Catalytic cross-dimerisation giving reactive borylated polyenes toward cross-coupling.

Area of Science:

• Organic Chemistry
• Catalysis
• Synthetic Chemistry

Background:

• Conjugated polyenes are crucial structural motifs in various natural products and materials.
• Efficient synthesis of functionalized polyenes remains a challenge in organic chemistry.
• Borylated organic compounds offer versatile reactivity in cross-coupling reactions.

Purpose of the Study:

• To develop a novel synthetic route to borylated conjugated trienes and skipped dienes.
• To demonstrate the utility of these borylated compounds as building blocks for polyene synthesis.
• To establish a one-pot procedure for sequential cross-dimerization and cross-coupling reactions.

Main Methods:

• Ruthenium (Ru)-catalyzed cross-dimerization of alkynyl-, dienyl-, and vinyl boronates.
• Palladium (Pd)-catalyzed cross-coupling reactions.
• One-pot synthesis strategies without the need for protecting groups.

Main Results:

• Successful preparation of a series of borylated conjugated trienes and skipped dienes.
• Demonstration of the utility of these compounds as synthetic intermediates.
• Efficient one-pot synthesis of polyene substructures achieved through sequential catalysis.

Conclusions:

• The developed Ru-catalyzed cross-dimerization provides access to valuable borylated polyene precursors.
• Subsequent Pd-catalyzed cross-coupling enables the efficient construction of complex polyene architectures in a single operation.
• This methodology offers a powerful tool for the synthesis of polyene-containing molecules.