Process for producing pyridine-2,3-dicarboxylic acid derivatives; and novel 1-amino-1,2,3,4-tetrahydropyridine-2,3-dicarboxylic acid derivatives and 1,4-dihydropyridine-2,3-dicarboxylic acid derivatives

Granted: Jun 28, 1988 Filed: Aug 2, 1985

This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.