期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 -, 期 -, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202304791
关键词
Alkylidenecyclobutanes; Boryl-Migration; Copper; DFT Calculations; Mechanism
Regioselective borylcupration of borylated skipped (Z)-dienes generates diborylated alkylcopper species that undergo intramolecular stereospecific B/Cu1,3-rearrangement by migration of Bpin moiety from C(sp(2)) to C(sp(3)). DFT mechanistic studies reveal that boryl migration occurs through the formation of a 4-membered boracycle intermediate with a moderate free-energy barrier. Additionally, the use of KOMe forms stable Lewis base adducts with Bpin moieties, blocking the reaction. Following the 1,3-boron shift, in situ electrophilic trapping enables selective C-H, C-C, and C-X bond formations, leading to cyclic functionalized alkylidenecyclohexanes or alkylidenecyclobutanes.
Regioselective borylcupration of borylated skipped (Z)-dienes generates diborylated alkylcopper species that are involved in an intramolecular stereospecific B/Cu 1,3-rearrangement by migration of Bpin moiety from C(sp(2)) to C(sp(3)). DFT mechanistic studies showed that boryl migration occurs through the formation of 4-membered boracycle intermediate with a moderate free-energy barrier. Moreover, the use of KOMe forms stable Lewis base adducts with Bpin moieties that blocks the reaction. Subsequently to the 1,3-boron shift, the in situ electrophilic trapping allows selective C-H, C-C and C-X bonds, followed by intramolecular cross coupling giving access to cyclic functionalized alkylidenecyclohexanes or alkylidenecyclobutanes.
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