A new synthesis of 3(2<i>H</i>)-furanones from acetylenic β-diketones
作者:Ibrahim El-Sayed El-Kholy、Morcos Michael Mishrikey、Mohamed Gaber Marei
DOI:10.1002/jhet.5570190633
日期:1982.11
Thermal cyclization of 1,5-diarylpent-1-yne-3,5-diones led to the formation of 2-benzyliden-5-aryl-3(2H) furanones as well as 2,6-diaryl-4H-pyran-4-ones as minor products. The structure of the furanones was established from their ir, 1H nmr and mass spectral data. Their reaction with hydrazine hydrate gave pyrazole derivatives.
1,5-二芳基戊-1-炔-3,5-二酮的热环化导致形成2-苄叉基-5-芳基-3(2 H)呋喃酮以及2,6-二芳基-4 H-吡喃-4-ones作为次要产品。呋喃酮的结构由其ir,1 H nmr和质谱数据确定。它们与水合肼反应,得到吡唑衍生物。
Synthesis of 4-Pyrones by Formal Hydration of 1,3-Diynones Promoted by 1,4-Addition of Piperidine
作者:Erandi Liyanage Perera、Daesung Lee
DOI:10.1021/acs.orglett.2c02914
日期:2022.9.30
A new approach for the synthesis of 4-pyrones with broader substrate scope and functional group tolerance is described. The reaction proceeds via an initial 1,4-addition by piperidine, followed by nitrogen-assisted 6-endo-dig cyclization and hydrolysis. 1,3-Diynones with nonenolizable electron-withdrawing ketones and nonpropargylic H provide relatively high yields. For substrates with particular R2
描述了一种合成具有更广泛底物范围和官能团耐受性的 4-吡喃酮的新方法。该反应通过哌啶的初始 1,4-加成,然后是氮辅助 6 -endo-dig环化和水解进行。具有非烯醇化吸电子酮和非炔丙基 H 的 1,3-二炔酮提供相对较高的产率。对于具有特定 R 2取代基的底物,分离出 1,4- 或 1,6-加合物,这表明 R 2取代基的空间和电子因素应该对 6 -endo-dig环化产生强烈影响。
The pyrone series. Part I. 2 : 6-Diaryl-4-pyrones
作者:Gabra Soliman、Ibrahim El-Sayed El-Kholy
DOI:10.1039/jr9540001755
日期:——
Marei, Mohamed Gaber; Ghonaim, Reda Ali, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1993, vol. 32, # 4, p. 418 - 421
作者:Marei, Mohamed Gaber、Ghonaim, Reda Ali
DOI:——
日期:——
Marei, Mohamed Gaber; El-Kholy, Ibrahim El-Sayed; Mishrikey, Morcos Michael, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1988, vol. 27, # 1-12, p. 370 - 372
作者:Marei, Mohamed Gaber、El-Kholy, Ibrahim El-Sayed、Mishrikey, Morcos Michael