Abstract:
PURPOSE: A method for allylating an aldehyde group and reducing a nitro group simultaneously by using indium and an acid is provided, to obtain the compound of the formula 3 with high yield and rapidly at a low temperature. CONSTITUTION: The method comprises the steps of reacting the compound of the formula 1 with the compound of the formula 2 in the presence of indium and an acid to obtain the compound of the formula 3 by the allylation of an aldehyde group and the reduction of a nitro group, wherein R is an aromatic cycle of C6-C10; R1, R2 and R3 are independent one another and are H, an alkyl group of C1-C6, a phenyl group or an alkoxycarbonyl group of C1-C3; k is an integer of 0-4; Y's are a halogen atom, an alkyl group of C1-C3 substituted with halogen or unsubstituted, or an alkoxy group of C1-C3 substituted with halogen or unsubstituted, and two Y's combine to from a five- or six-membered ring or a five- or six-membered heterocycle; m is integer of 1-3; n is an integer of 1-3; and X is Cl, Br or I. Preferably the acid is a strong acid comprising HCl, HBr, HI, sulfuric acid, nitric acid and trifluoroacetic acid. Preferably the reaction is carried out in a polar solvent.
Abstract:
PURPOSE: The piperazinylethyl triazole derivatives and a producing method thereof are provided, thereby the piperazinylethyl triazole compounds can be produced in higher yield and purity. CONSTITUTION: The piperazinylethyl triazole derivatives are represented by formula (1), in which R1 is C6 to C10 aromatics, C6 to C10 aromatic carbohydrate substituted with C1 to C6 alkyl, C6 to C10 aromatic carbohydrate substituted with C1 to C4 alkoxy, C6 to C10 aromatic carbohydrate substituted with halogen or C7 to C10 arylalkyl; R2 to R5 are independently hydrogen, halogen, methyl or ethyl; R6 to R7 are independently hydrogen, phenoxy substituted with halogen, -OC(O)R8 or -NR9R10; Y is O or S; R8 is C1 to C6 alkyl; R9 and R10 is independently C1 to C6 alkyl; R11 is hydrogen, C1 to C6 alkyl or phenyl; R12 is independently hydrogen or C1 to C6 alkyl; n is an integer of 1 or 2; k is 5 or 6 when n is 1 or 2, respectively; and m is 4 or 5 when n is 1 or 2, respectively. The piperazinylethyl triazole derivatives is produced by separation and purification using acid.
Abstract:
PURPOSE: A novel tertiary aminoethyl isooxazol derivative is provided, which acts as an antagonist of dopamine-1 receptor relating to various central nervous system disorders. And a method for preparing the same is also provided. CONSTITUTION: The tertiary aminoethyl isooxazol derivative is represented by the formula (1) and is prepared by dissolving a compound represented by the formula (2) and a compound represented by the formula (3) in a solvent to react them with each other in the presence of base. In the formulae 1-3, R1 is phenyl, phenyl substituted by halogen atom, phenyl substituted by trifluoromethyl, phenyl methyl having a trifluoromethyl substituent in 2, 3 or 4 position of the phenyl group, diphenylmethyl having a halogen atom substituent in 2, 3 or 4 position of the phenyl group, benzyl or 3-hydrobenzimidazole-2-one, each R2-R5 is hydrogen, R6 is phenyl substituted by at least one selected from the group consisting of nitro group, phynoxy group, methoxy group, trifluoromethyl group and halogen group, vinyl substituted by phenyl group or C5 or C6 unsaturated or saturated hetero cyclic compound substituted by O, S or N, and X is nitrogen or carbon.
Abstract:
PURPOSE: Provided is a novel isooxazol piperazin derivative which is used as an antagonist against dopamine-1 receptor related to the central nerve system disorders. CONSTITUTION: A novel isooxazol piperazin derivative represented by the formula (1) is manufactured by reacting secondary amine of the formula (2) with aldehyde of the formula (3) in the presence of NaBh(OAc)3, NaBH3CN, or NaBH4 as a reductant and methylene chloride as a solvent at room temperature for 3-24 hours, preferably 12-14 hours. In the formula (1), n is an integer of between 1 and 4; R1 is a phenyl group at an ortho, meta, or para position substituted by more than one group among halogen, trifluoromethyl, -NO2, alkyl group of C1-C3 , and alkoxy group of C1-C3, or an alkyl group of C1-C3, hydroxy group, 4-(2-keto-1-benzimidazolerynyl), 1-(2-(trifluoromethyl)benzene, 4-(4-chlorophenyl)-4-hydroxy, 1-(2-pyrimidyl), or 1-benzyl group; R2-R5 is hydrogen; R6 is a phenyl group at an ortho, meta, or para position substituted by more than one group among halogen group, trifluoromethyl group , -CN, -NO2, an alkyl group of C1-C3, phenoxy group, and alkoxy group of C1-C3 and an unsaturated 5 or 6 hetero ring group having more than one atom from an alkyl group of C-C3, alkoxy group of C1-C3, thiophenyl group, (2-phenyl)vinyl group, pyridyl group, and from oxygen, sulfur, and nitrogen; and Q is isoxazol (A) or 4,5-dihydroisoxazole derivative (B).
Abstract:
The present invention relates to a novel isoxazolylalkylpiperazine derivatives having selective biological activity at dopamine D3 or D4 receptors represented by the following formula (1), and its preparation method through reductive amination reaction in the presence of reducing agent, wherein R1, R2, R3, R4, R5, R6, X and n are the same as defined in the specification.
Abstract:
PURPOSE: Quinolone derivatives and a preparation process thereof are provided, thereby cheaply preparing quinolone derivatives under mild conditions. CONSTITUTION: Quinolone derivatives are represented by the formula 6, wherein R is H, or halogen selected from Cl, F, Br and I; R1 and R2 are independently H, alkyl or OH; and Y is -Ts(tosyl), -Ms(mesyl) or -Ac(acetyl). A process for preparing the quinolone derivatives of the formula 6 comprises the steps of: reacting a compound of the formula 1 with a compound of the formula 2 in the presence of indium metal and acid to simultaneously perform allylation of aldehyde and reduction of nitro group, thereby preparing a compound of the formula 3; protecting amine group of the compound of the formula 3 to prepare a compound of the formula 4; oxidizing secondary alcohol of the compound of the formula 4 to prepare a compound of the formula 5; and cyclization of the compound of the formula 5 in the presence of organic base, wherein the oxidation of secondary alcohol uses pyridinium chlorochromate(PCC) or pyridinium dichromate(PDC) or Swern's oxidation or Dess-Martin periodinane oxidation; and the organic base is diisopropylethylamine, DBU (1,8-diazabicyclo£5.4.0|undec-7-ene), DBN (1,5-diazabicyclo£4.3.0|non-5-ene), triethylamine or pyridine.
Abstract:
PURPOSE: Provided are novel isoxazolylalkylpiperazine derivatives having selective activity for dopamine D3 and D4 receptor represented by the formula(1) and their manufacturing method by reductive amination in the presence of a reductant. The derivatives and their pharmaceutically acceptable salts are useful in the treatment of mental illness. CONSTITUTION: The novel isoxazolylalkylpiperazine derivative of the formula(1) is prepared by reacting amine compound represented by the chemical formula(2) with aldehyde compound shown in the chemical formula(3) in the presence of a reductant selected from NaBH(OAc)3, NaBH3CN and NaBH4 in a reductive amination reaction. In the formulae, R1,R2,R3,R4, and R5 are same or different each other and are hydrogen atom, halogen atom, C1-C6 alkyl, C1-C6 alkoxy, C2-C6 alkenyl, hydroxy, hydroxymethyl, aryl, heteroaryl, amino group, C1-C6 alkylamino, carbonyl, C3-C8 cycloalkyl, or C3-C8 heterocyclic group; R6 is hydrogen atom, halogen atom, alkyl, C1-C6 alkoxy, aryl, pyridyl, heterocyclic, pyrimidyl group; X is CH or nitrogen atom; and n is 3 or 4.
Abstract:
PURPOSE: A 4-aminopiperidine analogue and a producing method thereof are provided, therefore the compound can be useful as a ligand of a muscarine receptor, and it is thus used in study on Alzheimer disease. CONSTITUTION: The 4-aminopiperidine analogue is represented by formula(I), wherein R1, R2, R3, R4, R5, R6 and R7 are hydrogen, cycloalkyl having carbon number of 1 to 6, alkoxy, halogen, hydroxy, hydroxymethyl, aryl, heteroaryl, amino, alkylamino, alkenyl, carbonyl or hetero ring having carbon number of 5 to 7 wherein aryl is a ring having 6 atoms, two rings having 10 atoms or a stable resonance form having double bond to adjacent carbon; heteroaryl is a single ring aromatic group having carbon number of 5 to 6 or a double ring aromatic group having carbon number of 10 in which the heteroaryl has at least one hetero atom of N, O or S; hetero ring consists of 5 to 7 atoms having 1 to 3 of N, O or S; X is carbon or sulfur; and n is an integer of 1 to 2 wherein n is 1 when X is carbon and is 2 when X is sulfur. The 4-aminopiperidine analogue is produced by reacting piperidine or amine(II) with piperazine with ketone(III) in the presence of 1 to 3 equivalent of acetic acid, 2 to 10 equivalent of reducing agent and solvent at room temperature for 3 to 24 hours to produce 4-aminopiperidine(I) and adding NaHCO3 solution and organic solvent to 4-aminopiperidine(I); and drying the extracted 4-aminopiperidine(I), dissolving it, adding 1 to 10 equivalent of hydrogen chloride to the solution, and separating, washing and drying the hydrochloride of 4-aminopiperidine.
Abstract:
PURPOSE: Provided is a method for manufacturing an iso-oxazole piperazin compound and its salts which can end up developing a lead compound for new drugs. CONSTITUTION: An isooxazol compound is manufactured by the next step: reacting the compound of the formula (2) with the compound of the formula (3) at room temperature, at 0-7 deg.C, in the presence of organic solvent, 0.1-2 equivalent, preferably 1 equivalent of base, and chlorinating agent for 30 minutes-4 hours, preferably 2 hours. Wherein, organic solvent is selected from benzene, methylene chloride, and tetrahydrofuran; a base is selected from methyl amine, ethyl amine, diethyl amine, dimethyl amine, trimethyl amine, cyclohexylamine, diethylisopropylamine, pyridine, or preferably triethylamine; And chlorinating agent is one of chlorine, N-chlorosuccinimide, and sodium hypochlorite. In the formula (1), (2), and (3), R1 and R6 are a phenyl group, benzyl group, halide phenyl group, phenyl group having substituted C1-C6 alkyl group, phenyl group having substituted C1-C6 alkoxy group, methyl phenyl group, or pyridyl group. R2-R5 is hydrogen, and X is nitrogen.