Computational and experimental structure–reactivity relationships: evidence for a side reaction in Alpine-Borane reductions of d-benzaldehydes
作者:Hui Zhu、N. Soledad Reyes、Matthew P. Meyer
DOI:10.1016/j.tetlet.2009.09.109
日期:2009.12
borabicyclo[3.3.1]nonane (Alpine-Borane). This is likely because of the extreme size disparity of groups on either side of the carbonyl. Here, we present a structure-reactivity study whereby the reductions of variably substituted d-benzaldehydes are explored using highly sensitive measures for enantiomeric excess and relative reactivity. These results are compared to the relative rates predicted from
据报道,B-异op基樟脑基-9-硼环[3.3.1]壬烷(Alpine-Borane)可降低d-苯甲醛的立体选择性,接近100%。这可能是由于羰基两侧的基团的尺寸差异极大。在这里,我们提出了一种结构反应性研究,其中使用对映异构体过量和相对反应性的高度敏感的措施,探索了可变取代的d-苯甲醛的减少量。将这些结果与从密度泛函计算预测的相对速率进行比较。结果表明,2,6-二取代通过经由高山-硼烷,9-硼环[3.3.1]壬烷的脱氢硼化产物的非选择性还原而不利地影响立体选择性。