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Kim, Mi Suk,Park, Jeong Ku,Eum, Jin Seong,Sim, Woong Seop 한국식물학회 1996 Journal of Plant Biology Vol.39 No.3
The purpose of this study is to obtain the most efficient combination of Agrobacterium tumefaciens strains and Ti plasmids for the construction of dicotyledonous plant vector system. Ti plasmid-curing A. tumefaciens A136 and KU12C3 were transformed with four kinds of Ti plasmids, pTiBo542, pTiA6, pTiKU12 and pTiAch5, respectively. The stems of 28 species of dicotyledonous plants were then inoculated with these transformants and examined for crown gall formation. The different combination of A. tumefaciens strains and Ti plasmids showed quite a difference in terms of the crown gall formation. Agrobacterium strains A136 and KU12C3 have a same plant host range in case that both strains barbour the same kind of Ti plasmid, pTiBo542 or pTiAch5. However, the above-mentioned both strains have quite different host range in the event of containing the same Ti plasmid, pTiKU12 or pTiA6. In case that KU12C3 contains pTiA6 or pTiKU12, this strain has a wider plant host range than A136. The plant host range of pTiBo542 is the widest, followed by pTiA6, pTiKU12 and pTiAch5. Twelve plants among 28 tested plants are not transformed by any virulent Agrobacterium strains used in this study. In conclusion, A. tumefaciens KU12C3 and A136 harboring pTiBo542 showed the widest host range for transforming dicotyledonous plants. Also, it was acertained that the host range of Ti plasmids is affected by chromosomal level.
Pd 촉매하에서 유기주석 화합물과 Iodane 화합물의 Cross-Coupling 반응에 관한 연구
강석구,이홍우,김재선,최상철 성균관대학교 기초과학연구소 1996 論文集 Vol.47 No.1
The palladium-catalyzed coupling of organostannanes with iodanes(Koser's and Zefirov's reagents) in the presence of palladium catalyst was accomplished at room temperature under aqueous conditions to afford phenyl- or 4-iodophenyl-substituted products depending on the iodanes used.
Pd 촉매하에서 allylic alcohol과 hypervalent iodine 화합물의 위치 선택적 vinylation에 관한 연구
강석구,이홍우,장수범,김태현,편성재 성균관대학교 기초과학연구소 1995 論文集 Vol.46 No.2
The formation of carbon-carbon bond by palladium-catalyzed coupling of aryl or vinyl halides with olefins, known as the Heck reaction, has become a powerful tool in organic chemistry. In the case of allylic alcohols, palladium-catalyzed reaction of organic halides usually affords β-substituted ketones or aldehydes rether than β-substituted allylic alcohols.
강석구,김성규,조동규 성균관대학교 기초과학연구소 1992 論文集 Vol.43 No.2
키랄 1-chloro-2, 3-alkanediol 화합물과 CO(Im)₂과 반응에서 얻어진 Cyclic Carbonate 화합물을 Zn와 환원성 제거반응을 시켜 천연물의 합성에 유용한 광학활성 알릴알콜을 합성하였다. The cyclic carbonates obtained from reaction of 1-Chloro-2, 3-alkanediol with CO(Im)₂ was reductively eliminated with Zn to afford optically active allylic alcohols.
탄수화물에서 광학활성 중간체 O-보호된 (S)-와 (R)-3-히드록시 알데히드의 합성
강석구,조현성,심형수 성균관대학교 기초과학연구소 1993 論文集 Vol.44 No.1
탄수화물로부터 유도된 불포화 퓨라노스 고리계를 입체 선택적인 수소화 반응에 의해 chiral synthon인 광학활성의 (S)-3-포르밀옥시 알데히드를 합성하였고, 탄수화물에서 유도된 3-히드록시 퓨라노스를 Barton-McCombie의 deoxygenation반응에 의해 (R)-3-포르밀옥시 알데히드를 합성하였다. (S)-e-Formyloxyaldehydes, chiral synthons for natural products, were synthesized via highly stereoselective hydrogenation of the unsaturated furanose ring system derived from D-glucose or D-xylose. Alternatively, (R)-3-formyloxyaldehydes were prepared via deoxygenation of 3-hydroxyfuranoses.
Cu 촉매하에서 유기주석 화합물과 고분자에 결합된 Iodide의 Cross-Coupling 반응에 관한 연구
강석구,임권호,김재선,윤석근,윤승수 성균관대학교 기초과학연구소 1996 論文集 Vol.47 No.2
The copper iodide-catalyzed cross-coupling of polymer bound aryl iodide with organostannanesin N-methyl-2-pyrrolidone (NMP) was accomplishied smoothly in the presence of NaCl.
구리촉매를 이용한 유기주석화합물 및 유기붕소화합물과 다가 요오드 화합물과의 Cross-Coupling과 Carbonylative Cross-Coupling에 관한 연구
강석구,야마구치토쿠타로,김태현,호필수 성균관대학교 기초과학연구소 1996 論文集 Vol.47 No.2
The copper-catalyzed cross-coupling and carbonylative cross-coupling of organostannanes(aryl-, alkenyl-, alkynyl-, allylstannanes) and anoboranes(aryl-, alkenylboranes)with hypervalent aryl- and alkenyliodonium tetrafluoroborates were achieved at mild conditions.
탄수화물에 관한 연구 : 헥소퓨라노스고리의 입체선택적 변형 Stereoselective Modification of the Hexofuranose Ring
강석구,박영원 성균관대학교 기초과학연구소 1992 論文集 Vol.43 No.1
D-크실로스에서 얻어지는 퓨라노스고리를 변형시켜 천연물 합성의 중간체를 합성하는 입체선택적 반응을 연구하였다. 이 퓨라노스 고리의 C-3위치에 있는 히드록시기를 Swern산화 조건에서 산화시키는 방법을 연구한 후 얻어진 C-3위치에 케톤에 Grignard, Wittig 반응후 수소환원 등을 통해 퓨라노스고리의 C-3 위치에 입체선택적으로 치환기를 유도하는 방법을 연구하였다. The stereoselective modifications of the hexofuranose ring derived from D-xylose were studied. The method of the oxidation by the Swern oxidation condition on the C-3 position of this furanose ring was developed. Grignard reaction afforded the 3 alcohol, which was transformed into the allylic carbonate to introduce side chain stereoselectively. On the other hand, 3-ketofuranose was subjected to Wittig reaction followed by stereoselective hydrogenation to afford C-3 branched furanose system, which was elaborated to C-4 branched furanose.
(E)-γ-히드록시-α,β-불포화 슬폰과 니트릴의 합성
강석구,전제호 성균관대학교 기초과학연구소 1992 論文集 Vol.43 No.2
β,γ-에폭시슬폰과 β,γ-에폭시느트릴을 -78℃에서 THF를 용매로 LDA를 사용하여 탈 양성자-제거반응을 유도하면 선택적으로(E)-히드록시-α, β-불포화 니트릴을 좋은 수율로 각각 얻을 수 있었다. Deprotection-elimination of β, γ-epoxy sulfone and β, γ-epoxy nitrile with LDA in THF at -78℃ afforded (E)-γ-hydroxy-α, β-unsaturated sulfone and (E)-γ-hydroxy-α, β-unsaturated nitrile in good yields, respectively.
(6S, 7S)-Trans-Laurediol의 합성 연구
강석구,임종석 성균관대학교 1992 論文集 Vol.42 No.2
2-데옥시-D-리보스를 출발물질로 하여 2,3-이소프로필리덴디옥시 알데히드의 염기조건에서의 에피머화 반응을 주요 반응 단계로 하여(6S, 7S)-trans-Laurediol을 합성하였다. A synthesis of (6S, 7S)-trans-laurediol starting from 2-deoxy-d-ribose using the epimerization reaction of 2,3-isopropylidene aldehyde with treatment of base is described.