903577-93-5Relevant academic research and scientific papers
Ring enlargement reactions of tetramic acid derivatives
Poschenrieder,Eckl,Stachel,Windt,Polborn
, p. 839 - 846 (2000)
The 4-hydroxypyridones 7 and 3-hydroxypyridones 8/9 (azagrevellins) were prepared by reaction of the pyrrolidinetrione 4 and diazoalkanes. The ring enlargement proceeded by anionotropic [1,2]-rearrangement introducing carbon between C-3 and C-4 or, to a l
