In organic chemistry, atoms other than carbon and hydrogen are generally referred to as heteroatoms. The most common heteroatoms are nitrogen, oxygen and sulfur. Now I present to you an article called Synthesis and action on the central nervous system of some N2-substituted cinnoline derivatives, published in 1994-06-30, which mentions a compound: 137195-33-6, mainly applied to central nervous system cinnoline derivative preparation, Category: cinnoline.
Alkylation of 4-hydroxycinnolines using Et bromoacetate resulted in N2-substituted acetic acids. These acids were converted to esters and amides. Some of the obtained acids were reduced with zinc dust to give 4-oxo-1,2,3,4-tetrahydro-2-cinnolineacetic acids. Several of the compounds were tested for their effect on central nervous system.
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Reference:
Cinnoline – Wikipedia,
Cinnoline – an overview | ScienceDirect Topics