Palladium/Copper Co-catalyzed Oxidative C–H/C–H Carbonylation of Diphenylamines: A Way To Access Acridones
作者:Jiangwei Wen、Shan Tang、Fan Zhang、Renyi Shi、Aiwen Lei
DOI:10.1021/acs.orglett.6b03356
日期:2017.1.6
palladium/copper co-catalyzed oxidativedoubleC(sp2)–H functionalization/carbonylation of diphenylamines for synthesis of acridones has been developed. This method utilizes readily available starting materials and mild reaction conditions. The protocol provides a simple, efficient, and atom-economic way to access acridones. Notably, the present protocol has excellent functional group tolerance and application
A process for preparing cyclohexanonecarboxylate ester intermediates for the preparation of 1,2,3,4-tetrahydro-7-(phenyl)amino-9(10H)acridinone and 2-(phenyl)amino-9(10H)acridinone and for preparing said acridinones.
A solid solution of a quinacridonequinone with a stabilizer selected from the group consisting of 2-anilinoacridone, 5,6,7,8-tetrahydro-2-anilinoacridone, 6-anilinoquinolone and 2-aminoacridone of improved lightfastness is provided which displays improved dispersibility while still maintaining a high degree of transparency in automotive finishes when post-treated with a surfactant.
An improved process for the preparation of optionally substituted 2-anilinoacridones from optionally substituted 2,5-dianilinoterephthalic acids, comprises: (a) cyclizing 2,5-dianilinoterephthalic acid to give an intermediate product mixture which contains a major portion of a 2-anilino-3-carboxyacridone and a minor portion of a quinacridone; (b) combining said intermediate product mixture with a solvent which dissolves the 2-anilino-3-carboxyacridone at elevated temperatures but does not dissolve the quinacridone; (c) decarboxylating the 2-anilino-3-carboxyacridone in the mixture from step (b) at elevated temperatures to yield a product slurry comprising a solid quinacridone and a 2-anilinoacridone dissolved in the solvent; (d) separating the solid quinacridone, the catalyst, and other solid impurities from the solvent, whereby a solution containing the dissolved 2-anilinoacridone is obtained; and (e) subsequently separating the dissolved 2-anilinoacridone from the solvent. This process provides 2-anilinoacridone in high yield and purity. A process for the preparation of 2-anilinoacridone/quinacridonequinone high performance golden yellow pigments is also described.