Rhodium-Catalyzed (5+1) Annulations Between 2-Alkenylphenols and Allenes: A Practical Entry to 2,2-Disubstituted 2<i>H</i>-Chromenes
作者:Noelia Casanova、Andrés Seoane、José L. Mascareñas、Moisés Gulías
DOI:10.1002/anie.201410350
日期:2015.2.16
alkenylphenols react with allenes under rhodium catalysis to provide valuable 2,2‐disubstituted 2H‐chromenes. The whole process, which involves the cleavage of one CH bond of the alkenyl moiety and the participation of the allene as a one‐carbon cycloaddition partner, can be considered a simple, versatile, and atom‐economical (5+1) heteroannulation. The reaction tolerates a broad range of substituents
易于获得的烯基苯酚在铑催化下与丙二烯反应,生成有价值的2,2-二取代的2H-色烯。整个过程涉及烯基部分的一个CH键的断裂和作为一个碳环加成伙伴的丙二烯的参与,可以认为是一种简单,通用且原子经济的(5 + 1)杂环化过程。该反应在烯基苯酚和丙二烯中都可以耐受广泛的取代基,并且很可能是通过一种机理进行的,该机理涉及铑催化的CC偶联,随后是两个连续的周环过程。