Efficient Synthesis of 2-Substituted Benzoxazoles via Beckmann Rearrangement of 2-Hydroxyaryl Ketoximes Using Diethyl Chlorophosphate
作者:A. Sardarian、Z. Shahsavari-Fard
DOI:10.1055/s-2008-1072767
日期:2008.5
An efficient method for synthesis of 2-substituted benz-oxazoles has been developed using diethyl chlorophosphate. 2-Hydroxyaryl ketoximes are efficiently converted to benzoxazoles by heating in the presence of diethyl chlorophosphate via Beckmann rearrangement of ketoxime in excellent yields. This method avoids the use of strong acids, harsh conditions, and long reaction times.
The use of Ph3P/DDQ offers a novel, neutral and highlyefficient method for the efficient conversion of 2-hydroxyaryl aldoximes and ketoximes to 1,2-benzisoxazoles in excellent yields at room temperature.
Ph 3 P / DDQ的使用提供了一种新颖,中性和高效的方法,可在室温下以优异的收率将2-羟基芳基醛肟和酮肟有效转化为1,2-苯并恶唑。
v.Auwers; Lechner; Bundesmann, Chemische Berichte, 1925, vol. 58, p. 41
作者:v.Auwers、Lechner、Bundesmann
DOI:——
日期:——
Acid Catalyzed Direct-Amidation–Dehydrocyclization of 2-Hydroxy-acetophenones to Benzoxazoles by a One-Pot Sustainable Synthesis