A novel method for the metal-free synthesis of amides from thioamides based on visible-light photoredox catalysis and in an air atmosphere is reported. Natural pigment chlorophyll is used as a photosensitizer to generate singlet molecular oxygen 1O2, which is involved in the aerobic desulfurization of thioamides. The protocol provides amides in good yields at room temperature under mild conditions
报道了一种基于可见光光氧化还原催化和空气气氛的硫代酰胺无金属合成酰胺的新方法。天然色素叶绿素作为光敏剂产生单线态分子氧1 O 2,参与硫代酰胺的好氧脱硫。该协议在温和条件下在室温下以良好的收率提供酰胺。在实验结果的基础上,提出了一种合理的光氧化还原机制。
Visible-Light Carbon Nitride-Catalyzed Aerobic Cyclization of Thiobenzanilides under Ambient Air Conditions
Roe,A.; Tucker,W.P., Journal of Heterocyclic Chemistry, 1965, vol. 2, p. 148 - 151
作者:Roe,A.、Tucker,W.P.
DOI:——
日期:——
An efficient route to 3-aminoindazoles and 3-amino-7-azaindazoles
作者:Michael J. Burke、Brian M. Trantow
DOI:10.1016/j.tetlet.2008.05.100
日期:2008.7
A non-acidic procedure for the preparation of 3-aminoindazoles and 3-amino-7-azaindazoles from 2-fluoroaryl carboxylic acids is reported. The synthesis starts from readily available starting materials and uses mild and practical reaction conditions in a three-step overall procedure. Products were isolated for a number of examples, but yields varied significantly depending on electronic nature of the substituents. (c) 2008 Elsevier Ltd. All rights reserved.