Volume 61, Issue 1 e202112288
Communication
Free to Read

Accessing Unsymmetrically Linked Heterocycles through Stereoselective Palladium-Catalyzed Domino Cyclization

Ramon Arora

Ramon Arora

Davenport Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, M5S 3H6 Canada

Search for more papers by this author
Dr. José F. Rodríguez

Dr. José F. Rodríguez

Davenport Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, M5S 3H6 Canada

Search for more papers by this author
Dr. Andrew Whyte

Dr. Andrew Whyte

Davenport Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, M5S 3H6 Canada

Search for more papers by this author
Prof. Mark Lautens

Corresponding Author

Prof. Mark Lautens

Davenport Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, M5S 3H6 Canada

Search for more papers by this author
First published: 05 November 2021
Citations: 33

Graphical Abstract

Solving alkynes of problems with palladium. A palladium-catalyzed domino cyclization of alkyne-tethered carbamoyl chlorides and aryl iodides with alkyne-tethered aryl nucleophiles is reported. This methodology unsymmetrically links heterocycles along a tetrasubstituted olefin with >20:1 E/Z selectivity and up to 96 % yield.

Abstract

A palladium-catalyzed strategy is presented to synthesize unsymmetrically linked heterocycles within stereoselective tetrasubstituted olefins. This reaction is proposed to occur via a vinyl-PdII intermediate capable of initiating the cyclization of various alkyne-tethered nucleophiles. Products are formed in up to 96 % yield and excellent stereoselectivities are obtained using low catalyst loadings. This transformation was scalable up to 1 mmol and mechanistic studies suggest a syn-carbopalladation of the carbamoyl chloride followed by PdII-catalyzed cyclization of alkyne-tethered nucleophiles.

The full text of this article hosted at iucr.org is unavailable due to technical difficulties.