Cleavage of 3-amino-o-carborane and its' N-derivatives by bases into the 3-amino-7,8-dicarbaundecaborate anion and its N-derivatives
摘要:
Cleavage of 3-amino-o-carborane by alcoholic alkali results in preferential elimination of the boron atom from position six of the polyhedron with the formation of a salt of 3-amino-7,8-dicarbaundecaborate and, to a smaller degree, to elimination of the boron bonded to the NH2 group, which leads to formation of a salt of 7,8-dicarbaundecaborate. Cleavage of 3-amino-o-carborane by piperidine is even more regioselective. Cleavage of N-derivatives of 3-amino-9-carborane by alcoholic alkali or piperidine is regiospecific, leading to salts of N-substituted 7,8-dicarbaundecaborates. 3-Ammonium-7,8-dicarbaundecaborate and a number of its N-derivatives were isolated in zwitterion form for the first time.
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