Abstract:
Chiral bisphosphine bearing imidazolium salt, their intermediates and a preparation method thereof are provided, which chiral bisphosphine forms chiral metal complex with transition metal ion, has high reactivity during asymmetric hydrogen reaction in ionic liquid, and improved photo-selectivity and conversion rate, and easily isolated and recovered after reaction. The chiral bisphosphine bearing imidazolium salt represented by formula (1) is provided, wherein n is an integer of 1 to 10; R1, R2, R3 and R4 are independently hydrogen, C1-C10 alkyl, C3-C8 cyclic alkyl, aryl or substituted aryl in which the substituent is halogen, C1-C6 alkyl or C1-C6 alkoxy; Z is phenyl or substituted aryl in which the substituent is halogen, C1-C6 alkyl or C1-C6 alkoxy; and X is BF4, PF6, SbF6, OTf or NTf2. The intermediates of the chiral bisphosphine bearing imidazolium salt represented by formula (1) are represented by formula (2), formula (3), formula (4), formula (5) and formula (6), respectively, wherein Y2 is halogen, methane sulfonyl or para-toluenesulfonyl.
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:
PURPOSE: A triazole derivative is provided to be used as a restorative of mitochondrial dysfunction with effects of treating Alzheimer's diseases, Parkinson's disease, Huntington's disease, ischemic diseases, diabetes, and schizophrenia. CONSTITUTION: A compound is selected among a triazole derivative of chemical formula 1and a pharmaceutically acceptable salt thereof. A pharmaceutical composition for treating Alzheimer's disease, Parkinson's disease, Huntington's disease, ischemic disease, diabetes, and schizophrenia contains the compound as an active ingredient. A method for preparing the triazole compound comprises the step of reacting an azide compound of chemical formula 2 and an ethynyl benzene compound of chemical formula 3 by dipolar cycloaddition.
Abstract:
PURPOSE: Aryloxime derivatives are provided to show excellent activity as a neuroprotective agent acting on mitochondria, therefore, to be useful as a treatment and prevention agent of diseases such as Alzheimer disease, Parkinson's disease, Huntington disease, ischemic disease, diabetes, and schizophrenia. CONSTITUTION: A chemical is selected from aryloxime derivatives represented by Chemical formula 1, and pharmaceutically acceptable salt thereof. In the chemical formula 1; R^1 represents a 4-8 membered azacyclic group or a 7-9 membered azabicylic group, and the azacyclic or azabicyclic group is able to be substituted with 1-3 substituents selected from C1-6 alkyl and benzyl, or be non-substituted; R^2 and R^3 respectively represent a hydrogen group, a halogen group, a C1-C6 alkyl group, a C1-C6 haloalkyl group, or a C1-C6 alkoxy group; and n is an integer of 0, 1, 2 or 3.