Functionalized Arylzinc Compounds in Ethereal Solvent: Direct Synthesis from Aryl Iodides and Zinc Powder and Application to Pd-Catalyzed Reaction with Allylic Halides
作者:Ryo Ikegami、Akiko Koresawa、Takanori Shibata、Kentaro Takagi
DOI:10.1021/jo026746s
日期:2003.3.1
Arylzinc compounds, ArZnX, were conveniently prepared in high yields by the reaction of zinc powder with aryl iodides, which contain electron-withdrawing groups such as CO(2)CH(3), CN, Br, or CF(3) at the ortho-, meta- or para-position, or electron-donating groups such as CH(3), OCH(3), or H, at 70 degrees C in THF, at 100 degrees C, or at 130 degrees C in diglyme, respectively. Pd(dba)(2) exhibited
通过锌粉与芳基碘化物的反应可方便地以高收率制备芳基锌化合物ArZnX,芳基碘化物在邻位含有吸电子基团,例如CO(2)CH(3),CN,Br或CF(3) -在70摄氏度的THF,100摄氏度或130摄氏度的二甘醇二甲醚中的间位或对位或电子给体基团,例如CH(3),OCH(3)或H 。Pd(dba)(2)对这些ArZnX醚溶液与烯丙基卤化物的交叉偶联显示出优异的高效催化作用,从而以高收率提供了多种官能化的烯丙基苯。反应大部分在0mol%,5mol%催化剂存在下进行5-30min。通过两个反应将芳基碘化物转化为烯丙基苯可以在一个罐中完成。