134922-67-1Relevant academic research and scientific papers
On the Reaction of N-Vinyliminophosphoranes. Part 16. A New Synthesis of 5H-Indenopyridines and 5H-Indenopyridin-5-ones
Nitta, Makoto,Ohnuma, Manami,Iino, Yukio
, p. 1115 - 1118 (2007/10/02)
Thermal reaction of tributyl(inden-3-ylimino)phosphorane with α,β-unsaturated ketones and aldehydes led to a Michael-type C-C bond formation and subsequent aza-Wittig reaction to give 5H-indeno(1,2-b)pyridines in good to modest yield.The products were oxidized conveniently by chromium trioxide and t-butyl hydroperoxide to give 5H-indenopyridin-5-ones, including the 4-azafluorenone alkaloid onychine.
