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Access to Optically Active 7-Membered Rings by a 2-Step Synthetic Sequence: Cu-Catalyzed Stereoselective Cyclopropanation of Branched 1,3-Dienes/Rh-Catalyzed Stereoconvergent [5 + 2] Cycloaddition

Published inACS Catalysis, vol. 10, no. 16, p. 9604-9611
Publication date2020
Abstract

We report a 2-step cyclopropanation/cycloaddition catalytic sequence that provides access to optically active 7-membered rings with a carboxyl-bearing tertiary stereocenter. In the first step, the Cu-catalyzed cyclopropanation of branched dienes generates vinylcyclopropanes in high yields, regioselectivity and enantioselectivity, albeit in modest cis/trans diastereoselectivity. The stereoconvergent nature of the subsequent Rh-catalyzed [5 + 2] cycloaddition with alkynes overrides this apparent limitation and affords preferentially one 7-membered ring out of the 8 or 16 possible stereoisomers that can be theoretically generated. The final regioselectivity and enantioselectivity are high in the majority of cases. The method is versatile and tolerates a broad range of functional groups.

Keywords
  • Copper catalysis
  • Rhodium catalysis
  • Cyclopropanation
  • [5 + 2] cycloaddition
  • 7-membered carbocycles
Research group
Citation (ISO format)
GARBO, Michele et al. Access to Optically Active 7-Membered Rings by a 2-Step Synthetic Sequence: Cu-Catalyzed Stereoselective Cyclopropanation of Branched 1,3-Dienes/Rh-Catalyzed Stereoconvergent [5 + 2] Cycloaddition. In: ACS Catalysis, 2020, vol. 10, n° 16, p. 9604–9611. doi: 10.1021/acscatal.0c02956
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ISSN of the journal2155-5435
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