75501-54-1Relevant articles and documents
Formal total synthesis of (+)-diepoxin σ
Wipf, Peter,Jung, Jae-Kyu
, p. 6319 - 6337 (2007/10/03)
The highly oxygenated antifungal anticancer natural product (±)-diepoxin σ was prepared in 10 steps and in 15% overall yield from O-methylnaphthazarin. Highlights of the synthetic work include an Ullmann coupling and a possibly biomimetic oxidative spirocyclization for the introduction of the naphthalene ketal as well as the use of a retro-Diels-Alder reaction to unmask the reactive enone moiety in the naphthoquinone bisepoxide ring system. A novel highly bulky chiral binaphthol ligand was developed for a boron-mediated Diels-Alder reaction that constitutes a formal asymmetric total synthesis of (+)-diepoxin σ.
Photochemical Versus Aluminium Chloride-Catalyzed Fries Rearrangement of Aryl Hydrogen Succinates. Synthesis of 2(3H)-Furanones
Fillol, Luis,Martinez-Utrilla, Roberto,Miranda, Miguel A.,Morera, Isabel M.
, p. 863 - 870 (2007/10/02)
The photochemical and aluminium chloride-catalyzed Fries rearrangement of a series of aryl hydrogen succinates 3 a-f to the corresponding 4-oxoacids 1 a-f are compared.Both approaches are complementary: the photochemical process is more general and becomes the method of choice for the succinoylation of phenols supporting alkoxy or hydroxy substituents, while the classical rearrangement is superior in the presence of alkyl or halogen substituents.These results are applied to the preparation of the 2(3H)-furanones 2 a-f. - Keywords: Fries rearrangement; Photo-Fries rearrangement; Aryl hydrogen succinates; 4-Oxoacids; 2(3H)-Furanones.
Indirect Hidroquinone Succinoylation via a Photo-Fries Rearrangement. Application to the Synthesis of Enol Lactones
Martinez-Utrilla, Roberto,Miranda, Miguel Angel
, p. 2281 - 2282 (2007/10/02)
A photo-Fries rearrangement of hydroquinone succinates is the key step that allows the preparation of some γ-aryl enol lactones by dehydration of the corresponding aroyl propinoic acids.