A modular olefination reaction between aldehydes and diborylsilylmethide lithium salts

Area of Science:

• Organic Chemistry
• Organosilicon Chemistry
• Organoboron Chemistry

Background:

• Trisubstituted alkenes are important synthetic intermediates.
• Developing efficient methods for functionalizing alkenes is crucial in organic synthesis.

Purpose of the Study:

• To report a novel boron-Wittig reaction for synthesizing 1,1-silylborylated trisubstituted alkenes.
• To explore the synthesis of 1,1-silylborylated conjugated dienes and diynes.

Main Methods:

• The boron-Wittig reaction was employed using LiC(Bpin)2(SiMe3) and aldehydes.
• Condensation reactions of diborylsilylmethide lithium salts with α,β-unsaturated aldehydes were performed.

Main Results:

• Densely functionalised 1,1-silylborylated trisubstituted alkenes were successfully prepared.
• A direct synthetic pathway to 1,1-silylborylated conjugated dienes and diynes was established.

Conclusions:

• The described boron-Wittig reaction offers an efficient route to novel silylborylated compounds.
• This methodology expands the synthetic utility of organoboron and organosilicon reagents.