Cycloaddition Chemistry of 2-Vinyl-Substituted Indoles and Related Heteroaromatic Systems
作者:Albert Padwa、Stephen M. Lynch、José M. Mejía-Oneto、Hongjun Zhang
DOI:10.1021/jo047834a
日期:2005.3.1
The intramolecular Diels−Alder cycloaddition reaction (IMDAF) of several N-phenylsulfonylindolyl-substituted furanyl carbamates containing a tethered π-bond on the indole ring were examined as an approach to the iboga alkaloid catharanthine. Only in the case where the tethered π-bond contained two carbomethoxy groups did the [4 + 2]-cycloaddition occur. Push−pull dipoles generated from the Rh(II)-catalyzed
Tandem Cyclization-Cycloaddition Reaction of Rhodium Carbenoids as an Approach to the Aspidosperma Alkaloids
作者:Albert Padwa、Alan T. Price
DOI:10.1021/jo00125a007
日期:1995.10
Synthesis of the Pentacyclic Skeleton of the Aspidosperma Alkaloids Using Rhodium Carbenoids as Reactive Intermediates
作者:Albert Padwa、Alan T. Price
DOI:10.1021/jo971424n
日期:1998.2.1
derivatives was treated with rhodium(II) acetate. Attack of the amido carbonyl oxygen at the resultant rhodiumcarbenoid center produced a transient push-pull carbonyl ylide dipole which underwent an intramolecular dipolar cycloaddition reaction. A related annulation sequence was used to prepare the pentacyclic skeleton of the aspidosperma family of alkaloids. Synthesis of the required diazo imide was
Rhodium Carbenoid Induced Cycloadditions of Diazo Ketoimides Across Indolyl π-Bonds
作者:Albert Padwa、Xuechuan Hong、José Mejía-Oneto、Stefan France
DOI:10.1055/s-2007-967982
日期:2007.3
chloride and alkyl 2-diazo-3-(3-substituted-2-oxopiperidin-3-yl)-3-oxopropanoates were treated with rhodium(II) acetate. Attack of the imido carbonyl oxygen at the resultant rhodium carbenoid center produced a transient push-pull carbonyl ylide dipole which underwent an intramoleculardipolarcycloaddition across the indole π-bond. In most cases, the resulting cycloadduct is the consequence of ENDO-cycloaddition