Methylation of C(sp<sup>3</sup>)–H/C(sp<sup>2</sup>)–H Bonds with Methanol Catalyzed by Cobalt System
作者:Zhenghui Liu、Zhenzhen Yang、Xiaoxiao Yu、Hongye Zhang、Bo Yu、Yanfei Zhao、Zhimin Liu
DOI:10.1021/acs.orglett.7b02462
日期:2017.10.6
a commercially available Co salt, a tetradentate phosphine ligand P(CH2CH2PPh2)3(PP3), and a base (denoted as [Co]/PP3/base), is developed for the methylation of C(sp3)–H and C(sp2)-H bonds using methanol as a methylating reagent. The Co(BF4)2·6H2O/PP3/K2CO3 catalytic system showed high catalytic activity for the methylation of C–H bonds in aryl alkyl ketones, aryl acetonitriles, and indoles, with wide
一种高效的钴基催化体系,由市售的钴盐,四齿膦配体P(CH 2 CH 2 PPh 2)3(PP 3)和碱(表示为[Co] / PP 3 / base)组成),用于使用甲醇作为甲基化试剂对C(sp 3)–H和C(sp 2)-H键进行甲基化。Co(BF 4)2 ·6H 2 O / PP 3 / K 2 CO 3催化体系对芳烷基酮,芳基乙腈和吲哚中CH键的甲基化反应具有很高的催化活性,具有广泛的底物范围和良好的官能团耐受性,在100°C条件下获得的甲基取代产物的收率好至极好C。这种便宜,容易获得且高效的Co基催化体系在使用甲醇的甲基化反应中可能具有广阔的应用前景。