METHOD FOR PRODUCING SUBSTITUTED OXAZOLE
    3.
    发明专利

    公开(公告)号:JP2003176272A

    公开(公告)日:2003-06-24

    申请号:JP2002227292

    申请日:2002-08-05

    Applicant: BASF AG

    Abstract: PROBLEM TO BE SOLVED: To provide a method for producing a 5-alkoxy-substituted oxazole and a method for producing a pyridoxine derivative. SOLUTION: The 5-alkoxy-substituted oxazole is obtained by converting an α-isocyano alkylic acid ester in the presence of a base at >80°C and separating the 5-alkoxy-substituted oxazole from the reaction mixture simultaneously with the converting reaction, and the pyridoxine derivative is obtained by converting an amino acid into an amino acid ester, converting the obtained into a formamido acid ester, converting the obtained into an α-isocyanoalkyl acid ester, converting the obtained into a 5-alkoxy-substituted oxazole in the presence of a base at >80°C and separating the 5-alkoxy-substituted oxazole from the reaction mixture simultaneously with the converting reaction, reacting the obtained 5-alkoxy-substituted oxazole with a protective diol to obtain an Diels-Alder adduct and treating the obtained with an acid and removing the protective group to convert into the pyridoxine derivative. COPYRIGHT: (C)2003,JPO

    PRODUCTION OF ALKYNE DIOLS
    4.
    发明专利

    公开(公告)号:JP2001002607A

    公开(公告)日:2001-01-09

    申请号:JP2000155227

    申请日:2000-05-25

    Applicant: BASF AG

    Abstract: PROBLEM TO BE SOLVED: To obtain the subject alkyne diol by allowing a specific compound to react with acetylene in the presence of a basic alkali metal salt as a catalyst in a polar aprotic solvent in need of a trace or catalytic amount of base. SOLUTION: (A) A compound of the formula: R1-C(=O)-R2 [R1 and R2 are each H, a 1-20C hydrocarbon (which may bear a C-C double or triple bond that is interrupted with a substituted and nonadjacent hetero atom)] and (B) acetylene are allowed to react with each other in the presence of (C) a catalyst of a basic alkali metal salt in an amount of 5-65 mol.% based on the component B in (D) a polar aprotic solvent (for example, tetrahydrofuran) under a pressure of 0.1-10 bar at -20-60 deg.C to give an objective compound represented by the formula: R1R2C(OH)-C≡C-C(OH)R1R2. As the component C, is preferably cited an alkali metal alkoxide (for example, potassium alkoxide).

    METHOD FOR CONTINUOUSLY PRODUCING SUBSTITUTED OXAZOLE

    公开(公告)号:JP2003201283A

    公开(公告)日:2003-07-18

    申请号:JP2002227742

    申请日:2002-08-05

    Applicant: BASF AG

    Abstract: PROBLEM TO BE SOLVED: To provide a method for continuously producing a 5-alkoxy-substituted oxazole and a method for producing a pyridoxine derivative by using the same. SOLUTION: This method for obtaining a pyridoxine derivative is provided by converting an α-isocyanoalkanoic acid ester expressed by the formula II in the presence of continuously supplied base at ≥80°C temperature to a 5- alkoxy-substituted oxazole I, taking it out from a reactor at the same time with the reaction, performing a reaction of the compound I with a compound VI to make a compound VII, and acid-treating it to obtain a pyridoxine derivative IX (in formulae, R 1 is an alkyl, R 2 is H or an alkyl, R 3 , R 4 are each independently a protection group of hydroxy group). COPYRIGHT: (C)2003,JPO

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