Naruta, Yoshinori published the artcileCopper-catalyzed double cyclization reaction of azidoquinones: one-step synthesis of dihydropyrroloindoloquinones and related quinolinoquinones, Recommanded Product: Copper(II) ethylacetoacetate, the publication is Journal of Organic Chemistry (1987), 52(18), 3956-67, database is CAplus.
Intramol. cyclization of azido(pentadienyl)quinone I (R = H) has been examined in the presence of metal salts, e.g., MLn (M = Cu, Mn, Co, etc.; L = acetylacetonato). Copper or CuL2 exhibited the highest catalytic activity both to the decomposition of the azide and to the formation of the corresponding dihydropyrroloindoloquinone II (R = H) which was obtained in 58% yield in one step. The related azido(hexadienyl)quinones gave the corresponding quinolinoquinone derivatives in moderate yields. Thus, pyrolysis of hexadienylquinone derivative I (R = Me) in benzene in the presence of CuL2 afforded 27% quinolinoquinone. The double cyclization reaction proceeds with extremely high regio- and stereoselectivity, and the generality was established. Quinonoid structures and the presence of a conjugated dienyl side chain at the proximal position to an azide group are essential for the completion of this double cyclization reaction. The role of the copper catalyst to the cyclization reaction is also discussed.
Journal of Organic Chemistry published new progress about 14284-06-1. 14284-06-1 belongs to copper-catalyst, auxiliary class Copper, name is Copper(II) ethylacetoacetate, and the molecular formula is 0, Recommanded Product: Copper(II) ethylacetoacetate.
Referemce:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4660968/,
Special Issue “Fundamentals and Applications of Copper-Based Catalysts”