Electrooxidative α-hydroxymethylation of ketones with dimethylformamide as the carbon source
作者:Jin-Ming Zheng、Yi-Fei Li、Yi-Xiang Pan、Xiao-Dong Hu、Xiao-Xia Ye、Ren-Hao Li
DOI:10.1039/d3gc00144j
日期:——
An environmentally benign electrochemical approach has been developed for the α-hydroxymethylation of ketones using N,N-dimethylformamide as the carbon source for the construction of β-hydroxy ketones. This method does not require metal catalysts or chemical oxidants and proceeded smoothly at room temperature to demonstrate tolerance of a broad range of functional groups.
The cross-coupling reaction of α,β-unsaturated aldehydes with primary alcohols to give 2-hydroxymethyl ketones was achieved using RuHCl(CO)(PPh3)3 as a catalyst. This atom-economical reaction is likely to proceed via the hydroruthenation of α,β-unsaturated aldehydes followed by an aldol reaction of the resultant enolates with aldehydes to give α-formylated ketones, which undergo transfer hydrogenation
A high-boiling, fluorous-organic hybrid ether, F-626, was tested for use in thermal retro-aldol reactions and found to be an excellent reaction medium in view of the ease of separation from the product by fluorous/organic biphasic treatment. The recovered F-626 can be readily reused for subsequent runs.