Abstract:
본 발명은 C2 및 C6 위치에 시스 치환기가 있는 테트라하이드로파이란 유도체와 이의 제조방법에 관한 것이다. 더욱 상세하게는 본 발명은 호모프로파질릭알콜 유도체와 알데하이드 화합물을 트리메틸실릴트리플레이트 존재 하에서 프린스 반응시켜 R 3 =메틸라이덴에틸트라이플레이트기인 하기 화학식 1로 표시되는 화합물을 제조하는 과정, 또는 R 3 =메틸라이덴에틸트라이플레이트기인 하기 화학식 1로 표시되는 화합물을 가수분해 반응시켜 R 3 =아세틸기인 하기 화학식 1로 표시되는 화합물을 제조하는 과정을 수행하여 제조된 신규 화합물로서, 신규 화합물의 테트라하이드로파이란 고리의 C2 및 C6 위치에는 시스 치환기가 동시에 존재하므로 기능성 천연물 합성용 중간체로도 유용한 하기 화학식 1로 표시되는 신규의 테트라하이드로파이란 유도체와 이의 제조방법에 관한 것이다.
상기 화학식 1에서, R 1 , R 2 , R 3 은 각각 발명의 상세한 설명에서 정의한 바와 같다. 다이하이드로파이란-3-일라이덴에틸트리플레이트, 테트라하이드로-2H-파이란-3-일에탄온, 프린스 반응
Abstract:
PURPOSE: Methods for preparing tetrasubstitued pyrazines using baker's yeast are provided, thereby easily and environment-friendly preparing tetrasubstitued pyrazines in water under mild condition. CONSTITUTION: The method for preparing tetrasubstitued pyrazines of formula (2) using baker's yeast comprises the steps of: (1) preparing a solution of baker's yeast; and (2) dissolving beta-keto alpha-oxime carbonyl derivatives of formula (1) in hydrophilic organic solvent and adding the solution into the baker's yeast solution to carry out chemoselective microbial reduction, wherein R1 is methyl, ethyl or phenyl; R2 is hydrogen, methyl or benzyl; R3 is methoxy, ethoxy, benzyloxy or phenylamine; the organic solvent is selected from benzene, toluene and hexane.
Abstract:
PURPOSE: Isoxazole or isoxazoline substituted 1,2,5,6-tetrahydropyridine derivative having high affinity for an acetylcholine receiptor is provided, which compound is useful as a muscarine type acetylcholine receiptor agonist, a recognition improving agent and a treating agent of cerebral nervous disease such as Alzheimer's disease. CONSTITUTION: The isoxazole or isoxazoline substituted 1,2,5,6-tetrahydropyridine derivative represented by formula(1) and a pharmaceutically acceptable salt thereof are provided, wherein R2 is C1-4 alkyl; one of R3 and R4 is one functional group in claim 1 and another of them is H; R5 is hydrogen, hydroxy, hydroxy C1-6 alkyl, C1-6 alkoxymethyl, C1-6 alkoxy, acetoxy, C1-4 alkyl ester, nitrile, aryl, phenylthio, methylthiomethyl, phenylsulfoxide, dimethylthiomethyl, C1-4 alkylketo, C1-4 alkylketo oxime, C1-4 alkylketo C1-5 alkyl oxime, and N-pyrrolidine-2-on; R6 is hydrogen; and R5 and F6 form -CH2OCH2 together. The process for preparing the isoxazole or isoxazoline substituted 1,2,5,6-tetrahydropyridine derivative represented by formula comprises the steps of: reacting 3- or 4-pyridine aldehyde oxime compound of formula(2) with chlorox to prepare nitrile oxide of formula(4); and cycloadddition reaction of nitrile oxide of formula(4) with alkene or alkyne compound of formula(8) or formula(9) to prepare a compound of formula(5) or formula(6); reacting the compound of formula(5) or formula(6) with alkyl iodide to prepare alkyl pyridine salt of formula(7); and reducing the alkyl pyridine salt of formula(7).
Abstract:
Novel pyrazolopyrimidinethione compounds of formula 1: wherein R1 and R2 are independently each hydrogen atom, a C1-C6 alkyl group, or a C3-C6 cycloalkyl group, R3 is a C1-C6 alkyl group. C3-C6 cycloalkyl group or C3-C6 alkenyl group which is substituted or unsubstituted, X is O or NR4, and R4 is hydrogen atom, or a C1-C6 alkyl group, a C3-C6 cycloalkyl group or a C3-C6 alkenyl group which is unsubstituted or substituted with OH or an alkoxy group, pharmacologically acceptable salts or hydrates thereof, and preparation methods thereof are disclosed. Pharmaceutical compositions comprising the compounds are effectively used for the treatment of erectile dysfunction.
Abstract:
본 발명은 인듐 금속을 이용하여 니트로기(-NO 2 )를 갖는 화합물을 아민(-NH 2 ) 화합물로 환원시키는 방법을 제공한다. 보다 구체적으로는 인듐 금속을 이용하여 화학식 1을 갖는 지방족 또는 방향족 화합물을 화학식 2의 화합물로 환원시키는 방법을 제공한다. [화학식 1]
[화학식 2]
상기 화학식 1 및 2에서, R은 지방족 또는 방향족 화합물을 나타내며, n은 1-5의 정수, 바람직하게는 1-3의 정수, 가장 바람직하게는 1 또는 2이다. 인듐 금속을 이용한 본 발명의 환원 반응은 상온에서 짧은 시간 내에 진행될 뿐만 아니라 수개의 니트로기를 짧은 시간 내에 한번에 환원시킬 수 있다. 또한 분자내 다른 관능기에 영향을 미치지 아니하고 니트로기만 선택적으로 환원시킬 수 있으며, 수용액 상에서 반응이 쉽게 진행되므로 환경친화적 산업 공정이다는 장점을 가지고 있다. 따라서 화학 공업 분야에서 다양하게 응용될 수 있다.
Abstract:
PURPOSE: Provided is a method for preparing allylated 7-hydroxycoumarin derivatives effectively and economically in high yield. CONSTITUTION: The method for preparing allylated 7-hydroxycoumarin is characterized by reacting allylhalide of the formula(1) with 7-hydroxycoumarin of the formula(2) to manufacture allylated 7-hydroxycoumarin derivative of the formula(3).
Abstract:
PURPOSE: A method for preparing an allyl aromatic compound and a pyranocoumarin derivative are provided, to use an indium metal catalyst which is stable in water and atmosphere, environment-friendly and recyclable and MMPP or hydrogen peroxide as an oxidizing agent which is cheap, for the economical efficiency. CONSTITUTION: The allyl aromatic compound of the formula 3 is prepared by reacting the allyl halogen compound of the formula 1 with the aromatic compound of the formula 2 in the presence of an indium metal catalyst. The allyl aromatic compound of the formula 5 is prepared by reacting the allyl halogen compound of the formula 1 with the aromatic compound of the formula 4 in the presence of an indium metal catalyst. The decursinol of the formula 6 is prepared by the oxidation cyclization of the allyl aromatic compound of the formula 5 and magnesium monoperoxyphthalate hexahydrate(MMPP) or hydrogen peroxide. In the formulas 1, 2, 3, 4, 5 and 6, X is a halogen atom; R1 and R2 are independent each other and are H or a straight of branched hydrocarbon group of C1-C5; R3 is H or OH; and R4 is H, a methyl group or a phenyl group. Preferably an acid catalyst is added further in the case of MMPP used, and a phase transfer catalyst is added further in the case of hydrogen peroxide used.