Ruthenium catalysed C-H bond borylation.

Area of Science:

• Organometallic Chemistry
• Catalysis
• Organic Synthesis

Background:

• Ruthenium complexes are versatile catalysts in organic synthesis.
• C-H activation and borylation are key transformations for functionalizing organic molecules.
• Developing efficient catalytic systems for selective borylation is an ongoing challenge.

Purpose of the Study:

• To synthesize novel phenylindenyldihydridosilyl ruthenium complexes.
• To investigate the catalytic activity of these complexes in the ortho-selective borylation of pyridyl substrates.
• To explore a new ruthenium(IV)-catalyzed C-H activation borylation/functionalization reaction.

Main Methods:

• Reaction of tertiary silanes with [RuCl(3-phenylindenyl)(PPh3)2].
• Catalytic testing of the synthesized ruthenium complexes for borylation reactions.
• Optimization of reaction conditions to achieve high selectivity and yield.

Main Results:

• Easily prepared phenylindenyldihydridosilyl ruthenium complexes were synthesized.
• The [RuH2(3-phenylindenyl)(SiEt3)] complex demonstrated high efficiency (1.5 mol%) in ortho-selective pyridyl borylation, achieving yields up to 90%.
• A novel ruthenium(IV)-catalyzed C-H activation borylation/functionalization reaction was successfully developed.

Conclusions:

• Novel ruthenium complexes can be readily prepared.
• The developed catalytic system enables highly efficient and selective ortho-borylation of pyridyl substrates.
• This study presents a new pathway for C-H activation borylation/functionalization using low ruthenium catalyst loadings.