Synthesis of Different Deuterated Carboxylic Acids from Unsaturated Acids Promoted by Samarium Diiodide and D2O
摘要:
An easy, and rapid reduction of the C=C bond of alpha,beta-unsaturated acids by means of samarium diiodide in the presence of D2O provides an efficient method for synthesizing 2,3-dideuterio acids. Starting from alka-2,4-dienoic acids, (E)-alpha,delta-dideuterio-betagamma-unsaturated acids are obtained, the new C=C bond being generated with complete diastereoselectivity. When H2O is used instead of D2O, saturated carboxylic acids and (E)-beta,gamma-unsaturated acids are isolated. A mechanism to explain each synthesis has been proposed.
A synthetically benign deuterium atom transfer (DAT) deuteration of electron-deficient alkenes has been achieved. This DAT protocol realized higher functional group (FG) tolerance and chemoselectivity than the existing method, and allowed access to complex deuterated compounds including a heavy drug and deuterium-labeled amino acids.
已经实现了缺电子烯烃的合成良性氘原子转移 (DAT) 氘化。该 DAT 协议实现了比现有方法更高的官能团 (FG) 耐受性和化学选择性,并允许获得复杂的氘化化合物,包括重药物和氘标记的氨基酸。
Somasekharan, K. N.; Kiefer, Edgar F., Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1988, vol. 27, # 1-12, p. 29 - 37
作者:Somasekharan, K. N.、Kiefer, Edgar F.
DOI:——
日期:——
Chemical‐Reductant‐Free Electrochemical Deuteration Reaction using Deuterium Oxide
作者:Xu Liu、Ruoyu Liu、Jiaxing Qiu、Xu Cheng、Guigen Li
DOI:10.1002/anie.202005765
日期:2020.8.10
We report a method for the electrochemical deuteration of α,β‐unsaturated carbonyl compounds under catalyst‐ and external‐reductant‐free conditions, with deuteration rates as high as 99 % and yields up to 91 % in 2 h. The use of graphite felt for both the cathode and the anode was key to ensuring chemoselectivity and high deuterium incorporation under neutral conditions without the need for an external
An easy, and rapid reduction of the C=C bond of alpha,beta-unsaturated acids by means of samarium diiodide in the presence of D2O provides an efficient method for synthesizing 2,3-dideuterio acids. Starting from alka-2,4-dienoic acids, (E)-alpha,delta-dideuterio-betagamma-unsaturated acids are obtained, the new C=C bond being generated with complete diastereoselectivity. When H2O is used instead of D2O, saturated carboxylic acids and (E)-beta,gamma-unsaturated acids are isolated. A mechanism to explain each synthesis has been proposed.