Exploration of the Synthetic Potential of Electrophilic Trifluoromethylthiolating and Difluoromethylthiolating Reagents
作者:Jingjing Zhang、Jin-Dong Yang、Hanliang Zheng、Xiao-Song Xue、Herbert Mayr、Jin-Pei Cheng
DOI:10.1002/anie.201805859
日期:2018.9.24
and Lu's reagent 1 a being the most reactive and Billard's reagent 1 h being the least reactive electrophile. While the observed electrophilic reactivities (E) of the amido‐derived trifluoromethylthiolating reagents correlate well with the calculated Gibbs energies for heterolytic cleavage of the X−SCF3 bonds (Tt+DA), the cumol‐derived reagents 1 f and 1 g are more reactive than expected from the thermodynamics
某些三氟甲基硫醇化试剂和二氟甲基硫醇化试剂的亲电参数(E)通过线性自由能关系log k 2 =遵循与具有已知亲核性参数(N,s N) 的一系列烯胺和碳负离子的反应动力学来确定。s N(N + E)。这些试剂的亲电反应性覆盖17个数量级,其中沉和陆氏试剂1a最具活性,比拉德氏试剂1 h是反应性最低的亲电试剂。酰胺基三氟甲基硫醇化试剂的亲电反应性(E)与X-SCF 3键(Tt + DA)的杂合裂解的吉布斯能的计算值有很好的相关性,而枯草酚源试剂1 f和1 g则更高反应性比os裂解的热力学预期的要高。在这项工作中得到的三/二氟甲基硫醇化试剂的E参数为它们在合成中的使用提供了有序的原理。