Palladium-Catalyzed Sequential C(<i>sp</i>
<sup>2</sup>
)-H Alkynylation/Annulation of 2-Phenylphenols with Haloalkynes Using Phenolic Hydroxyl as the Traceless Directing Group
作者:Guangbin Jiang、Songjia Fang、Weigao Hu、Jianxiao Li、Chuanle Zhu、Wanqing Wu、Huanfeng Jiang
DOI:10.1002/adsc.201800138
日期:2018.6.15
An efficient, palladium(II)‐catalyzed, C(sp2)‐H alkynylation/annulation of 2‐phenylphenols with haloalkynes for the synthesis of substituted 6‐methylene‐6H‐dibenzo[b,d]pyrans is reported. This protocol features a traceless directing group strategy, unique regioselectivity and mild reaction conditions. Significantly, preliminary mechanistic studies suggest that the sequential C(sp2)‐H alkynylation and
报道了一种高效的钯(II)催化的2-苯基苯酚与卤代炔烃的C(sp 2)-H烷基化/环化反应,用于合成取代的6-亚甲基-6 H-二苯并[ b,d ]吡喃。该协议具有无痕导向组策略,独特的区域选择性和温和的反应条件。重要的是,初步的机理研究表明,连续的C(sp 2)-H炔基化和环化反应可能与转化过程有关。