我们开发了一种实用的 KO t Bu 或 KOH 催化的苄基 C(sp 3 )–H 键与各种醇的有氧交叉脱氢偶联,利用分子氧作为唯一氧化剂。这种无过渡金属和化学氧化剂的方法可以实现苄基C(sp 3 )–H键的直接和选择性烷氧基化,特别是容易发生过度氧化的初级苄基C–H键。此外,有氧氧化C-H/O-H交叉偶联方法为在温和反应条件下构建具有高化学选择性的苄基醚提供了一条实用且可持续的途径。
Cu(OAc)<sub>2</sub>-catalyzed remote benzylic C(sp<sup>3</sup>)–H oxyfunctionalization for CO formation directed by the hindered para-hydroxyl group with ambient air as the terminal oxidant under ligand- and additive-free conditions
作者:Jian-An Jiang、Cheng Chen、Jian-Gang Huang、Hong-Wei Liu、Song Cao、Ya-Fei Ji
DOI:10.1039/c3gc41946k
日期:——
A hindered para-hydroxyl group-directed remotebenzylicC(sp3)–H oxyfunctionalization has been developed for the straightforward transformation of 2,6-disubstituted 4-cresols, 4-alkylphenols, 4-hydroxybenzyl alcohols and 4-hydroxybenzyl alkyl ethers into various aromatic carbonyl compounds. The ligand- and additive-free Cu(OAc)2-catalyzed atmospheric oxidation mediated by ethylene glycol unlocks a
Transition-metal-free access to benzyl ethers <i>via</i> aerobic cross-dehydrogenative coupling of benzylic C(sp<sup>3</sup>)–H bonds with alcohols
作者:Xiao Zhang、Wenjie Li、Yang Yu、Min Luo、Hua Bai、Lei Shi、Hao Li
DOI:10.1039/d3gc04070d
日期:——
cross-dehydrogenative coupling of benzylic C(sp3)–H bonds with various alcohols utilizing molecular oxygen as the sole oxidant. This transition-metal-free and chemical-oxidant-free methodology could enable direct and selective alkoxylation of benzylic C(sp3)–H bonds, especially the primary benzylic C–H bond, which is prone to undergo overoxidation. Moreover, the aerobic oxidative C–H/O–H cross-coupling
我们开发了一种实用的 KO t Bu 或 KOH 催化的苄基 C(sp 3 )–H 键与各种醇的有氧交叉脱氢偶联,利用分子氧作为唯一氧化剂。这种无过渡金属和化学氧化剂的方法可以实现苄基C(sp 3 )–H键的直接和选择性烷氧基化,特别是容易发生过度氧化的初级苄基C–H键。此外,有氧氧化C-H/O-H交叉偶联方法为在温和反应条件下构建具有高化学选择性的苄基醚提供了一条实用且可持续的途径。