Abstract:
키랄성알코올화합물의제조방법이개시된다. 키랄성알코올화합물을제조하기위하여키랄촉매화합물의존재하에라세믹알코올화합물또는메조알코올화합물과실릴화제를입체선택적으로반응시킬수 있고, 이경우키랄촉매화합물로는염기부분인올리고에틸렌글라이콜작용기와산성부분인바이놀유도체의하이드록시작용기를포함하는올리고에틸렌글라이콜이유도체화된화합물을사용할수 있다.
Abstract:
PURPOSE: A method for preparing chiral amino acid ester having high stereoselectivity is provided to economically and simply produce N-acyl amino acid ester of highly optical selectivity. CONSTITUTION: A bifunctional organic chiral catalyst compound is denoted by chemical formula 1. A method for preparing the bifunctional chiral organic catalyst comprises a step of reacting amine with 3,4-alkoxy-3-cyclobutene-1,2-dione derivative. A chiral N-acyl amino acid ester is prepared from azlactone by reacting racemic azlactone, (S)-azlactone or (R)-azlactoen with nucleophile under the presence of organic solvent.
Abstract:
PURPOSE: A method for synthesizing bifunctional cinchona alkaloid catalyst is provided to ensure low toxicity, and chemical stability, and synthesize chiral hemiester having various structures in a short time. CONSTITUTION: A bifunctional cinchona alkaloid catalyst is denoted by chemical formula 1 or 2. A chiral hemiester is produced by reacting a prochiral or meso-cyclic acid anhydride with nucleophile in organic solvent under the presence of the bifunctional cinchona alkaloid catalyst. The nucleophile is alcohol or thiol. The organic solvent is dimethoxyethane, ethylvinyl ether, methyl t-butyl ether, diethyl ether, diisopropyl ether, tetra hydro furan or dioxane.
Abstract:
A hydrogenation method of aromatic compounds is provided to hydrogenate an aromatic compound in a condition of normal temperature and atmospheric pressure, to ensure fast reaction rate, to reduce side reactions and used amount of the metal catalyst. A hydrogenation method of aromatic compounds comprises the steps of: (i) putting an ionic salt Lewis acid catalyst of chemical formula 1: [A^+][M_(m+n)X_(x+y)^-], metal and a support catalyst in an aromatic compound and then stirring the materials under a hydrogen gas atmosphere; (ii) separating and organic layer containing a hydrogenated aromatic compound and an aqueous layer by adding an organic solvent to the product; and (iii) evaporating solvent by drying the separated materials. In chemical formula 1, A is an organic cation from an organic salt; and [M_(m+n)X_(x+y)^-] is an anion capable of forming salts with A.
Abstract:
PURPOSE: A fabricating method of an organic fluoro compound with the high yield, and a manufacturing method of a nucleophilic displacement product are provided to improve the speed of the displacement reaction using a bi-functional compound as a solvent. CONSTITUTION: A manufacturing method of a nucleophilic displacement product comprises a step of reacting alkyl halide or alkyl sulfonate, with metal salt or ammonium salt inside an organic solvent. The organic solvent is a bi-functional compound marked with chemical formula 1. In the chemical formula 1, R1, R2, and R3 are hydrogen or a C1~C10 alkyl group. The metal salt is selected from the group consisting of lithium salt, sodium salt, potassium salt, rubidium, and cesium salt.
Abstract:
PURPOSE: A method for preparing chiral hemiesters through asymmetric ring opening reaction of meso-cyclic anhydrides is provided to ensure high value of industrial use and to reuse it by a basic acid-base distillation method. CONSTITUTION: A method for preparing chiral hemiesters through asymmetric ring opening reaction of meso-cyclic anhydrides comprises a step for reacting meso-cyclic anhydride with alcohol by using organic catalysts represented by chemical formula 1 or chemical formula 2 in the presence of an organic solvent. In the formulae, X is O or S and R is ethyl or vinyl. The chemical formula 1 has dihydro quinine or quinine as a starting material. The chemical formula 2 has dihydro quinine or quinine as a starting material.
Abstract:
키랄성알코올화합물의제조방법이개시된다. 키랄성알코올화합물을제조하기위하여키랄촉매화합물의존재하에라세믹알코올화합물또는메조알코올화합물과실릴화제를입체선택적으로반응시킬수 있고, 이경우키랄촉매화합물로는염기부분인올리고에틸렌글라이콜작용기와산성부분인바이놀유도체의하이드록시작용기를포함하는올리고에틸렌글라이콜이유도체화된화합물을사용할수 있다.
Abstract:
본 발명은 라세믹 또는 키랄 아즈락톤으로부터 높은 입체선택성을 갖는 키랄 아미노산 에스터를 수득하는 방법을 제공하며, 여기에 사용되는 유도체화된 이작용성 유기 키랄 촉매 화합물과 그의 제조방법을 제공한다. 현재까지 알려진 제조방법에 따르면, 높은 거울상 입체 선택성을 가지는 N- 아실 아미노산 에스터를 얻기 위하여 저온에서 장시간 반응을 수행해야 한다는 문제점이 있을뿐만 아니라, 수득되는 화합물의 광학 선택성 또한 공업화에 적용시키기에 부족하였다. 본 발명에 따른 촉매 화합물은 신코나 알칼로이드로부터 쉽게 합성이 가능하며, 매우 경제적이며 간편한 방법으로 높은 광학선택성을 갖는 N-아실 아미노산 에스터를 수득할 수 있을 뿐 아니라 자연에 존재하지 않는 (R)-형태의 다양한 N-아실 아미노산 에스터도 높은 광학 순도로 제조할 수 있어 공업화에 유용한 기술로 활용될 것이 예상된다.
Abstract:
PURPOSE: A bifunctional bis-cinchona alkaloid thiourea organic chiral catalyst compound and a method for preparing the same are provided to obtain (R)-type N-acyl amino acid ester of highly optical purity. CONSTITUTION: A bifunctional bis-cinchona alkaloid thiourea organic chiral catalyst compound is denoted by chemical formula 1. In chemical formula 1, R is ethyl group or -CH=CH_2. The bifunctional organic chiral catalyst is obtained by reacting amine with carbothio diimidazole. The amine is obtained from cinchona alkaloid by epimerization. A chiral N-acyl amino acid ester is obtained by reacting N-acyl amino acid, racemic azlactone, (S)-azlactone or (R)-azlactone with neucleophile under the presence of bifunctional chiral organic catalyst. The neucleophile is alcohol or thiol.