作者:Chaoren Shen、Wanfang Li、Hongfei Yin、Anke Spannenberg、Troels Skrydstrup、Xiao-Feng Wu
DOI:10.1002/adsc.201500858
日期:2016.2.4
An unexpected palladium‐catalyzed carbonylative synthesis of 2,3‐disubstituted chromones has been developed. Starting from 2‐bromofluorobenzenes and ketones, the corresponding chromones were produced in good yields. By control experiments, this transformation was found to proceed through a sequential carbonylation/Claisen–Hasse rearrangement/intramolecular nucleophilic aromatic substitution approach
已经开发出了出乎意料的钯催化的2,3-二取代色酮的羰基合成。从2-溴氟苯和酮开始,以高收率生产了相应的色酮。由对照实验中,这种转变被发现通过连续的羰基化/克莱森-哈斯重排/分子内的亲核芳香取代的方法(S进行Ñ AR)。更具体地说,反应顺序始于酮与邻溴氟苯的钯催化羰基化反应,得到乙烯基苯甲酸酯,随后通过克莱森-哈斯重排将其转化为1,3-二酮。最终产物的分子内年代后产生Ñ的氩反应原位形成1,3-二酮。