Compound 4

N-(tert-Butyl)-N-(1-mesityl-5,7-dimethyl-1H-benzo[c]borol-2(3H)-yl)-4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-amine

From: Facile scission of isonitrile carbon–nitrogen triple bond using a diborane(4) reagent