Tandem Sequence of Phenol Oxidation and Intramolecular Addition as a Method in Building Heterocycles
作者:Maxim O. Ratnikov、Linda E. Farkas、Michael P. Doyle
DOI:10.1021/jo302002j
日期:2012.11.16
A tandem phenol oxidation–Michael addition furnishing oxo- and -aza-heterocycles has been developed. Dirhodium caprolactamate [Rh2(cap)4] catalyzed oxidation by T-HYDRO of phenols with alcohols, ketones, amides, carboxylic acids, and N-Boc protected amines tethered to their 4-position afforded 4-(tert-butylperoxy)cyclohexa-2,5-dienones that undergo Brønsted acid catalyzedintramolecular Michael addition
Desymmetrization of Cyclohexadienones via Brønsted Acid-Catalyzed Enantioselective Oxo-Michael Reaction
作者:Qing Gu、Zi-Qiang Rong、Chao Zheng、Shu-Li You
DOI:10.1021/ja100207s
日期:2010.3.31
Desymmetrization of cyclohexadienones via enantioselective oxo-Michael reaction catalyzed by chiral phosphoric acid to afford highly enantioenriched 1,4-dioxane and tetrahydrofuran derivatives in excellent yields has been realized. The newly established methodology allows the facile enantioselective synthesis of cleroindicins C, D, and F.
Oxidative De-aromatization ofpara-Alkyl Phenols intopara-Peroxyquinols andpara-Quinols Mediated by Oxone as a Source of Singlet Oxygen
作者:M. Carmen Carreño、Marcos González-López、Antonio Urbano
DOI:10.1002/anie.200504605
日期:2006.4.21
Direct Stereocontrolled Synthesis of Polyoxygenated Hydrobenzofurans and Hydrobenzopyrans from <i>p</i>-Peroxy Quinols
作者:Silvia Barradas、M. Carmen Carreño、Marcos González-López、Alfonso Latorre、Antonio Urbano
DOI:10.1021/ol702236e
日期:2007.11.1
tandem catalytic process on p-peroxy quinols with hydroxy alkyl chains at C-4 allowed the one-pot synthesis of hydrobenzofuran and hydrobenzopyran tricyclic epoxides. In this transformation, two new cycles and four new stereogenic centers are created in a highly stereocontrolled manner. The usefulness of the strategy is illustrated with the first total synthesis and structural revision of natural product
Spirofused and Annulated 1,2,4‐Trioxepane‐, 1,2,4‐Trioxocane‐, and 1,2,4‐Trioxonane‐Cyclohexadienones: Cyclic Peroxides with Unusual Ring Conformation Dynamics
hydroperoxides. This reaction can also be performed with photochemically generated singletoxygen. However, other characteristic singletoxygenreactions do not proceed with caroate. The initially formed hydroperoxides cyclize in the presence of a Lewis acid catalyst based on boron, indium, or iron to give spiroannulated peroxides. These exhibit restricted ring inversion whereas larger nine‐membered‐ring peroxides