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Formal Carbene Insertion into C−O or C−N Bond: An Efficient Strategy for the Synthesis of 2‐Substituted 2H‐Chromene Derivatives from Chromene Acetals or Hemiaminal Ethers.
- Source :
-
Advanced Synthesis & Catalysis . 7/4/2018, Vol. 360 Issue 13, p2446-2452. 7p. - Publication Year :
- 2018
-
Abstract
- Abstract: We report the palladium/Brønsted acid co‐catalyzed formal insertion of carbene into the C−O or C−N bond of 2H‐chromene acetals or hemiaminal ethers. This transformation was initiated by the Brønsted acid‐promoted cleavage of the C−O or C−N bond, followed by modification of the leaving alcohol or amino fragments with palladium carbenes, and reassembly of the modified fragments. A variety of C‐2 functionalized 2H‐chromene derivatives were obtained in moderate yield (43∼75%) with good to excellent diastereoselectivities (up to >95:5 dr) under mild conditions. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 16154150
- Volume :
- 360
- Issue :
- 13
- Database :
- Academic Search Index
- Journal :
- Advanced Synthesis & Catalysis
- Publication Type :
- Academic Journal
- Accession number :
- 130505438
- Full Text :
- https://doi.org/10.1002/adsc.201800179