Metal-Free Oxidation/C(sp<sup>3</sup>)H Functionalization of Unactivated Alkynes Using Pyridine-<i>N</i>-Oxide as the External Oxidant
作者:Dian-Feng Chen、Zhi-Yong Han、Yu-Ping He、Jie Yu、Liu-Zhu Gong
DOI:10.1002/anie.201205062
日期:2012.12.3
3‐Dihydroquinolin‐4(1H)‐ones are obtained in moderate to good yields (40–84 %, see scheme) in a metal‐free oxidation/C(sp3)H functionalization of unactivated aryl alkynes. 2,6‐Dichloropyridine‐N‐oxide is used as an external oxidant. In the reaction, a Brønsted acid, not a metal, plays a key role in the triple CC bond activation.
外部你:2,3二氢喹啉-4(1 ħ) -酮在中度至良好的产率获得(40-84%,参见方案)在不含金属的氧化/ C(SP 3) ħ未活化的芳基的官能化炔烃。2,6-二氯吡啶-N-氧化物用作外部氧化剂。在反应中,布朗斯台德酸而不是金属在三键C CC键活化中起关键作用。