Abstract:
본 발명은 레복세틴 부분입체이성질체 유도체의 신규한 제조방법에 관한 것이다. 본 발명에 의한 제조방법으로 제조된 레복세틴 부분입체이성질체 유도체는 수율이 매우 우수하고, 제조과정이 간단할 뿐만 아니라, 특히, 하이드록시기가 보호된 신나밀알코올에 비대칭 다이히드록시화 반응을 수행함으로써, 산소 작용기를 입체선택적으로 도입한 후, 상기 다이올(diol)을 사이클릭 설페이트의 형태로 변형시킨 후, 상기 다이올을 동시에 활성화하며, 보호기로 보호된 하이드록시기의 탈보호 과정으로 유발되는 사이클릭 설페이트 재배열반응(cyclic sulfate rearrangement)이 일어남으로써, 친핵성 치환반응이 가능해지고, 이때, 지금까지 보고되지 않은 신규의 에폭시 생성반응이 동반될 뿐만 아니라, 이 과정에서 다른 워크업 과정없이 동일 반응용기(one pot)에서 다음반응을 수행할 수 있어 반응 단계가 줄어들어 합성시간이 짧아 매우 효율적으로 레복세틴 부분입체이성질체 유도체를 제조할 수 있고, 또한, 레복세틴은 세로토닌 노르에피네프린 재흡수 억제 효과가 있으므로 이의 부분입체이성질체인 본 발명에 따른 레복세틴 부분입체이성질체 유도체는 우울증 및 주의력 결핍 및 과잉행동장애(ADHD) 예방 또는 치료용 약학적 조성물로 유용하게 사용될 수 있다.
Abstract:
The present invention provides xylosidase having amino acid sequence described in second sequence in a sequence listing. More specifically, the xylosidase of the present invention has heat resistance and alkali resistance. The xylosidase reduces wastes and expensive purification costs by replacing conventional chemical methods, and can be used for manufacturing raw materials such as substitute raw materials for fuel, special functional materials, bio polymers, and the likes by being utilized in a saccharification process of fiber based biomass, in forage industries, and paper and detergent industries by showing excellent xylene decomposition activities.
Abstract:
The present invention relates to a method for preparing cellulose derivatives from biomass comprising the following steps: treating room temperature ionic liquid with biomass including cellulose, hemi-cellulose and lignin, and dissolving the cellulose; removing the room temperature ionic liquid and recrystallizing the cellulose; and making a functional-group-introducing agent to contact with the recrystallized cellulose, and introducing a functional group to the cellulose in order to obtain cellulose derivatives. The present invention excludes effects of foreign substances and excessive decomposition products generated in existing pre-processing steps, reduces costs, prevents environmental contamination by simplifying processes and recycling the room temperature ionic liquid, concurrently obtains various cellulose derivatives and saves energy consumed for pre-processing by processing the steps at the room temperature.
Abstract:
PURPOSE: A method for preparing [1,2,3]-oxathiazolidine-2,2-dioxide or derivative thereof is provided to simply and efficiently obtain the enantiomerically pure compounds. CONSTITUTION: A method for preparing a compound of chemical formula 1a or 1b with optical activity comprises a step of performing asymmetric reduction of a compound of chemical formula 2 under the presence of a hydrogen donor and a rhodium compound catalyst containing pentamethylcyclopentadienyl group. The hydrogen donor is formic acid, metal salt thereof of. The compound of chemical formula 2 is prepared by reacting alpha-hydroxy ketone of chemical formula 4 with sulfamide of chemical formula 5 by thermal reflux or under an acidic condition.
Abstract:
본 발명은 신규한 2차원 그라펜 나노리본(Two-dimensional graphene nanoribbons) 및 이의 제조방법에 관한 것이다. 자세하게는 유기합성적 제조방법을 이용한 고품질의 그라펜 소재 및 그라펜의 에지(Edge)에 기능성 유기 치환체의 결합을 통하여 기능 제어된 그라펜 나노리본 및 이의 제조방법을 제공한다. 본 발명에 따라 제조된 그라펜 나노리본은 길이가 20 내지 80 nm이고, 폭이 약 2.5 nm이며, 두께가 약 0.16 내지 0.17nm의 2차원 구조를 갖는 것이 특징이다.
Abstract:
PURPOSE: A method for preparing optically active 2-sulfonyl oxy-1-heteroaryl ethanol derivative is provided to prepare pure bufuralol of optical isomer. CONSTITUTION: A 2-sulfony oxy-1-heteroaryl ethanol derivative is prepared by asymmetric reduction of alpha-sulfonyl oxy hetero aryl ketone compound of chemical formula 3 under the presence of hydrogen donor and rhodium compound catalyst containing pentamethyl cyclopentadienyl group of chemical formula 4. The hydrogen donor is formic acid or metal salt or ammonium salt thereof. The hydrogen donor is used without a solvent or is dissolved in a solvent. The solvent is ethyl acetate, toluene, methylene chloride, dimethylform amide(DMF), tetrahydrofurane(THF), acetonitrile or isopropanol. A pure bufuralol is prepared by reacting the optically active 2-sulfonyl oxy-1-heteroaryl ethanol derivative compound of chemical formula 1c or 1d with t-butyl amine.
Abstract:
PURPOSE: A method of preparing oxazolidine-2-one compound is provided to apply in industry through single process with same reaction group. CONSTITUTION: A method for preparing an oxazolidin-2-one compound comprises: a step of reacting diol initiator with isocyanide dichloride to prepare cyclic iminocarbonate; and a step of performing rearrangement of the cyclic iminocarbonate with halogenation nucleophile to produce the oxazolidin-2-one function group.
Abstract:
PURPOSE: A method for preparing atomoxetine and (R)-nisoxetine is provided to efficiently prepare atomoxetine and (R)-nisoxetine with high optical activity through asymmetric hydrogenation transfer reaction. CONSTITUTION: A method for preparing atomoxetine and (R)-nisoxetine comprises the steps of: preparing a compound of the chemical formula 4 by reducing a compound of the chemical formula 3 through asymmetric transfer hydrogenation in the presence of a catalyst and hydrogen donor; preparing a compound of the chemical formula 5 by reacting the compound of the chemical formula 4 with a nitrile compound; preparing a compound of the chemical formula 6 by reducing the compound of the chemical formula 5 in the presence of BH3; preparing a compound of the chemical formula 7 by introducing a t-butoxycarbonyl group as a blocking group to an amine group of the compound of the chemical formula 6; prep aring a compound of the chemical formula 8 from the compound of the chemical formula 7 using Mitsunobu reaction; preparing a compound of the chemical formula 9 by introducing a methyl group to the compound of the chemical formula 8 in the presence of a base; and deprotecting the compound of the chemical formula 9 in the presence of an acid.
Abstract:
본 발명은 활성 성분으로서 하기 화학식 1의 피라졸옥심 유도체를 포함하는 항암제 조성물에 관한 것이다. 본 발명의 조성물에 사용된 화학식 1의 피라졸옥심 유도체는 합성 방법이 매우 간단할 뿐 아니라, 폐암, 난소암, 흑색종, 중추신경계 종양 또는 결장암 등의 각종 암에 뛰어난 항암 활성을 보이므로, 그의 예방 및 치료에 사용될 수 있다:
상기 식에서, R은, 질소함유 헤테로 고리, 치환되거나 치환되지 않은 페녹시, 페닐티오, 하이드록시, 아미노, 알킬아미노 또는 할로겐이다.