Reactions of
<scp>4‐Nitrophenyl</scp>
5‐substituted Furan‐2‐carboxylates with
<scp>
R
<sub>2</sub>
NH
</scp>
/
<scp>
R
<sub>2</sub>
NH
<sub>2</sub>
</scp>
<sup>+</sup>
in 20 mol%
<scp>DMSO</scp>
(aq): Effect of Aryl Group on the
<scp>Acyl‐Transfer</scp>
Reaction
作者:Sang Yong Pyun、Kyu Cheol Paik、Man So Han、Bong Rae Cho
DOI:10.1002/bkcs.12296
日期:2021.7
Reactions of 4-nitrophenyl 2-furoates (1a–e) with R2NH/R2NH2+ in 20 mol% DMSO(aq) have been studied. The reactions produced aminolysis products and exhibited second-order kinetics. The Brönsted plots were linear with βnuc values of 0.75–0.89, which remained nearly the same for all 5-furyl substituents. The rate data showed excellent correlations on the Yukawa-Tsuno plots with ρ(x) = 0.72–1.1, and r = 0
已经研究了 4-硝基苯基 2-糠酸酯 ( 1a–e ) 与 R 2 NH/R 2 NH 2 +在 20 mol% DMSO(aq) 中的反应。反应产生氨解产物并表现出二级动力学。Brönsted 图呈线性,β nuc值为 0.75-0.89,所有 5-呋喃基取代基几乎保持相同。速率数据在 Yukawa-Tsuno 图上显示出极好的相关性 ,分别为ρ( x ) = 0.72–1.1 和r = 0.55–0.95 。ρ 值增加,r值随着亲核试剂的增强而降低,表明 CO 键处的电子密度增加,共振贡献减少。结果已被解释为添加-消除机制,其中第二步是 rds。通过与 ArC(O)OC 6 H 4 -4-NO 2 (Ar = Ph, thienyl)的数据进行比较,评估了芳基对酰基转移反应的影响。