · Article · Mar 2009 · Synlett
  • Thanh Thien Co · Tae-Jeong Kim
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    ABSTRACT: A series of chiral (iminophosphoranyl)ferrocenes (1-3) are highly efficient ligands for Rh- and Ir-catalyzed hydrogenation of a number of unfunctionalized olefins; almost perfect enantiomeric excesses (up to 99% ee) have been achieved under mild reaction conditions.
    No preview · Article · Oct 2006 · Chemical Communications
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    ABSTRACT: A series of new chiral [iminophosphoranyl]ferrocenes, {}Fe{} (1: R = Me, ), {}Fe{} (2: , OMe), and {} (3:R = Ph, ) have been prepared from the reaction of [1,1'-diphenylphosphino-2-(N,N-dimethylamino) ethyl]ferrocene with arylazides (1 & 2) and the reaction of phosphine dichlorides () with [1,1'-diphenylphosphino-2-aminoethyl]ferrocene (3), respectively. They form palladium complexes of the type (4-6: L = 1-3), where the ligand (L) adopts an -P,N (3) as expected. In the case of 1, a potential terdentate, an -P,N mode is realized with the exclusion of the ?=NAr group from the coordination sphere. Complexes 4-6 were employed as catalysts for allylic alkylation of 1,3-diphenylallyl acetate leading to an almost stoichiometric product yield with modest enantiomeric excess (up to 74% ee). Rh(I)-complexes incorporating 1-3 were also prepared in situ for allylic alkylation of cinnamyl acetate as a probe for both regio- and enantioselectivities of the reaction. The reaction exhibited high regiocontrol in favor of a linear achiral isomer regardless of the ligand employed.
    Full-text · Article · Feb 2006 · ChemInform
  • Thanh Thien Co · Sang Chul Shim · Chan Sik Cho · Tae-Jeong Kim
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    ABSTRACT: A series of new chiral (iminophosphoranyl)ferrocenes, {η5-C5H4-(PPh2N-2,6-R2-C6H3)}Fe{η5-C5H3-1-PPh2-2-CH(Me)(Y)} (1a, Y = NMe2, R = Me; 1b, Y = NMe2, R = iPr; 1c, Y = OMe, R = iPr), {η5-C5H4-(PPh2N-2,6-R2-C6H3)}Fe{η5-C5H3-1-(PPh2N-2,6-R2-C6H3)-2-CH(Me)(Y)} (2a, R = Me, Y = NMe2; 2b, R = iPr, Y = NMe2,; 2c, R = Me, Y = OMe), and (η5-C5H5)Fe{η5-C5H4-1-PR2-2-CH(Me)NPPh3} (3a, R = Ph; 3b, R = C6H11), have been prepared from the reaction of 1,1‘-bis(diphenylphosphino)-2-[(dimethylamino)ethyl]ferrocene with aryl azides (1 and 2) and the reaction of phosphine dichlorides (R3PCl2) with 1,1‘-bis(diphenylphosphino)-2-(aminoethyl)ferrocene (3), respectively. They form rhodium complexes of the type [Rh(NBD)(L)]ClO4 (4−6; L = 1−3), where the ligand (L) adopts an η2(N,N) (2) or η2(P,N) mode (3), as expected. In the case of 1, a potential tridentate species, however, a chelating bidentate mode through the −CH(Me)NMe2 and −PPh2 groups is realized with the exclusion of the −PNAr group from the coordination sphere, as confirmed by the X-ray crystal structure of [Rh(NBD)(1b)]ClO4 (4b). The new ligands (1−3) exhibit exceptionally high enantioselectivity (up to 99%) and catalytic activity in the Rh-catalyzed asymmetric hydrogenation of (E)-2-methylcinnamic acid, (Z)-2-acetamidocinnamate, and (Z)-2-acetamidoacrylate.
    No preview · Article · Sep 2005 · ChemInform
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    ABSTRACT: The reaction of 1,2-ferrocenediylazaphosphinines (1a, R1 = H; 1b, R1 = Me; 1c, R1 = Ph) with M(CO)6 (M = Mo, W), MX(CO)5 (M = Mn, Re; X = Br, Cl), and [Pd(η3-C3H5)Cl]2 shows a strong tendency to adopt an unusual chelating bidentate coordination through nitrogen and the carbonyl oxygen, yielding M(η2-N,O)(CO)4 (2, M = Mo; 3, M = W), M(η2-N,O)(X)(CO)3 (6, M = Mn, X = Br; 7, M = Re, X = Cl), and [Pd(η2-N,O)(η3-C3H5)]BF4 (after treatment with AgBF4) (8), respectively. X-ray crystallographic structure determinations of 3a (R1 = H) and 8a (R1 = H) show the formation of a five-membered metallacycle with the distance of the metal−carbonyl oxygen bond being shorter than that of the metal−nitrogen bond in both compounds. The complexes 2 and 3 further undergo oxidative addition with allyl iodide to yield the corresponding M(II) complexes of the type [M(η2-N,O)( η3-C3H5)(I)(CO)2] (4, M = Mo; 5, M = W). Complexes 2−5 and 8 were employed as catalysts for nucleophilic allylic substitution of allyl acetates as a probe for both regio- and enantioselectivities of the reaction. All reactions involving unsymmetrical allyl acetates (E)-RCHCHCH2OAc (R = Pr, Ph) led exclusively to the formation of achiral linear product (E)-RCHCHCH2Nu regardless of the type of catalysts, the ligand, or the allyl substrate employed. One exception to the above statement is the observation that Mo- and W-based catalysts (2−5) are totally inactive toward the allylic substitution of cinnamyl acetate (R = Ph). Asymmetric allylic alkylation of a symmetrically 1,3-disubstituted substrate, PhCHCHCH(OAc)Ph, is accomplished only by Pd-catalysts (8) with enantiomeric excesses up to 50% ee.
    No preview · Article · Feb 2003 · ChemInform
  • SH Paek · TT Co · DH Lee · YC Park · TJ Kim
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    ABSTRACT: The synthesis and catalytic application of a new class of planar chiral ferrocenes. 1,2-ferroconediylazaphosphinines (1 and 2) are described. They are powerful ligands for the copper(I)-catalyzed asymmetric cyclopropanation of a range of alkenes with diazo esters to exhibit an exceptionally high degree of diastereoselectivity (similar to100% de) in favor of trans isomers, regardless the structure of the olefins and the diazo compounds. Comparative studies between 1 and 2 reveal that the former works better in terms of diastereocontrol. In contrast, however, enantioselectivity is low with both 1 and 2 as a whole although, in certain cases with a proper combination of the olefin and the diazo ester, high optical yields (up to 100% ee) can be achieved. Other reaction parameters such as the reaction temperature and the structure of the ligand do exhibit some influence, although infinitestimal, on both chemical and optical yields.
    No preview · Article · Dec 2002 · Bulletin- Korean Chemical Society