Abstract:
PURPOSE: Provided are a chiral salen derivative bonded to a polymer and a chiral salen-metal complex produced from the chiral salen derivative polymer, wherein the chiral salen-metal complex is used as a chiral catalyst in an asymmetric epoxidation of olefin. CONSTITUTION: The chiral salen derivative is represented by the formula 1 and the chiral salen-metal complex is represented by the formula 5, wherein m is 0 or 1, n is an integer of 0-24, Y is O, NH, or C(O)NH, p is a polymer insoluble in water and organic solvents, H(1) and H(2) are trans each other, M is a transition metal ion selected from the group consisting of Cr, Mn, V, Fe, Mo, W, Ru, Co, Ti, and Os, and A is an anion selected from the group consisting of Cl-, CH3COO-, PF6-, and SbF6-.
Abstract:
PURPOSE: Provided are a chiral salen derivative used as a chiral ligand in an asymmetric epoxidation of olefin for producing chiral epoxy compounds and a chiral salen-metal derivative used as a chiral catalyst in the asymmetric epoxidation of olefin. CONSTITUTION: The chiral salen derivative is represented by the formula 1 and the chiral salen-metal derivative is represented by the formula 3, wherein R is C1-C24 straight or branched alkyl, halogen, alcohol, mercapto, or carboxyl-substituted C1-C24 straight or branched alkyl, cycloalkyl, aryl, or heteroaryl, H(1) and H(2) are trans each other, M is a transition metal ion such as Cr, Mn, V, Fe, Mo, W, Ru, Co, Ti, or Os, and A is an anion such as Cl-, CH3COO-, PF6-, or SbF6-.
Abstract:
본 발명은 출발물질로서 다음 구조식(Ⅱ)의 (R)-4-(트리클로로메틸)옥세탄-2-온을 산 촉매 하에 C 1 -C 10 지방족 알코올 또는 벤질알코올과 반응시켜 다음 일반식(Ⅲ)의 (R)-3-히드록시-4,4,4-트리클로로부티르산 에스테르를 제조한 다음, 일반식(Ⅲ)의 화합물의 4-위치를 선택적으로 탈염소화(Bis-dechlorination)시키는 것으로 이루어진 다음 일반식(I)의 (R)-3-히드록시-4-클로로부티르산 에스테르의 제조방법에 관한 것이다.
상기 식에서 R은 C 1 -C 18 의 지방족 알킬기 또는 벤질기이다. 본 발명의 제조방법은 (R)-카르니틴 또는 (R)-3-히드록시-4-아미노부티르산의 제조에 이용되는 핵심 중간체인 (R)-3-히드록시-4-클로로부티르산 에스테르를 매우 높은 수율로 또한 광학적으로 순수한 형태로 얻을 수 있다.
Abstract:
The new compound as methyl 1-(3-triethoxysylyl propylcarbamoyl) benzimidazol-2-yl carbamate (I) as antifungal is prepared by reacting 2- benzimidazole carbamate and isocyanato propyl triethoxyl silane in benzene, toluene, methylene chloride, chloroform or tetracarbon at 80'C for 24 hrs to get (I). (I) as antifungal is useful for rice.
Abstract:
PURPOSE: Provided is a process for producing an optically active amino alcohol compound from an olefin compound in high optical purity and high yield in the presence of osmium tetroxide(OsO4) fixed on a polymer adsorbent, as a catalyst, by an asymmetric aminohydroxylation. CONSTITUTION: The process comprises the steps of: (1) dissolving a nitrogen source in a solvent and stirring and adding a basic water solution; (2) adding the osmium tetroxide fixed on a polymer adsorbent to the solution of the step (1), wherein the polymer is a copolymer containing styrene, substituted styrene, acrylate, or methacrylate monomers and having a vinyl group residue; (3) adding a chiral ligand to the solution of the step (2) and stirring; (4) adding an olefin to the solution of the step (3) and stirring.
Abstract:
본 발명은 키랄 에폭사이드를 제조하는 방법에 관한 것으로서, 구체적으로 이온성 액체 용매에서 키랄 살렌금속촉매 존재하에 올레핀과 산화제를 반응시켜 비대칭 에폭시화 반응에 의해 키랄 에폭사이드를 제조하는 방법에 관한 것으로, 본 발명의 제조방법에 의하면 반응 후 고가의 키랄 살렌금속촉매의 회수를 용이하게 하여 반복적으로 사용할 수 있으므로 경제적으로 키랄 에폭사이드를 제조할 수 있다.