Kee-Young Lee

article

Certain numbers on the groups of self-homotopy equivalences

Ho Won Choi, Kee Young Lee

Topology and its Applications > 2015 > 181 > Complete > 104-111

For a connected based space X, let [X,X] be the set of all based homotopy classes of base point preserving self map of X and let E(X) be the group of self-homotopy equivalences of X. We denote by A♯k(X) the set of homotopy classes of self-maps of X that induce an automorphism of πi(X) for i=0,1,⋯,k. That is, [f]∈A♯k(X) if and only if πi(f):πi(X)→πi(X) is an isomorphism for i=0,1,⋯,k. Then, E(X)⊆A♯k(X)⊆[X,X]...

article

Hot forging design of as-cast NiTi shape memory alloy

Jong-Taek Yeom, Jeoung Han Kim, Jae-Keun Hong, Seong Woong Kim, more

Materials Research Bulletin > 2014 > 58 > Complete > 234-238

A hot forging process of an as-cast NiTi shape memory alloy was designed by processing maps and a finite element method analysis. The NiTi alloy samples used in this study were made using a vacuum plasma arc melting process. In order to analyze the microstructural change and flow behavior of the as-cast NiTi alloy during the ingot breakdown process, high temperature compression tests were carried...

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Efficient and stereoselective syntheses of DAB-1 and d-fagomine via chiral 1,3-oxazine

Ji-Yeon Kim, Yu Mu, Xiangdan Jin, Seok-Hwi Park, more

Tetrahedron > 2011 > 67 > 48 > 9426-9432

The concise, stereocontrolled syntheses of DAB-1 and d-fagomine were achieved utilizing chiral oxazine. The key features in these strategies are the stereoselective intramolecular oxazine formation catalyzed by palladium(0), and pyrrolidine and piperidine formation by catalytic hydrogenation of oxazine.

article

Stereoselective intramolecular cyclization of γ-allylbenzamide via π–allylpalladium complex catalyzed by Pd(0)

Van-Thoai Pham, Jae-Eun Joo, Kee-Young Lee, Tai-Won Kim, more

Tetrahedron > 2010 > 66 > 12 > 2123-2131

An efficient procedure for synthesizing oxazines was developed by the palladium(0)-catalyzed intramolecular cyclization of a benzamide through a π-allylpalladium (II) complex. Interestingly, the diastereoselectivity of oxazine ring formation was dominantly controlled by the bulkiness of various protecting groups on the secondary alcohols.

article

Asymmetric Synthesis of (−)-Swainsonine

Yong-Shou Tian, Jae-Eun Joo, Bae-Soo Kong, Van-Thoai Pham, more

The Journal of Organic Chemistry > 2009 > 74 > 10 > 3962 - 3965

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Stereoselective total synthesis of (2S,3R)-3-hydroxypipecolic acid

Van-Thoai Pham, Jae-Eun Joo, Yong-Shou Tian, Yun-Sung Chung, more

Tetrahedron: Asymmetry > 2008 > 19 > 3 > 318-321

A concise, stereocontrolled synthesis of (2S,3R)-3-hydroxypipecolic acid 1 is described. Key features involve diastereoselective oxazoline formation catalyzed by palladium(0) and intramolecular cyclization by catalytic hydrogenation of an oxazoline.

article

Application of Pd(0)-Catalyzed Intramolecular Oxazine Formation to the Efficient Total Synthesis of (−)-Anisomycin

Jae-Eun Joo, Kee-Young Lee, Van-Thoai Pham, Yong-Shou Tian, more

Organic Letters > 2007 > 9 > 18 > 3627 - 3630

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Total synthesis of 1-deoxygulonojirimycin. Revision of the absolute configuration of the natural product

Sung-Jae Pyun, Kee-Young Lee, Chang-Young Oh, Jae-Eun Joo, more

Tetrahedron > 2005 > 61 > 6 > 1413-1416

A concise, stereoselective synthesis of 1-deoxygulonojirimycin was achieved and the absolute configuration of the natural product was revised. Key features involve diastereoselective oxazoline formation catalyzed by palladium(0), RCM and dihydroxylation.

article

Asymmetric synthesis of (+)-L-733,060

Youn-Jung Yoon, Jae-Eun Joo, Kee-Young Lee, Yong-Hyun Kim, more

Tetrahedron Letters > 2005 > 46 > 5 > 739-741

A concise, stereocontrolled synthesis of (+)-L-733,060 was achieved. Key features involve diastereoselective oxazoline formation catalyzed by palladium(0) and intramolecular cyclization by catalytic hydrogenation of an oxazoline.

article

Gottlieb groups of homogeneous spaces

Kee-Young Lee, Mamoru Mimura, Moo Ha Woo

Topology and its Applications > 2004 > 145 > 1-3 > 147-155

In this paper, we compute the Gottlieb groups of the 2- dimensional sphere S2 and give the lower bounds of the order of the kth Gottlieb subgroup of the quaternionic projective n-space HPn for some integers k. Moreover, we obtain some information of lower bounds or infinities of the order of the Gottlieb groups of various homogeneous spaces.

article

Stereoselective synthesis of (+)-spectaline

Yiu-Suk Lee, Yong-Ho Shin, Yong-Hyun Kim, Kee-Young Lee, more

Tetrahedron: Asymmetry > 2003 > 14 > 1 > 87 - 93

Our synthesis of (+)-spectaline revealed that the methodology involving diastereoselective palladium(0)-catalyzed oxazoline formation and intramolecular reductive amination by catalytic hydrogenation of an oxazoline is an effective method for the asymmetric synthesis of natural products possessing complex functionalized piperidine cores.

article

Total synthesis of myriocin

Kee-Young Lee, Chang-Young Oh, Yong-Hyun Kim, Jae-Eun Joo, more

Tetrahedron Letters > 2002 > 43 > 51 > 9361 - 9363

A concise, stereocontrolled synthesis of myriocin was achieved. Key features involve diastereoselective oxazoline formation catalyzed by palladium(0), MgBr ₂ -promoted allylic stannane addition, and palladium(0)-catalyzed coupling of a vinyl iodide with an organozinc reagent.

article

Total Synthesis of Sphingofungin F

Kee-Young Lee, Chang-Young Oh, Won-Hun Ham

Organic Letters > 2002 > 4 > 25 > 4403 - 4405

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Intramolecular TiCl4-mediated cyclization reaction of β-hydroxy alkynyl acetals

Yong-Hyun Kim, Kee-Young Lee, Chang-Young Oh, Jae-Gwon Yang, more

Tetrahedron Letters > 2002 > 43 > 5 > 837-841

Intramolecular TiCl₄-mediated cyclization reaction of 1,1-dimethoxy-3-hydroxy-hex-5-yne derivatives produced anti-1-hydroxy-3-methoxy-cyclohex-5-ene derivatives with high diastereoselectivity via antiperiplanar manner on pseudo six-membered chair like conformation (transition state A).

article

Cocyclic morphisms and dual G-sequences

Kee Young Lee, Moo Ha Woo

Topology and its Applications > 2001 > 116 > 1 > 123-136

In this paper, we first show the monomorphicity of a map implies exactness of G-sequence of the map relative to any space. Next we introduce the concept of cocyclic morphisms in the category of pairs and certain homotopy invariants. We also study its properties, especially, the duality between cyclic morphisms and cocyclic morphisms. Finally we introduce the dual G-sequences in the category of pairs...

article

A Highly Stereocontrolled Asymmetric Synthesis of the Taxol C-13 side chain; (4S, 5R)-2,4-Diphenyloxazoline-5-carboxylic acid

Kee-Young Lee, Yong-Hyun Kim, Min-Sung Park, Won-Hun Ham

Tetrahedron Letters > 1998 > 39 > 44 > 8129-8132

A stereoselective synthesis of (4S, 5R)-2,4-diphenyloxazoline-5-carboxylic acid, a precursor of the Taxol C-13 side chain was achieved using palladium-catalyzed oxazoline formation reaction from commercially available amino acid.

article

A Formal Total Synthesis of (±)-Ferruginine by Pd-catalyzed Intramolecular Aminocarbonylation.

Won-Hun Ham, Young Hoon Jung, Kyunghae Lee, Chang-Young Oh, more

Tetrahedron Letters > 1997 > 38 > 18 > 3247-3248

A practical and efficient synthetic route to the neuroactive alkaloid ferruginine has been developed. 8-Azabicyclo[3.2.1]octane skeleton 4 was prepared in one step by intramolecular aminocarbonylation of 3 catalyzed by palladium.

INFONA - science communication portal

Search results for: Kee-Young Lee

Certain numbers on the groups of self-homotopy equivalences

Hot forging design of as-cast NiTi shape memory alloy

Efficient and stereoselective syntheses of DAB-1 and d-fagomine via chiral 1,3-oxazine

Stereoselective intramolecular cyclization of γ-allylbenzamide via π–allylpalladium complex catalyzed by Pd(0)

Asymmetric Synthesis of (−)-Swainsonine

Stereoselective total synthesis of (2S,3R)-3-hydroxypipecolic acid

Application of Pd(0)-Catalyzed Intramolecular Oxazine Formation to the Efficient Total Synthesis of (−)-Anisomycin

Total synthesis of 1-deoxygulonojirimycin. Revision of the absolute configuration of the natural product

Asymmetric synthesis of (+)-L-733,060

Gottlieb groups of homogeneous spaces

Stereoselective synthesis of (+)-spectaline

Total synthesis of myriocin

Total Synthesis of Sphingofungin F

Intramolecular TiCl4-mediated cyclization reaction of β-hydroxy alkynyl acetals

Cocyclic morphisms and dual G-sequences

A Highly Stereocontrolled Asymmetric Synthesis of the Taxol C-13 side chain; (4S, 5R)-2,4-Diphenyloxazoline-5-carboxylic acid

A Formal Total Synthesis of (±)-Ferruginine by Pd-catalyzed Intramolecular Aminocarbonylation.

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