Pyrazino[2,3-D]isoxazole derivative which is useful as a production intermediate of pyrazine carboxamide derivative
申请人:FUJIFILM Corporation
公开号:US08901302B2
公开(公告)日:2014-12-02
The object of the present invention is to provide a compound which is useful as a production intermediate of pyrazine carboxamide derivative such as 6-fluoro-3-hydroxy-2-pyrazine carboxamide. The present invention provides a pyrazino[2,3-d]isoxazole derivative represented by the formula (I):
wherein X represents a halogen atom, a hydroxyl group or a sulfamoyloxy group, and Y represents —C(═O)R or —CN; wherein R represents a hydrogen atom, an alkoxy group an aryloxy group, an alkyl group, an aryl group or an amino group.
SUBSTITUTED PYRAZINO[2,3-D]ISOOXAZOLES AS INTERMEDIATES FOR THE SYNTHESIS OF SUBSTITUTED PYRAZINECARBOXAMIDES
申请人:FUJIFILM Corporation
公开号:US20150051396A1
公开(公告)日:2015-02-19
The object of the present invention is to provide a compound which is useful as a production intermediate of pyrazine carboxamide derivative such as 6-fluoro-3-hydroxy-2-pyrazine carboxamide. The present invention provides a pyrazino[2,3-d]isoxazole derivative represented by the formula (I):
wherein X represents a halogen atom, a hydroxyl group or a sulfamoyloxy group, and Y represents —C(═O)R or —CN; wherein R represents a hydrogen atom, an alkoxy group an aryloxy group, an alkyl group, an aryl group or an amino group.
Substituted pyrazino[2,3-d]isooxazoles as intermediates for the synthesis of substituted pyrazinecarbonitriles and substituted pyrazinecarboxamides
申请人:FUJIFILM Corporation
公开号:US09181203B2
公开(公告)日:2015-11-10
The object of the present invention is to provide a compound which is useful as a production intermediate of pyrazine carboxamide derivative such as 6-fluoro-3-hydroxy-2-pyrazine carboxamide. The present invention provides a pyrazino[2,3-d]isoxazole derivative represented by the formula (I):
wherein X represents a halogen atom, a hydroxyl group or a sulfamoyloxy group, and Y represents —C(═O)R or —CN; wherein R represents a hydrogen atom, an alkoxy group an aryloxy group, an alkyl group, an aryl group or an amino group.
Process for the preparation of N-substituted maleimides
申请人:Tosoh Corporation
公开号:EP0393713A1
公开(公告)日:1990-10-24
N-substituted maleimide represented by formula (2):
is produced from N-substituted maleamic acid monoester represented by formula (1):
in the presence of an acid catalyst by elimination of an alcohol from the monoester. The above N-substituted maleamic acid monoester represented by formula (1) is produced by esterification of N-substituted maleamic acid represented by formula (3):
with an alcohol R² -OH in the presence of an acid catalyst.