Visible-Light-Promoted Photocatalytic B−C Coupling via a Boron-Centered Carboranyl Radical: Facile Synthesis of B(3)-Arylated<i>o</i>-Carboranes
作者:Da Zhao、Zuowei Xie
DOI:10.1002/anie.201511251
日期:2016.2.24
A visible‐light‐mediated in situ generation of a boron‐centered carboranylradical (o‐C2B10H11.) has been described. With eosin Y as a photoredox catalyst, 3‐diazonium‐o‐carborane tetrafluoroborate [3‐N2‐o‐C2B10H11][BF4] was converted into the corresponding boron‐centered carboranylradical intermediate, which can undergo efficient electrophilic substitution reaction with a wide range of (hetero)arenes
1,3-Dehydro-<i>o</i>-Carborane: Generation and Reaction with Arenes
作者:Da Zhao、Jiji Zhang、Zuowei Xie
DOI:10.1002/anie.201405023
日期:2014.8.4
(o‐carboryne), a three‐dimensional relative of benzyne, has been used as a synthon for generating a wide range of cage, carbon‐functionalized carboranes over the past 20 years. However, the selective B functionalization of the cage still represents a challenging task. Disclosed herein is the first example of 1,3‐dehydro‐o‐carborane featuring a cage CB bond having multiple bonding characters, and is successfully
Visible-Light-Induced Palladium-Catalyzed Cross-Coupling of Iodocarboranes with (Hetero)Arenes
作者:Shimeng Li、Jie Zhang、Zuowei Xie
DOI:10.1021/acs.orglett.2c02648
日期:2022.10.21
radicals at the B3, B4, and B9 sites via a visible-light-promoted palladium(0)/palladium(I) pathway using readily available iodo-o-carboranes as the starting materials. The electrophilicities of these hypervalent boron-centered radicals decrease in the following order: B3 > B4 > B9. They are useful intermediates for the preparation of a family of cage B-(hetero)arylated o-carboranes at ambient temperature