Abstract:
PURPOSE: Provided is a process for producing a chiral compound by using an enantioselective ring-opening reaction of epoxides in the presence of a chiral salen metal catalyst, which can recover or reuse the chiral salen metal catalyst. CONSTITUTION: The chiral compound is produced by using the enantioselective ring-opening reaction of epoxides in the presence of a salt represented by the formula 1 and the chiral salen metal catalyst represented by the formula 3. In the formula 1, when X is nitrogen, Z is -C(R5)-, R1 and R2 are each C1-C18 alkyl, R3-R5 are each hydrogen or C1-C18 alkyl and when X is carbon, Z is -C(R5)-C(R6)-, R1 is C1-C18 alkyl, R2-R6 are each hydrogen or C1-C18 alkyl, n is an integer of 1-3, and Y- is an anion capable of forming a salt. In the formula 3, R1-R4 are independently hydrogen, alkyl, carboxyl, aryl, and substituted aryl, X1-X8 are independently hydrogen, halogen, alkyl, silyl, silyloxy, alkenyl, and etc., Y1 and Y2 are each hydrogen and alkyl, M is a metal, and A is an anion.
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: The trifluoromethylketone derivatives supported on silica gel and a producing method thereof are provided to be used as a useful catalyst in the epoxidation reaction using olefin and Oxone oxidizing agent. CONSTITUTION: The trifluoromethylketone derivatives are represented by formula (3), in which R1 is C1 to C6 alkyl, R2, R3 and R4 are individually hydrogen or C1 to C6 alkyl, I is an integer from 0 to 1, m is methylene from 1 to 6, n is an integer from 0 to 2, and O is methylene from 0 to 16. The trifluoromethylketone derivatives of formula (3) supported on silica gel are produced by reacting trifluoromethylketone derivatives of formula (1) with mercaptoalkylsilanized silica gel of formula (2) in the presence of organic solvents such as azobisisobutyronitrile, benzene, toluene, acetonitrile or chloroform.
Abstract:
PURPOSE: A process for preparing an optical active aminoalcohol compound using a cinchona alkaloid catalyst having excellent catalytic performance, reusable and excellent in thermal, mechanical stability, a nitrogen source and a base is provided which carries out the heterogeneous asymmetric aminohydroxylation of olefins economically and can improve processing difficulties by high toxicity and volatility of OsO4. CONSTITUTION: In the process for manufacturing an optical active aminoalcohol compound by heterogeneous asymmetric aminohydroxylation of olefins, the process uses a catalytic system containing conventional cinchona alkaloids of formula 1 and a nitrogen source and a base. In formula, Y is hydroquinidinyl represented by formula 2 or hydroquinidinyl represented by formula 3, X represents an unsaturated compound containing 0 or 4 carbons, pyridazine in case X is 0 and phthalazine in case X is an unsaturated compound, R represents methoxy, ethoxy or methyl.
Abstract:
본 발명은 광학적으로 순수한 다음 일반식(I)로 표시되는 비스(오르토-디아릴포스피노페닐)-테트라히드로-비(1,3-옥사졸) 화합물 및 이의 제조방법에 관한 것으로서, 일반식(I)의 화합물은 다시, 일반식(Ia)로 표시되는 (4S, 4'S)-2,2'-비스(오르토-디아릴포스피노페닐)-4,4',5,5'-테트라히드로-4,4'-비(1,3-옥사졸) 화합물과 이의 거울상 이성체인 일반식(Ib)로 표시되는 (4R,4'R)-2,2'-비스(오르토-디아릴포스피노페닐)-4,4',5,5'-테트라히드로-4,4'-비(1,3-옥사졸)을 포함한다. 본 발명의 화합물은 비대칭 히드로실릴화 반응, 수소화 반응, 시클로프로판화 반응, 알킬화반응 등에 유용하게 사용될 수 있다.
Abstract:
본 발명은 화학식 3으로 표시되는 실리카겔 지지체에 결합된 비스-신코나알칼로이드 유도체, 그의 제조방법 및 용도에 관한 것이다. 본 발명에 따른 화학식 3의 실리카겔 지지체에 결합된 비스-신코나알칼로이드 유도체는 올레핀 화합물로부터 비대칭 이수산화 반응(asymmetric dihydroxylation)을 이용하여 이웃한 디올(vicinal diols)을 제조하는데 유용한 촉매로서, 재사용이 가능하다. [화학식 3]
(식 중, Y는 퀴니닐 또는 퀴니디닐이고; X는 부재하거나 또는 탄소수 4개의 불포화 고리 화합물을 표시하는데, X가 부재하는 경우에는 그가 결합된 복소환 화합물이 피리다진이되고, X가 탄소수 4개의 불포화 화합물인 경우에는 그가 결합된 복소환 화합물은 프탈라진이 되며; R은 메톡시, 에톡시 또는 메틸기를 나타냄)
Abstract:
본 발명은 출발물질로서 다음 구조식(Ⅱ)의 (R)-4(트리클로로메틸)옥세탄-2-온을 산 촉매하에 C 1 -C 18 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.
상기식에서 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:
A method for the separation of a recemic mixture of alpha- haloalkanoic acid comprises reacting a metal salt of a cpd. of formula (II) with a cpd. of formula (III) to obtain a pair of diastereoisomers of formula (IV), separating the diastereoisomers by column chromatography, esterifying the obtd. cpd., and reducing the optically pure cpd. of formula (V). In the formulas, R=C1-10 alkyl or C6-12 aryl; X=Cl, Br or I; R1=C1-10 alkyl or C6-12 aryl; R2=H, C1-10 alkyl or C6-12 aryl. The optically pure alpha- haloalkanoic acids are useful as intermediates in the mfr. of medicines or agricultural chemicals.
Abstract:
A liquid form fire extinguishing compsn. comprises C1-5 halogenated alkane or their mixture and organic phosphorus cpds. or their mixture. Pref. C1-5 halogenoalkane is bromochloro difluoromethane, bromotrifluoromethane, dibromo difluoromethane, dichloro difluoromethane, trichlorofluoromethane, bromochloromethane, bromomethane, tetrachloromethane, chloropent fluoroethane, 1,2-dibromo tetrafluoroethane, 1,2-dibromoethane, etc.; the organic phosphorus cpd. is a cpd. of formula (I) or (II). In the formulas, E=O or S; k,l,m and n = 0 or 1; R1, R2 and R3=C1-18 alkyl, halogen or amino substd. C1-18 alkyl, C6-12 aryl, etc.; X=H or halogen.