Abstract:
Quinoline derivs. of formula (I) and their pharmaceutically acceptable salts are prepd. by condensing a tetrahydropyridine deriv. of formula (II) and a quinoline carboxylic acid deriv. of formula (III) at 200 deg.C for 1-10 hr(s) in the presence (or absence) of a solvent, and in the presence of a base. In the formulas, R1= ethyl, cyclopropyl or 2,4-difluorophenyl; R2 and R3=H, F or amino; R4 and R5=H, C1-3 alkyl, C1-3 alkyl substd. N- alkylhydroxyamino or N-alkoxy- N-alkylamino; R6=H or C1-3 lower alkyl; X=N, methyne, fluoromethyne or ethyne. Cpds. (I) are useful as an antibacterial agent.
Abstract:
Benzoxazine derivs. of formula (I) and their pharmaceutically acceptable acid addn. salts are new. In (I), R1 and R2 each = H or lower alkyl; n = 1 or 2. Also clainned is the prepn. of (I) which comprises reacting a benzoxazine carboxylic acid deriv. of formula (II) with a cpd. of formula (III) at room temp. -200 deg.C for 1- 10 hr(s). In (II), X= halogen. The cpds. (I) have a good antibacterial activity, a broad spectrum activity, low toxicity and high bioavailability.
Abstract:
PURPOSE: A novel method for economically manufacturing naphthopyran based photochromic dye of high yield and high purity is provided. CONSTITUTION: A method for manufacturing naphthopyran based photochromic dye of chemical formula 1 comprises: a step of reacting amino naphtholic acid with alkyl- or benzyl-chloroformate to obtain a compound of chemical formula 4; a step of substituting the compound of chemical formula 4 with amine compound to obtain a compound of chemical formula 2; a step of reacting halogen-substituted benzo phenone with nucleophilic compound under the presence of base and reacting with sodium acetylide to obtain a compound of chemical formula 3; and a step of reacting the compound of chemical formula 3 with a compound of chemical formula 2.
Abstract:
본 발명은 고지혈증 치료제인 아토르바스타틴을 제조하기 위한 핵심 중간체인, 질소가 이중치환된 7-아미노-3,5-디하이드록시 헵탄산 유도체의 제조방법에 관한 것으로, 질소를 이중 보호시킨 케토에스테르를 고압 수소화 반응시키는 것을 포함하는 본 발명의 방법에 의하면, 화학식 2로 표시되는 질소가 이중치환된 7-아미노-3,5-디하이드록시 헵탄산 유도체를 종래의 방법에 비해 온화한 조건하에서 간편하게 고수율로 합성할 수 있다.
Abstract:
PURPOSE: Provided is a method of preparing 7-amino-3,5-dihydroxyheptanoic acid derivatives with disubstituted nitrogen, an intermediate for producing atorvastatin (Liptor) as a medical treatment for hyperlipemia, which is inhibitor of HMG-CoA reductase and ACAT. CONSTITUTION: The preparation method comprises: (A) performing high pressure hydrogenation of the compound of formula 3 in the presence of Ru catalyst at room temperature-100deg.C under 30-100atm to produce the compound of formula 4; (B) reacting compound of formula 4 with the compound of formula 5 to produce the compound of formula 6; and (C) carrying out high pressure hydrogenation of compound of formula 6 in the presence of Ru catalyst at room temperature-100deg.C under 30-100atm or stereoselective hydrogenation using diethylmethoxy borane or sodium borohydride. In the formula, R is C1-6 alkyl; P and P1 are independently benzyl, benzyloxycarbonyl, C1-6 alkyloxycarbonyl, benzoyl or acetyl.