Synthesis of 3-Fluoropyridines via Photoredox-Mediated Coupling of α,α-Difluoro-β-iodoketones with Silyl Enol Ethers
作者:Sofya I. Scherbinina、Oleg V. Fedorov、Vitalij V. Levin、Vladimir A. Kokorekin、Marina I. Struchkova、Alexander D. Dilman
DOI:10.1021/acs.joc.7b02467
日期:2017.12.15
A method for the synthesis of diversely substituted 3-fluoropyridines from two ketone components is described. The reaction involves photoredox coupling of α,α-difluoro-β-iodoketones with silyl enol ethers catalyzed by fac-Ir(ppy)3 under blue LED irradiation with subsequent one-pot condensation with ammonium acetate. Based on cyclic voltammetry studies, it was determined that α,α-difluoro-β-iodoketones
描述了一种由两种酮组分合成不同取代的3-氟吡啶的方法。该反应涉及在蓝色LED照射下,fac -Ir(ppy)3催化α,α-二氟-β-碘酮与甲硅烷基烯醇醚的光氧化还原偶联,随后与乙酸铵进行一锅缩合。根据循环伏安法研究,确定与2,2,2-三氟-1-碘乙烷相比,α,α-二氟-β-碘酮的还原明显容易,这可能归因于羰基的影响。