Transition Metal Catalyzed Direct Amination of the Cage B(4)–H Bond in <i>o</i>-Carboranes: Synthesis of Tertiary, Secondary, and Primary <i>o</i>-Carboranyl Amines
作者:Hairong Lyu、Yangjian Quan、Zuowei Xie
DOI:10.1021/jacs.6b07086
日期:2016.10.5
catalyzed regioselective amination of the cage B(4)-H bond in o-carboranes has been achieved for the first time using O-benzoyl hydroxylamines or organic azides as the amination reagents, leading to the preparation of a series of tertiary and secondary carboranyl amines. Both amination reactions proceeded under mild conditions without the addition of any external oxidants. Hydrogenolysis of the resultant
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
Iron(III)-catalyzed aerobic oxidation for the synthesis of 1-benzoxazolyl-o-carboranes
作者:Ji Wu、Ke Cao、Cai-Yan Zhang、Xin-Yu Wen、Bo Li、Junxiao Yang
DOI:10.1016/j.jorganchem.2021.121881
日期:2021.7
A FeCl3 catalyzed tandem condensation/cyclization/aerobicoxidation process for synthesis of 1-benzoxazolyl-o-carboranes has been developed. The degradation of o-carborane in the presence of aza-/oxa-nucleophiles was completely suppressed, and a series of 1-benzoxazolyl-o-carboranes, 1-benzothiazolyl-o-carborane and 1-benzimidazolyl-o-carborane have been synthesized with good to excellent yields. This
Rhodium‐Catalyzed Regioselective Hydroxylation of Cage B−H Bonds of
<i>o</i>
‐Carboranes with O
<sub>2</sub>
or Air
作者:Hairong Lyu、Yangjian Quan、Zuowei Xie
DOI:10.1002/anie.201605880
日期:2016.9.19
A rhodium‐catalyzed hydroxylation of a cage B4−H bond in o‐carboranes with either O2 or air as the oxygen source is described, and serves as a new methodology for the regioselective generation of a series of 4‐OH‐o‐carboranes in a one‐pot process. The use of either O2 or air as both the oxidant and the oxygen source makes this protocol very environmentally friendly and practical.