Value-added chemicals from biomass-derived furans: radical functionalisations of 5-chloromethylfurfural (CMF) by metal-free ATRA reactions
作者:Rajesh Dasi、Daniel Schmidhuber、Lisa Marie Gronbach、Julia Rehbein、Malte Brasholz
DOI:10.1039/d1ob00013f
日期:——
functionalised by radical transformations of its benzylic chloromethyl group. We report here the first examples of these radical reactions by way of metal-free, triethylborane/oxygen-induced atom transfer radical addition (ATRA) reactions between CMF and styrenes, which proceed with high yield and selectivity. The key intermediate, the 2-formyl-5-furfuryl radical derived from CMF, and its radical addition reactions
生物质衍生的5-氯甲基糠醛(CMF)是众所周知的基于碳水化合物的平台化学5-羟甲基糠醛(HMF)的同类产品,可通过对其苄基氯甲基进行自由基转化来有效地使其功能化。我们在这里报告了这些自由基反应的第一个例子,这些反应是通过CMF和苯乙烯之间无金属的三乙基硼烷/氧诱导的原子转移自由基加成(ATRA)反应进行的,该反应以高收率和选择性进行。研究了关键中间体,即CMF衍生的2-甲酰基-5-糠基及其自由基加成反应的电子结构,即基于NBO ansatz的自旋密度分布和前沿分子轨道以及加成的激活势垒使用DFT和后HF方法的步骤。