Palladium‐Catalyzed Regiodivergent Synthesis of 1,3‐Dienyl and Allyl Esters from Propargyl Esters

• Published in: Angewandte Chemie International Edition Vol. 61; no. 23; pp. e202203835 - n/a
• Main Authors: Dai, Mengfu, Sun, Zhimin, Chen, Liang‐An
• Format: Journal Article
• Language: English
• Published: Germany Wiley Subscription Services, Inc 07-06-2022
• Edition: International ed. in English
• Subjects: 1,3-Dienes; Catalysis; Catalysts; Chemical synthesis; Esters; Palladium; Palladium Catalysis; Propargyl Esters; Regiodivergent Catalysis; Regioselectivity; Stereoselectivity; Propargyl Esters; Palladium Catalysis; Regioselectivity; 1,3-Dienes; Regiodivergent Catalysis
• ISSN: 1433-7851; 1521-3773
• DOI: 10.1002/anie.202203835

Catalyst‐controlled regiodivergent catalysis is a vital chemical tool that allows efficient access to large collections of structurally diverse molecules from a common precursor but remains a challenge. We report a catalyst‐controlled, tunable, and predictable regiodivergency in transforming the internal aliphatic propargyl esters into diverse libraries of highly substituted 1,3‐dienyl and allyl products by Pd‐catalysis. Depending on the ligand employed, the palladium catalyst can involve two typical approaches: electrophilic palladium catalysis and a sequential oxidative addition–reductive elimination pathway. This regiodivergent protocol endows facile access to four regioisomers with high regio‐ and stereoselectivity from the common propargyl esters. In terms of synthetic utility, a notable feature of this protocol is amenable to structural diversification of bioactive relevant molecules, enabling rapid assembly of many useful structural analogs of pharmaceutical candidates.
An unprecedented catalyst‐controlled regiodivergent strategy has been developed that allows efficient access to structurally diverse 1,3‐dienyl and allyl esters from common propargyl esters with high regio‐ and stereochemical outcomes. The ligand backbone is crucial for the regioselectivity pattern, enabling the palladium catalyst to involve electrophilic metal catalysis or sequential oxidative addition–reductive elimination pathway.