Journal
TETRAHEDRON
Volume 69, Issue 23, Pages 4517-4523Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tet.2013.04.039
Keywords
Natural product; Alkaloid; Samarium diiodide; Palladium catalysis; Amidine
Categories
Funding
- Ministry of Education, Culture, Sports, Science and Technology of Japan
- JSPS Research Fellowship for Young Scientists
- Grants-in-Aid for Scientific Research [23390004] Funding Source: KAKEN
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An intramolecular SmI2-mediated reductive cyclization of carbodiimides and unsaturated lactams was applied to functionalized substrates bearing tetrasubstituted olefins. The reaction afforded arylated spiro-2-iminoindolines in high yield. Although the stereochemistry of the product was different from the desired one, the optimized palladium-catalyzed aryl amidination realized the isomerization and C-N bond formation in a single step and resulted in efficient construction of pentacyclic core of perophoramidine synthetically equivalent to the Rainier's intermediate. (C) 2013 Elsevier Ltd. All rights reserved.
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