Palladium-Catalyzed Carbonylative Cycloisomerization of γ-Propynyl-1,3-diketones: A Concise Route to Polysubstituted Furans
作者:Yu Li、Zhengkun Yu
DOI:10.1021/jo9020634
日期:2009.11.20
trisubstituted furan derivatives have been efficiently synthesized via palladium(II)-catalyzed intramolecular carbonylative cycloisomerization of γ-propynyl-1,3-diketones with aryl iodides and carbon monoxide. The mechanism suggests that in situ generated acylpalladium species from the carbonylation of aryl iodide initiates the reaction followed by cyclization of the enolized isomer of a 1,3-diketone substrate
通过钯(II)催化的γ-丙炔基-1,3-二酮与芳基碘化物和一氧化碳的分子内羰基环化异构化,可以有效地合成二取代和三取代的呋喃衍生物。该机制表明,由芳基碘化物的羰基化原位生成的酰基铝物种引发了反应,然后通过碳-碳三键活化作用环化了1,3-二酮底物的烯醇化异构体。