Eighteen novel norcantharidinderivatives, which were substituted by chromone ring, were synthesized in a single step by the [3 + 2] 1,3‐dipolar cycloaddition reaction with three oximes in the presence of chloramine‐T when compared with the conventional method.
Rearrangement of 3-aminoisoxazolo[4,5-c]coumarins into 2-aminooxazolo[4,5-c]coumarins mediated by carboxylic acid anhydrides
作者:Vyacheslav Ya. Sosnovskikh、Vladimir S. Moshkin、Mikhail I. Kodess
DOI:10.1016/j.mencom.2010.06.009
日期:2010.7
Reactions of 3-amino-4H-chromeno[3,4-d]isoxazol-4-ones with acetic and trifluoroacetic anhydrides gave the corresponding acetyl derivatives, which were rearranged into 2-amino-4H-chromeno[3,4-d][1,3]oxazol-4-ones by heating in DMSO solution.
Ghosh, Chandra Kanta; Tewari, Nimai; Bandyopadhyay, Chandrakanta, Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 1983, vol. 22, # 12, p. 1200 - 1204