Iridium-Catalyzed ortho-Selective C–H Silylation of Aromatic Compounds Directed toward the Synthesis of π-Conjugated Molecules with Lewis Acid–Base Interaction
摘要:
We successfully developed an iridium-catalyzed ortho-selective C-H silylation of aromatic compounds. The reaction exhibited a wide substrate scope, and a variety of pi-conjugated molecules were synthesized in good to excellent yields, even in gram scale. Several silyl groups could also be introduced into the products. The experimental results indicated that the regioselectivity could be controlled by a Lewis acid-base interaction between the Lewis acidic silicon atoms of fluorinated hydrosilanes and the Lewis basic nitrogen atoms of aromatic compounds.
2‐dioxaborolan‐2‐yl)diphenylsilane produced fluorosilylated 2‐phenylpyridines in good to excellent yields under palladium catalysis. This reaction is the first example of CH fluorosilylation. Single‐crystal X‐ray structure analysis revealed a Lewis acid–base interaction between the silicon and nitrogen atoms, and the obtained fluorosilylated products are silafluorene equivalents. The fluorosilylated products
Iridium-Catalyzed <i>ortho</i>-Selective C–H Silylation of Aromatic Compounds Directed toward the Synthesis of π-Conjugated Molecules with Lewis Acid–Base Interaction
作者:Takayuki Wakaki、Motomu Kanai、Yoichiro Kuninobu
DOI:10.1021/acs.orglett.5b00529
日期:2015.4.3
We successfully developed an iridium-catalyzed ortho-selective C-H silylation of aromatic compounds. The reaction exhibited a wide substrate scope, and a variety of pi-conjugated molecules were synthesized in good to excellent yields, even in gram scale. Several silyl groups could also be introduced into the products. The experimental results indicated that the regioselectivity could be controlled by a Lewis acid-base interaction between the Lewis acidic silicon atoms of fluorinated hydrosilanes and the Lewis basic nitrogen atoms of aromatic compounds.