作者:Anne‐Laure Auvinet、Joseph P. A. Harrity
DOI:10.1002/anie.201007598
日期:2011.3.14
Off and on: A nickel‐catalyzed benzannulation of alkynylboronates provides functionalized phenols with high levels of chemo‐ and regioselectively. While transmetalation of organoboron intermediate to organonickel does not occur during cycloaddition, it is “switched on” by addition of base, thus allowing a one‐pot benzannulation and cross‐coupling to be realized (see scheme; Pin=pinacolato, Ms=mesyl)
关闭和开启:alkynylboronates的镍催化的苯并环化提供了官能化具有高水平的化疗和区域选择性酚。虽然在环加成过程中不会发生有机硼中间体向有机镍的重金属化,但可以通过添加碱来“接通”,因此可以实现单锅苯并环化和交叉偶联(参见方案; Pin = pinacolato,Ms = mesyl) 。