Epoxidation of (E,E)-Cinnamylideneacetophenones with Hydrogen Peroxide and Iodosylbenzene with Salen-MnIII as the Catalyst
作者:Clementina M. M. Santos、Artur M. S. Silva、José A. S. Cavaleiro、Albert Lévai、Tamás Patonay
DOI:10.1002/ejoc.200700123
日期:2007.6
(E,E)-Cinnamylideneacetophenones 3a–j were epoxidized under mild conditions with Jacobsen's catalyst 4 and hydrogenperoxide or iodosylbenzene as oxidants. γ,δ-Monoepoxides and a diastereomeric mixture of α,β:γ,δ-diepoxides were obtained in each case, and only the α,β-monoepoxide of 4-nitrocinnamylideneacetophenone (3d) was isolated. The presence of a methyl group in the vinylic moiety of substrates
Photochemical Study of Chalconoid-like Compounds: Synthesis of 4-Flavanoids
作者:Ramesh C. Kamboj、Dinesh Kumar、Surinder Berar、Geeta Sharma、Rita Arora
DOI:10.1002/jhet.1583
日期:2014.7
The photo‐irradiation of chalconoid‐like compounds; (2E,4E)‐1‐(2‐hydroxyaryl)‐4‐methyl‐5‐phenylpenta‐2,4‐dien‐1‐ones to 4‐flavanoids in solution phase has been described. The molecular scaffold of the probed substrates is responsive to intramolecular cyclization as well as cis‐trans isomerizations and photoproducts corresponding to both of reactions have been realized also. The formation of photoproducts