6.
    发明专利
    未知

    公开(公告)号:DK0968189T3

    公开(公告)日:2002-02-18

    申请号:DK98906497

    申请日:1998-02-18

    Applicant: ABBOTT LAB

    Abstract: The present invention relates to an improved process for the preparation of nicotinic acids represented by the following structural formula (I): I which are prepared by reacting a nicotinic amide compound having the formula: under acidic conditions with a nitrite salt. In the process of the invention have the groups R1, R2, and R3, in the compounds are independently selected from the group consisting of hydrogen, and halogen atoms and R4 is selected from the group consisting of hydrogen, lower alkyl and aryl. The process provides the nicotinic acid compounds in improved yields.

    7.
    发明专利
    未知

    公开(公告)号:AT208378T

    公开(公告)日:2001-11-15

    申请号:AT98906497

    申请日:1998-02-18

    Applicant: ABBOTT LAB

    Abstract: The present invention relates to an improved process for the preparation of nicotinic acids represented by the following structural formula (I): I which are prepared by reacting a nicotinic amide compound having the formula: under acidic conditions with a nitrite salt. In the process of the invention have the groups R1, R2, and R3, in the compounds are independently selected from the group consisting of hydrogen, and halogen atoms and R4 is selected from the group consisting of hydrogen, lower alkyl and aryl. The process provides the nicotinic acid compounds in improved yields.

    Process for the preparation of nicotinic acids

    公开(公告)号:AU737619B2

    公开(公告)日:2001-08-23

    申请号:AU6170798

    申请日:1998-02-18

    Applicant: ABBOTT LAB

    Abstract: The present invention relates to an improved process for the preparation of nicotinic acids represented by the following structural formula (I): I which are prepared by reacting a nicotinic amide compound having the formula: under acidic conditions with a nitrite salt. In the process of the invention have the groups R1, R2, and R3, in the compounds are independently selected from the group consisting of hydrogen, and halogen atoms and R4 is selected from the group consisting of hydrogen, lower alkyl and aryl. The process provides the nicotinic acid compounds in improved yields.

    PROCESS FOR THE PREPARATION OF NICOTINIC ACIDS

    公开(公告)号:CA2282381A1

    公开(公告)日:1998-09-11

    申请号:CA2282381

    申请日:1998-02-18

    Applicant: ABBOTT LAB

    Abstract: The present invention relates to an improved process for the preparation of nicotinic acids represented by structural formula (I) which are prepared by reacting a nicotinic amide compound having formula (a) under acidic conditions with a nitrite salt. In the process of the invention the groups R1, R2, and R3, in the compounds are independently selected from the group consisting of hydrogen and halogen atoms, and R4 is selected from the group consisting of hydrogen, lower alkyl and aryl. The process provides the nicotinic acid compounds in improved yields.

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