Palladium-Catalyzed Hydrobenzylation of<i>ortho</i>-Tolyl Alkynyl Ethers by Benzylic CH Activation: Remarkable Alkynoxy-Directing Effect
作者:Yasunori Minami、Kotomi Yamada、Tamejiro Hiyama
DOI:10.1002/anie.201304893
日期:2013.9.27
The title reaction involves palladium(0)‐catalyzed insertion of CC bonds into benzylic C(sp3)H bonds, thus providing efficient access to 2‐methylene‐2,3‐dihydrobenzofurans, which transform into benzofurans upon treatment with a weak acid (e.g., AcOH) and electrophiles. The alkynoxy group serves as a directing group in promoting CH bond functionalization.
它的选择性:标题反应涉及钯(0)的CC键催化的插入苄C(SP 3) H键,因此提供到2-亚甲基-2,3-二氢苯并呋喃,在其转变为苯并呋喃的高效访问用弱酸(例如,AcOH)和亲电试剂进行处理。炔氧基作为促进CH键官能化的指导基团。