Abstract:
PROBLEM TO BE SOLVED: To provide a practical process for industrial production of an optically active 3-amino-2-hydroxypropionic acid cyclopropylamide derivative or a salt thereof useful as an intermediate of a medicine from a low cost and easily obtainable raw material, and useful intermediates thereof.SOLUTION: At first, an optically active epoxycarboxylic acid derivative is produced by an asymmetric reduction of an easily available 2-halo-3-oxopropionic acid derivative, followed by epoxidation of the resulting substance. Then, the optically active epoxycarboxylic acid derivative is reacted with cyclopropylamine to convert it into an optically active epoxyamide derivative, which derivative is then reacted with a nitrile to produce an optically active oxazolinamide derivative. Subsequently, an optically active 3-amino-2-hydroxypropionic acid cyclopropylamide derivative or a salt thereof is produced by a selective acid solvolysis of the oxazoline skeleton.
Abstract:
PROBLEM TO BE SOLVED: To inexpensively and efficiently produce (S)-1-phenyl-1,2,3,4-tetrahydroisoquinoline useful as an intermediate for a medicine and having high optical purity.SOLUTION: The (S)-1-phenyl-1,2,3,4-tetrahydroisoquinoline having the high optical purity can be produced by forming a salt from the easily available (S)-1-phenyl-1,2,3,4-tetrahydroisoquinoline having low optical purity and an inexpensive acid such as acetic acid and p-toluenesulfonic acid, and crystallizing the salt.
Abstract:
PROBLEM TO BE SOLVED: To provide a method for isolating and purifying an optically active 1-t-butoxycarbonyl-3-aminopyrrolidine salt, by which the highly pure optically active 1-t-butoxycarbonyl-3-aminopyrrolidine salt can be obtained in a high yield and by which the production of the salt can simply and efficiently be performed in a commercial scale. SOLUTION: This method for isolating and purifying the optically active 1-t-butoxycarbonyl-3-aminopyrrolidine salt is characterized by forming a salt from the optically active 1-t-butoxycarbonyl-3-aminopyrrolidine and an acid, crystallizing the salt, and isolating the optically active 1-t-butoxycarbonyl-3-aminopyrrolidine salt as the crystals to leave contaminated impurities such as enantiomer and 1-t-butoxycarbonyl-3-t-butoxycarbonyl-aminopyrrolidine in the mother liquor. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a method which can easily produce an optically active 3-amino piperidine or a salt thereof useful as a pharmaceutical intermediate from an inexpensive and easily available starting material and is practical for industrial production thereof, and to provide the intermediate useful for producing the optically active 3-amino piperidine or the salt thereof.SOLUTION: The method for producing the optically active 3-aminopiperidine or salt thereof includes: a process of stereoselectively hydrolyzing a racemic nipecotamide to convert into an optically active nipecotamide and an optically active nipecotic acid in the presence of an enzyme source derived from microorganism; and a process of subsequently subjecting the optically active nipecotamide to aroylation, Hofmann rearrangement, protection of amino groups and deprotection, and deriving the optically active nipecotamide into the optically active aminopiperidine or the salt thereof, or subjecting the optically active nipecotamide to selective protection with BOC (t-botoxycarbonyl), Hofmann rearrangement and deprotection and, thereby, deriving the optically active nipecotamide into the optically active aminopiperidine or the salt thereof. The optically active 3-aminopiperidine or the salt thereof useful as the pharmaceutical intermediate can be produced by an easy method applicable for industrial production from easily available starting material. Further, the intermediate useful for the production method is provided.
Abstract:
PROBLEM TO BE SOLVED: To provide an asymmetric reducing agent capable of easily being prepared from inexpensive and easily available raw materials, and also a method for producing an optically active tetrahydroisoquinoline derivative or its salt useful as a medicinal intermediate in a high optical purity, inexpensively and simply, and suitable for an industrial production. SOLUTION: This asymmetric reducing agent is prepared by an organic carboxylic acid having a predetermined acidity, an optically active proline derivative and a metal borohydride. Also, by using the asymmetric reducing agent, 1,2-dihydroisoquinoline is reduced, to prepare the optically active tetrahydroisoquinoline derivative. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a simple industrial method for producing an L- or D-optically active α-methylcysteine derivative or its salt, which is a useful pharmaceutical intermediate, from readily available, inexpensive raw materials. SOLUTION: The method for producing an L- or D-optically active α-methylcysteine derivative or its salt, includes D-selectively cyclizing a racemic N-carbamoyl-α-methylcysteine derivative or its salt with hydantoinase to produce a D-5-methyl-5-thiomethylhydantoin derivative or its salt and an N-carbamoyl-α-methyl-L-cysteine derivative or its salt, and deprotecting the amino group and then the sulfur atom, and then hydrolyzing. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a process for producing an optically active 3-hydroxypropionic ester derivative useful as an intermediate for a medicament. SOLUTION: The process for producing the optically active 3-hydroxypropionic ester derivative comprises synthesizing a 2-formylacetic ester derivative by using an acetic ester derivative available at low cost, a formic ester and a base, and then stereoselectively reducing the formyl group of the derivative by use of an enzymatic source capable of stereoselectively reducing the formyl group thereof. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a method for safely and efficiently producing optically active 1-phenyl-4-methyl-2-azetidinone useful as an intermediate for medicines and agrochemicals from an inexpensive and easily available raw material at a low cost. SOLUTION: This optically active 1-phenyl-4-methyl-2-azetidinone is produced from an inexpensive and easily available optically active N-aryl-3-sulfonyloxybutanoic acid amide derivative using inexpensive, easily available and safe sodium hydroxide or potassium hydroxide in a good yield. COPYRIGHT: (C)2009,JPO&INPIT