Oxazolidine synthesis by complementary stereospecific and stereoconvergent methods

Area of Science:

• Organic Chemistry
• Catalysis
• Asymmetric Synthesis

Background:

• 1,3-oxazolidines are important heterocyclic compounds with diverse applications.
• Developing efficient and stereoselective synthetic methods is crucial for accessing enantiopure oxazolidines.

Purpose of the Study:

• To report complementary stereospecific and stereoconvergent reactions for the enantioselective synthesis of 1,3-oxazolidines.
• To demonstrate catalyst control over the stereochemical outcome (cis- or trans-isomers).

Main Methods:

• Stereospecific reaction of enantioenriched butadiene monoxide with aryl imines using a rhodium catalyst.
• Enantioselective reaction of racemic butadiene monoxide with aryl imines using chiral palladium or nickel catalysts.

Main Results:

• The rhodium-catalyzed reaction proceeds with high stereosspecificity, yielding products with 99% enantiomeric excess (ee).
• Palladium or nickel catalysis provides enantioselective synthesis of 1,3-oxazolidines with up to 94% ee.
• Control over catalyst choice allows for the selective synthesis of either cis- or trans-1,3-oxazolidines.

Conclusions:

• Developed complementary catalytic strategies for enantioselective 1,3-oxazolidine synthesis.
• Demonstrated the utility of rhodium, palladium, and nickel catalysts in controlling stereochemistry.
• Provided access to enantiomerically enriched cis- and trans-1,3-oxazolidines.