Lawesson’s Reagent and Microwaves: A New Efficient Access to Benzoxazoles and Benzothiazoles from Carboxylic Acids under Solvent-Free Conditions
作者:Julio Seijas、M. Vázquez-Tato、M. Carballido-Reboredo、José Crecente-Campo、Lucía Romar-López
DOI:10.1055/s-2007-967994
日期:2007.2
Lawesson's reagent acts as an efficient promoter in the solvent-free microwave-assisted synthesis of 2-substituted benzoxazoles from carboxylic acids and 2-aminophenol, and thus, constitutes a general synthetic method for these compounds. This new application of Lawesson's reagent is valid also for benzothiazoles with very high efficiency level. A variety of aromatic, heteroaromatic and aliphatic carboxylic
Lawesson 试剂在无溶剂微波辅助下由羧酸和 2-氨基苯酚合成 2-取代苯并恶唑的过程中充当有效促进剂,因此构成了这些化合物的通用合成方法。Lawesson 试剂的这种新应用也适用于具有非常高效率水平的苯并噻唑。各种芳香族、杂芳香族和脂肪族羧酸在所开发的条件下反应,在所有情况下都具有良好的产率。硫代苯甲酸是在没有溶剂的情况下微波辅助合成 2-苯基苯并恶唑和 2-苯基苯并噻唑的良好替代品。