Highly Enantioselective Iridium(I)-Catalyzed Hydrocarbonation of Alkenes: A Versatile Approach to Heterocyclic Systems Bearing Quaternary Stereocenters.
Highly Enantioselective Iridium(I)-Catalyzed Hydrocarbonation of Alkenes: A Versatile Approach to Heterocyclic Systems Bearing Quaternary Stereocenters.
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DOI:
10.1002/anie.202105776
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发表时间:
2021-08-23
期刊:
影响因子:
--
通讯作者:
López F
中科院分区:
文献类型:
--
作者:
Arribas A;Calvelo M;Fernández DF;Rodrigues CAB;Mascareñas JL;López F
We report a versatile, highly enantioselective intramolecular hydrocarbonation reaction that provides a direct access to heteropolycyclic systems bearing chiral quaternary carbon stereocenters. The method, which relies on an iridium(I)/bisphosphine chiral catalyst, is particularly efficient for the synthesis of five‐, six‐ and seven‐membered fused indole and pyrrole products, bearing one and two stereocenters, with enantiomeric excesses of up to >99 %. DFT computational studies allowed to obtain a detailed mechanistic profile and identify a cluster of weak non‐covalent interactions as key factors to control the enantioselectivity. We report an enantioselective Ir‐catalyzed hydrocarbonation towards pyrrole and indole polycyclic scaffolds featuring five‐, six‐ or seven‐membered rings, with tertiary and all‐carbon quaternary stereocenters. The process can be coupled with the desymmetrization of prochiral centers to obtain pyrrole‐ and indole‐fused scaffolds with either vicinal or skipped stereocenters. DFT studies shed light on the mechanism and key stereodetermining factors.
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