Efficient synthesis of 2H & 13C labeled benzaldehydes via regio-selective formylation
作者:Sobhana B. Boga、Abdul B. Alhassan、David Hesk
DOI:10.1016/j.tetlet.2014.06.053
日期:2014.8
for the synthesis of natural products and pharmaceutical drugs. Herein we report a general synthetic methodology for the synthesis of highly functionalized 2H and 13Clabeled benzaldehydes in transfer of isotopic purity >99% via regio-selective formylation. Regio-selective deprotonation of substituted benzene 1 with LDA/n-BuLi at −78 °C and treatment with DMF-d7 or EtO-13CHO led to the synthesis of 2-deutero-1
苯甲醛是合成有机化学中的重要基石,在合成天然产物和药物方面具有广泛的应用。本文中,我们报告了通过区域选择性甲酰化,以高于99%的同位素纯度转移合成高度官能化的2 H和13 C标记的苯甲醛的一般合成方法。在-78°C下用LDA / n -BuLi对取代的苯1进行区域选择性去质子化,并用DMF- d 7或EtO- 13处理CHO导致以中等至良好的产率合成了2-氘1,3-二取代的苯甲醛2/4。所描述的合成方法代表了一种简单而通用的途径,用于官能化的甲酰氘化,tri化的13 C和14 C标记的苯甲醛。
Phosphorescence Spectra of Two Rotational Isomers of<i>m</i>-Fluorobenzaldehyde
Phosphorescence spectra of m-fluorobenzaldehyde and its aldehyde deuterated derivative have been observed in the vapor phase at room temperature and in a methylcyclohexane matrix at 4.2K. Paired band systems were detected for the vapor phase and for each of the two different crystallographic phases, α- and β-phases, and were attributed to two rotational isomers of the aldehyde group. Variable intensity
Laser flash photolysis study of the effects of substituents, solvents, and quenchers on the triplet state of benzaldehydes. Hydrogen/deuterium exchange following quenching by water-d2