作者:Ian J. S. Fairlamb、Ciara T. O'Brien、Zhenyang Lin、King Chung Lam
DOI:10.1039/b518232h
日期:——
The Sonogashira cross-coupling of 4,6-dichloro-2-pyrone with terminal acetylenes proceeds in good yields and high regioselectivity for the 6-position; dibenzylidene acetone (dba) type ligands play a non-innocent role in reactions mediated by Pd(dba)2/PPh3; theoretical studies indicate that C-6 oxidative addition is favoured both kinetically and thermodynamically.
4,6-二氯-2-吡喃酮与末端炔烃的Sonogashira交叉偶联反应以良好产率和高度区域选择性进行,产物优先在6位生成;二苄叉丙酮(dba)型配体在Pd(dba)2/PPh3催化的反应中发挥着非无辜作用;理论研究表明,C-6的氧化加成在动力学和热力学上都更有利。