Transition-Metal-Free Intramolecular Ullmann-Type O-Arylation: Synthesis of Chromone Derivatives
作者:Jie Zhao、Yufen Zhao、Hua Fu
DOI:10.1002/anie.201007302
日期:2011.4.11
Expect the upexpected: A transition‐metal‐free approach to access chromone derivatives has been developed. The intramolecular O‐arylation of substituted 1‐(2‐haloaryl)‐propane‐1,3‐diones in DMF in the presence of K2CO3 gave the corresponding target products in good to excellent yields (see scheme; DMF=N,N′‐dimethylformamide).
期望超出预期:已开发出一种无过渡金属的方法来获取色酮衍生物。在存在K 2 CO 3的情况下,在DMF中进行取代的1-(2-卤代芳基)-丙烷-1,3-二酮的分子内O-芳基化反应,相应的目标产物收率良好至优异(参见方案; DMF = N,N'-二甲基甲酰胺)。
K<sub>2</sub>CO<sub>3</sub>-Catalyzed Synthesis of Chromones and 4-Quinolones through the Cleavage of Aromatic C–O Bonds
作者:Jie Zhao、Yufen Zhao、Hua Fu
DOI:10.1021/ol300908g
日期:2012.6.1
Phenol-derived electrophiles are favorable substrates because phenols are naturally abundant or can be readily prepared from other aromatic compounds. However, the cleavage of aromatic C-O bonds Is a great challenge because of their high energy. K2CO3-catalyzed intramolecular cyclization of 1-(2-alkoxyphenyl)-3-akylpropane-1,3-dlone and 3-(alkylimino)-1-(2-methoxyphenyl)-2-methylpropan-1-one derivatives via the selective cleavage of aromatic C-O bonds Is reported. The corresponding chromone and 4-quinolone derivatives were obtained in reasonable yields.
Jyotsna, D.; Rao, A. V. Subba, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1987, vol. 26, # 1-12, p. 877 - 878
作者:Jyotsna, D.、Rao, A. V. Subba
DOI:——
日期:——
Chakravarti; Dutta, Journal of the Indian Chemical Society, 1939, vol. 16, p. 639,644
作者:Chakravarti、Dutta
DOI:——
日期:——
Ghotekar; Mandhane; Joshi, Indian Journal of Heterocyclic Chemistry, 2010, vol. 19, # 4, p. 341 - 344