Abstract:
PURPOSE: Provided is an industrially available method for producing 2-hydroxy-N-(2-hydroxyethyl)-3- methoxy-5-(2-propenyl)benzamide in substantially higher yield than that of existing method. CONSTITUTION: The method comprises the steps of (i) reacting a compound of formula II with allyl bromide in the presence of alkali to form a compound of formula III; (ii) performing a Claisen rearrangement of the compound of formula III with heating, so as to form a compound of formula IV; and (iii) reacting the compound of formula IV with ethanolamine to form a compound of formula V. In the formulas, R is C1-C9 alkyl group, provided that ethyl group is excluded.
Abstract:
PURPOSE: A ziprasidone hydrochloride 1.5 hydrate with novel crystal and a method for preparing the same are provided to ensure 99.5% or more of crystal purity and high stability. CONSTITUTION: A method for preparing crystalline ziprasidone hydrochloride 1.5 hydrate comprises: a step of recrystalizing ziprasidone base in a solvent containing 1-methyl-2-pyrrolidone or dimethylsulfoxide; a step of adding t-butylmethyl ether, buthylmethyl ether and sec-butylmethyl ether or mixture thereof to prepare slurry; and a step of obtaining crystalline ziprasidone hydrochloride 1.5 hydrate.
Abstract:
PURPOSE: A method for isolating and preparing S-(-)-amlodipine is provided to simply and economically isolate and prepare S-(-)-amlodipine having high optical purity. CONSTITUTION: A method for preparing S-(-)-amlodipine compound of chemical formula 1 comprises: a step of reacting racemic amlodipine with L-tartaric acid in tetrahydrofuran solvent; a step of isolating the reactant to precipitate and reaction solution; a step of reacting the isolated reaction solution with D-tartaric acid; a step of reacting (S)-(-)-amlodipine-hemi-D-tartrate-2THF with reaction solution; and a step of reacting the precipitate and base. The solvent containing tetrahydrofuran is tetrahydrofuran single solvent.
Abstract:
PURPOSE: Provided is a method of preparing 1,2,3-tris(2-diethylaminoethoxy)benzene and a method of preparing 1,2,3-tris(2-triethylammoniumethoxy)benzene triiodide, gallamine triethiodide. The process enables industrial mass production with high yield. CONSTITUTION: The method of preparing 1,2,3-tris(2-diethylaminoethoxy)benzene comprises the steps of: (a) making pyrogallol lithium salt by reacting pyrogallol and lithium hydroxide or hydrate thereof; and (b) reacting pyrogallol lithium salt obtained from (a) with diethylaminoethyl chloride at 80-130deg.C. The gallamine triethiodide is obtained by reacting 1,2,3-tris(2-diethylaminoethoxy)benzene obtained from (b) with ethyl iodide. The reaction step of (a) and (b) is one pot reaction and the solvent used is selected from acetone, DMF, dioxane, dimethylsulfoxide, acetonitrile, diglyme or their mixture.
Abstract:
PURPOSE: A process for preparing erdosteine is provided, thereby minimizing formation of impurities and preparing erdosteine in higher yield under mild condition. CONSTITUTION: The process for preparing erdosteine comprises reacting 3-chloroacetamido-2-oxo-tetrahydrothiophene with mercaptoacetic acid in the presence of base and organic solvent or a mixed solvent of organic solvent and water at 45 to 70 deg. C, wherein the base is selected from sodium carbonate, pyridine, ammonia water, diethylamine, triethylamine, 2,6-lutidine, 2,3-lutidine, 3,4-lutidine, lithium hydroxide or hydrates thereof, calcium hydroxide, potassium carbonate, potassium bicarbonate, potassium acetic acid and sodium acetic acid; and the organic solvent is selected from acetone, acetonitrile, N,N-dimethylformamide, 1,4-dioxane, dimethylsulfoxide, ethanol, methanol, tetrahydrofuran or a mixture thereof.
Abstract:
PURPOSE: A process for producing aromatic cyclic derivatives using palladium-loaded zeolite is provided, thereby simplifying the production process of aromatic cyclic derivatives and reducing the production costs by reuse of palladium as catalyst. CONSTITUTION: A process for producing aromatic cyclic derivatives of the formula(1) using palladium-loaded zeolite comprises reacting a compound of the formula(2) or N-acetylated derivatives thereof with a compound of the formula(3) in the presence of chlorine-containing salt and base using palladium-loaded zeolite as catalyst, wherein X is carbohydrate radical and forms aromatic ring with carbon; the aromatic ring comprises one or more hetero selected from N, S and O and is substituted by C1-C4 alkyl, C1-C4 alkoxy or pyrolidinyl; R1 and R2 are independently hydrogen, C1-C18 alkyl, C1-C18 alkoxy - C1-C18 alkyl, C3-C18 cycloalkenyl, phenyl, C1-C4 alkyl and/or halogen substituted phenyl, benzyl, (tetrahydro-pyran-2-yl) oxy-C1-C18 alkyl, (4-methylphenyl)sulfonyl, thiophenyl optionally substituted with acetyl, quinolinyl, pyridinyl optionally substituted with C1-C18 alkyl, tri-C1-C18 alkyl-silyl, or 4,5-dihydro-thiopenyl optionally substituted with acetyl; and Y is halogen.