Carboryne (1,2-dehydro-o-carborane), in situ generated from the precursor 1-iodo-2-lithiocarborane, reacted with alkylbenzenes to give two regioisomers of the [4 + 2] cycloadducts as the major products in moderate to good yields, in which the steric factors play an important role in the regioselectivity. Minor products derived from benzylic C–H insertion reaction, annulation reaction, tandem [4 + 2]
Light-promoted copper-catalyzed cage C-arylation of <i>o</i>-carboranes: facile synthesis of 1-aryl-<i>o</i>-carboranes and <i>o</i>-carborane-fused cyclics
作者:Hangcheng Ni、Zhenpin Lu、Zuowei Xie
DOI:10.1039/d0nj02029j
日期:——
Light-promoted, coppercatalyzed cage C–H arylation of o-carboranes with aryl halides has been achieved, leading to the facile synthesis of a variety of 1-aryl-o-carboranes and o-carborane-fused cyclics. This method has the following features: (1) using o-carboranes instead of prefunctionalized iodocarboranes as starting materials; (2) employing earth abundant copper as a catalyst; and (3) room-temperature