I found the field of Chemistry very interesting. Saw the article Oxidative C-H/N-H Annulation of Aromatic Amides with Dialkyl Malonates: Access to Isoindolinones and Dihydrobenzoindoles published in 2020.0. Category: phthalazines, Reprint Addresses Punniyamurthy, T (corresponding author), Indian Inst Technol Guwahati, Dept Chem, Gauhati 781039, India.. The CAS is 62-23-7. Through research, I have a further understanding and discovery of 4-Nitrobenzoic acid
A copper-mediated oxidative C-H/N-H annulation of aromatic amides with dialkyl malonates has been presented to afford synthetically valuable dihydrobenzoindoles and isoindolinones. The reaction proceeds through direct oxidative C(sp(2))H/C(sp(3))-H coupling followed by an intramolecular N-H/C(sp(3))-H dehydrogenative coupling to deliver the target motifs with broad scope and functional group tolerance.
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Reference:
Phthalazine – Wikipedia,
,Phthalazine | C8H6N2 – PubChem