Design and synthesis of benzene-fused heterocycles: aminopyridazinones, chromenopyridinones and benzopyrazoloxazepines /

Keskin, Selbi
The interest in the synthesis of heterocyclic compounds has increased day by day due to their biological activities. This study focuses on the synthesis of different benzene-fused heterocycles. In the first part, we synthesized novel class of compounds, 4-aminophthalazin-1(2H)-ones starting from methyl 2-(2-methoxy-2-oxoethyl)-benzoate. Methylene group in this starting material was oxidized to the corresponding ketoester. Reaction of ketoesters with hydrazine derivatives provided the hydrazone derivatives. An intramolecular cyclization in the presence of thionyl chloride formed fused pyridazinone skeleton. Hydrolysis of the remaining ester groups and transformation of the acid functionalities to the acyl azides followed by Curtius rearrangement gave the isocyanates. Reaction of the isocyanates with methanol and water produced urethane and aminopyridazinone derivatives, respectively. In the second part of this thesis, a concise and regioselective approach to the synthesis of chromenopyridine and chromenopyridinone derivatives was developed. The synthetic strategy relies on the O-propargylation of aromatic hydroxyaldehydes followed by the reaction with propargylamine. The intramolecular cycloaddition reaction between the alkyne and azadiene, which was formed as an intermediate, furnished the desired skeleton. Benzopyrazoloxazepine and benzopyrazoloxazocine skeletons were also formed via alkyne cyclization in the presence of gold catalyst.


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Citation Formats
S. Keskin, “Design and synthesis of benzene-fused heterocycles: aminopyridazinones, chromenopyridinones and benzopyrazoloxazepines /,” Ph.D. - Doctoral Program, Middle East Technical University, 2015.