Ring strain-promoted allylic transposition of cyclic silyl ethers

Area of Science:

• Organic Chemistry
• Catalysis
• Ring Strain Chemistry

Background:

• Medium-sized rings (8-12 members) often possess significant ring strain.
• Ring strain can be harnessed to drive chemical transformations.
• Allylic C-O bond transposition is a valuable synthetic tool.

Purpose of the Study:

• To investigate the catalytic effect of rhenium oxide on medium-sized rings.
• To explore the regioselectivity of allylic C-O bond transposition.
• To achieve ring contraction of cyclic silyl ethers.

Main Methods:

• Utilized rhenium oxide as a catalyst.
• Subjected eight-membered cyclic silyl ethers to reaction conditions.
• Analyzed the products for structural confirmation and regioselectivity.

Main Results:

• Demonstrated regioselective allylic transposition of a C-O bond.
• Achieved ring contraction of eight-membered cyclic silyl ethers.
• Formation of six-membered siloxacycles was observed.

Conclusions:

• Relief of ring strain in medium-sized rings can be effectively catalyzed.
• Rhenium oxide promotes a specific allylic transposition pathway.
• This methodology provides a route to synthesize six-membered siloxacycles from larger rings.