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
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
作者:Graebe、Feer
DOI:——
日期:——
Xanthones in Heterocyclic Synthesis. An Efficient Route for the Synthesis of C-3 o-Hydroxyaryl Substituted 1,2-Benzisoxazoles and Their N-Oxides, Potential Scaffolds for Angiotensin(II) Antagonist Hybrid Peptides
作者:Petros G. Tsoungas、Paul Cordopatis、Yiannis Gardikis、Constantinos Potamitis、Maria Zervou
DOI:10.3987/com-11-12162
日期:——
Regioselective substitution of xanthone and its nucleophilic cleavage allow the synthesis of C-3 o-hydroxyaryl substituted 1,2-benzisoxazoles or their N-oxides by cyclodehydration or oxidative cyclization of their corresponding ketoxime precursors, respectively. Molecular modeling analysis and H-1 NMR spectra indicate an intramolecular H-bonding engaging phenol OH and the isoxazole ring N atom.