Iodosobenzene-Mediated α-Acyloxylation of 1,3-Dicarbonyl Compounds with Carboxylic Acids and Insight into the Reaction Mechanism
作者:Chitturi Bhujanga Rao、Jingwen Yuan、Qian Zhang、Rui Zhang、Ning Zhang、Jianyong Fang、Dewen Dong
DOI:10.1021/acs.joc.8b00114
日期:2018.3.2
A highly efficient direct α-acyloxylation of 1,3-dicarbonyl compounds with carboxylic acids mediated by hypervalent iodine reagent is presented. Treatment of a variety of 1,3-dicarbonyl compounds with carboxylic acids in the presence of iodosobenzene provides the corresponding α-acyloxylated products in good to excellent yields. The mechanistic investigation by means of NMR spectroscopy reveals that
提出了一种由高价碘试剂介导的高效1,3-二羰基化合物与羧酸的直接α-酰氧基化反应。在碘代苯的存在下用羧酸处理各种1,3-二羰基化合物可提供相应的α-酰氧基化产物,收率良好至极佳。通过NMR光谱的机理研究表明,原位生成的苯基碘双羧酸盐被证明是α-酰氧基化的关键中间体,并且反应物和氧化剂的装载顺序对于活性物质的产生是至关重要的。温和的反应条件,宽泛的底物范围,短的反应时间,良好的收率,高的化学选择性,出色的官能团耐受性和无金属催化剂的转化,使得该酰氧基化成为重要的合成方案。