Bovino MT, Liwosz TW, Kendel NE, Miller Y, Tyminska N, Zurek E, Chemler SR. Enantioselective copper-catalyzed carboetherification of unactivated alkenes.
Angew Chem Int Ed Engl 2014;
53:6383-7. [PMID:
24798697 DOI:
10.1002/anie.201402462]
[Citation(s) in RCA: 79] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2014] [Revised: 03/25/2014] [Indexed: 11/06/2022]
Abstract
Chiral saturated oxygen heterocycles are important components of bioactive compounds. Cyclization of alcohols onto pendant alkenes is a direct route to their synthesis, but few catalytic enantioselective methods enabling cyclization onto unactivated alkenes exist. Herein reported is a highly efficient copper-catalyzed cyclization of γ-unsaturated pentenols which terminates in C-C bond formation, a net alkene carboetherification. Both intra- and intermolecular C-C bond formations are demonstrated, thus yielding functionalized chiral tetrahydrofurans as well as fused-ring and bridged-ring oxabicyclic products. Transition-state calculations support a cis-oxycupration stereochemistry-determining step.
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