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.
Schiff bases. Part I. Thermal decarboxylation of α-amino-acids in the presence of ketones
作者:A. F. Al-Sayyab、Alexander Lawson
DOI:10.1039/j39680000406
日期:——
A number of Schiff bases derived from α-amino-acids and hydroxy-substituted aromatic ketones have been prepared. Their infrared spectra suggest that their relative stability to hydrolysis as compared with those from ketones with no hydroxy-groups is due to hydrogen bonding. The thermal decomposition of α-amino-acids in the presence of ketones, followed by hydrolysis, produces the amines corresponding
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。
Preparation of 1,2-benzisoxazoles from salicylaldoximes via trichloroacetyl isocyanate
作者:Gerald Stokker
DOI:10.1021/jo00163a042
日期:1983.7
Graebe; Feer, Chemische Berichte, 1886, vol. 19, p. 2610