Synthesis of 2,2′-Diaminobischromones Using a Modified Procedure for the Rearrangement of 5-(2-Hydroxyphenyl)isoxazole to 2-Aminochromone
作者:Chandrakanta Bandyopadhyay、Tarun Ghosh、Satyajit Saha
DOI:10.1055/s-2005-869965
日期:——
A modified procedure for the rearrangement of 5-(2-hydroxyphenyl)isoxazoles 6a-e to 2-aminochromones 8a-e was developed and this procedure was utilised in the synthesis of hitherto unreported bischromones 3a-c. The isoxazoles 6a-e were prepared regioselectively from aminovinylketones 5.
Rearrangements of N-alkyl-/aryl-nitrones derived from 4-oxo-4H-1-benzopyran-3-carboxaldehyde––a solvent-dependent process
作者:Tarun Ghosh、Chandrakanta Bandyopadhyay
DOI:10.1016/j.tetlet.2004.06.033
日期:2004.8
C-(4-Oxo-4H-1-benzopyran-3-yl)-N-alkyl-/aryl-nitrones derived from 4-oxo-4H-1-benzopyran-3-carboxaldehyde, rearrange to 2-alkyl-/aryl-amino-3-formylchromone and/or 3-(alkyl-/aryl-aminomethylene)chroman-2,4-dione depending upon the reaction medium. 3-(Alkylaminomethylene)chroman-2,4-dione has been utilized in the synthesis of 1-benzopyrano[3,4-d]isoxazole-4-one. (C) 2004 Elsevier Ltd. All rights reserved.
Moorty,S.R. et al., Indian Journal of Chemistry, 1973, vol. 11, p. 854 - 856