Metal-free in situ sp3, sp2, and sp C–H functionalization and oxidative cross coupling with benzamidines hydrochloride: a promising approach for the synthesis of α-ketoimides
I<sub>2</sub>-Catalyzed Oxidative Cross-Coupling of Methyl Ketones and Benzamidines Hydrochloride: A Facile Access to α-Ketoimides
作者:Xia Wu、Qinghe Gao、Shan Liu、Anxin Wu
DOI:10.1021/ol501029w
日期:2014.6.6
An iodine-catalyzed oxidative cross-coupling of C–H/N–H has been demonstrated. This simple and efficient approach constructed α-ketoimides in good to excellent yields from methyl ketones and benzamidines hydrochloride under metal-free and peroxide-free conditions. This synthetic strategy was achieved via an in situ iodination-based oxidative coupling pathway.
We streamline the synthesis of ketones and esters with multiple α-heteroatoms by sequentially generating two heteroatom metal carbenes using a designer I(III)/S(VI) reagent. This strategy enables the selective addition of oxygen, nitrogen, sulfur, or carbon atoms, incorporating up to three functional groups at the α-carbon of carbonyls in a single step.
我们通过使用 I (III) /S (VI)设计试剂依次生成两个杂原子金属卡宾,简化了具有多个 α-杂原子的酮和酯的合成。该策略能够选择性地添加氧、氮、硫或碳原子,一步即可在羰基的 α-碳上结合多达三个官能团。
The Oxidative Cross-Coupling of Benzonitriles with Multiform Substrates: A Domino Strategy Inspired Easy Access to α-Ketoimides
An iodine-promoted highly efficient convergent synthesis of alpha-ketoimides from multiform substrates and benzonitriles through oxidative imidation reaction is described. This domino oxidative imidation process involves cleavage of C-H bond and construction of C-O and C-N bonds. This method could be a powerful compliment to the existing methods owing to its use of abundantly available starting materials and reagents.