Palladium(0)-Catalyzed Remote Decarboxylative Allylation and Base-Mediated 1,3-Migration

Area of Science:

• Organic Chemistry
• Catalysis
• Synthetic Methodology

Background:

• Palladium-catalyzed reactions are crucial in modern organic synthesis.
• Tandem reactions offer efficiency by performing multiple transformations in one pot.
• Cyclohexadienones are versatile building blocks in organic chemistry.

Purpose of the Study:

• To report a novel palladium(0)-catalyzed decarboxylative oxa-Michael addition/remote α-allylation/1,3-migration.
• To investigate an unconventional intramolecular rearrangement of prochiral allyl carbonate-tethered cyclohexadienones.
• To establish the generality and scalability of this new synthetic method.

Main Methods:

• Utilizing palladium(0) catalysis for decarboxylative transformations.
• Employing base-mediated retro-Michael ring-opening (β-elimination).
• Performing syn-selective oxa-Michael addition on enone functionalities.

Main Results:

• Achieved good yields for the described intramolecular rearrangement.
• Demonstrated the reaction's applicability with various prochiral allyl carbonate-tethered cyclohexadienone substrates.
• Successfully performed the reaction on a gram scale, indicating scalability.

Conclusions:

• The reported palladium-catalyzed reaction provides an efficient and novel route for complex molecule synthesis.
• The tandem decarboxylative allylation is triggered by a base-mediated retro-Michael reaction followed by oxa-Michael addition.
• The method shows broad substrate scope and scalability, highlighting its potential utility in organic synthesis.