2013
DOI: 10.1021/jo400989q
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Strategy for the Synthesis of Pyridazine Heterocycles and Their Derivatives

Abstract: The first synthesis of novel fused pyridazines has been realized starting from 1,3-diketones involving a Diaza-Wittig reaction as a key step. A convenient strategy was elaborated to access versatile pyridazine derivatives allowing the variation of substituents at position 6 of the heterocyclic ring. In a first part, pyridazines bearing an ester group were synthesized as a model to evaluate the methodology. In a second part, an improved procedure has been used for the synthesis of pyridazines bearing a ketone g… Show more

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Cited by 52 publications
(7 citation statements)
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“…However, there are only limited protocols for assembling 3-carbonyl substituted pyridazine derivatives, important intermediates in organic synthesis . Traditional methods include diaza-Wittig reactions of 1,3-diketones, addition of diazo compounds to Morita–Baylis–Hillman carbonates, [4 + 2] cycloaddition of substituted 1,2,3-triazines, cascade reactions of pyridiniumylides, and cycloaddition of 1,2,4,5-tetrazine with alkynes . Despite the impressive progress made in this area, it is still a great challenge to synthesize functionalized pyridazines from readily available and easily varied starting materials using a simple procedure.…”
mentioning
confidence: 99%
“…However, there are only limited protocols for assembling 3-carbonyl substituted pyridazine derivatives, important intermediates in organic synthesis . Traditional methods include diaza-Wittig reactions of 1,3-diketones, addition of diazo compounds to Morita–Baylis–Hillman carbonates, [4 + 2] cycloaddition of substituted 1,2,3-triazines, cascade reactions of pyridiniumylides, and cycloaddition of 1,2,4,5-tetrazine with alkynes . Despite the impressive progress made in this area, it is still a great challenge to synthesize functionalized pyridazines from readily available and easily varied starting materials using a simple procedure.…”
mentioning
confidence: 99%
“…The molecular structures of all the objectives with bond length in Å are shown in Schemes –. Some of these molecules or their analogues have already been reported previously, such as A1–1, A2–1, B2–1, C1–2, E1–1, F1–1, G1, G1–1, G1–2, G2–1, H1, H1–1, H1–2, H2, H2–1, H2–5, H3, I1, I1–1, I1–4, and J1, providing sufficient bases for comparing the calculated and experimental results.…”
Section: Resultsmentioning
confidence: 90%
“…Indeed, the dual mechanism (deprotonation/nucleophilic addition) induced by LDA in THF at a low temperature has been highlighted on α,β-ethylenic esters and thoroughly investigated . Moreover, the addition of PPh 3 , Ge­[N­(SiMe 3 ) 2 ] 2 , or a carbon nucleophile on the diazo function of diazodicarbonyl moieties as well as the addition of Et 3 N on the diazo function of diazomalodinitrile have been well-documented. In the light of these examples, an original mechanistic rationale was proposed to explain the outcome of the aldolisation between TIPS-diazoacetone 1 and benzaldehyde 2a in the presence of LDA (Scheme ).…”
Section: Resultsmentioning
confidence: 99%