Ir-Catalyzed Selective B(3)-H Amination of <i>o</i>-Carboranes with NH<sub>3</sub>
作者:Yik Ki Au、Jie Zhang、Yangjian Quan、Zuowei Xie
DOI:10.1021/jacs.1c00593
日期:2021.3.24
Ammonia gas, NH3, is a cheap and widely used industrial feedstock, which has received tremendous research interests in its functionalization. This work reports a breakthrough in catalytic selective cage B(3)-H amination of o-carboranes with NH3 via Ir-catalyzed B-H/N-H dehydrocoupling, offering convenient and efficient access to a series of 3-NH2-o-carborane derivatives in moderate to high isolated
Synthesis of σ-(o-carboran-9-yl)- and σ-(m-carboran-9-yl)-π-cyclopentadienyldicarbonyliron and their rearrangement in reactions with bromine to π-(o-carboran-9-yl)cyclopentadienyl- and π-(m-carboran-9-yl)cyclopentadienyl-dicarbonylironbromides, respectively
with bromine, undergo rearrangement with the cleavage of the BFe σ-bond, involving migration of the 9-o- and 9-m-carboranyl groups into the cyclopentadienyl ring, to give π-(o-carboran-9-yl)cyclopentadienyl- and π-(m-carboran-9-yl)cyclopentadienyl-dicarbonyliron bromides, respectively. A simple method to obtain these acids by the oxidation of 9-alkyl-o- and 9-alkyl-m-carboranes with CrO3 in CH3COOH
Pd-catalyzed selective tetrafunctionalization of diiodo-<i>o</i>-carboranes
作者:Yixiu Ge、Zaozao Qiu、Zuowei Xie
DOI:10.1039/d1cc03449a
日期:——
A palladium-catalyzed highly selective tetrafunctionalization of 3,6-I2-o-carborane and 4,7-I2-o-carborane has been developed, leading to the preparation of 3,6-dialkenyl-4,11-R2-o-carboranes and 4,7-dialkenyl-5,11-R2-o-carboranes (R = alkyl, allyl and aryl) in moderate to excellent yields. This represents a new strategy for selective synthesis of polyfunctionalized o-carborane derivatives via a one-pot
钯催化的 3,6-I 2 - o -carborane 和 4,7-I 2 - o -carborane 的高选择性四官能化已被开发,导致制备 3,6-dialkenyl-4,11-R 2 - o -carboranes 和 4,7-dialkenyl-5,11-R 2 -o -carboranes (R = 烷基、烯丙基和芳基),产率中等至极好。这代表了一种通过一锅法选择性合成多官能化邻碳硼烷衍生物的新策略。
Transition Metal Catalyzed, Regioselective <i>B</i>
(4)-Halogenation and <i>B</i>
(4,5)-Diiodination of Cage B−H Bonds in <i>o</i>
-Carboranes
作者:Hairong Lyu、Yangjian Quan、Zuowei Xie
DOI:10.1002/chem.201703006
日期:2017.10.20
Access granted: Transition metal catalyzed, regioselective cage B(4)−H iodination, bromination, and chlorination as well as B(4,5)−H diiodination were achieved to grant access to a series of previously inaccessible B(4)-halogenated o-carboranes in a simple one-pot process (see scheme). Mono- and di-selectivity can be controlled by in situ removal of the carboxyl directing group.
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