Palladium-catalyzed selective C–C bond cleavage and stereoselective alkenylation between cyclopropanol and 1, 3-diyne: one-step synthesis of diverse conjugated enynes. Issue 9 (15th February 2022)

• Record Type: Journal Article
• Authors: Pati, Bedadyuti Vedvyas; Ghosh, Asit; Yadav, Komal; Banjare, Shyam Kumar; Pandey, Shalini; Lourderaj, Upakarasamy; Ravikumar, Ponneri C.
• Is Part Of: Chemical science. Volume 13:Issue 9(2022)
• Page Start: 2692
• Page End: 2700
• Publication Date: 2022-02-15
• Subjects: Chemistry -- Periodicals; 540.5
• DOI: 10.1039/d1sc04780a
• Languages: English
• ISSNs: 2041-6520

Abstract

Abstract : Palladium-catalyzed tandem activation and functionalization of readily accessible cyclopropanols have been demonstrated to access valuable conjugated enynes from 1, 3-diynes with high stereo-selectivity. Abstract : The stereoselective synthesis of 1, 3-enynes from 1, 3-diynes is demonstrated by palladium-catalyzed selective C–C bond cleavage of cyclopropanol. Exclusive formation of mono-alkenylated adducts was achieved by eliminating the possibility of di-functionalization with high stereoselectivity. Indeed, this protocol worked very well with electronically and sterically diverse substrates. Several studies, including deuterium labeling experiments and intermolecular competitive experiments, were carried out to understand the mechanistic details. The atomic-level mechanism followed in the catalytic process was also validated using DFT calculations, and the rate-controlling states in the catalytic cycle were identified. Furthermore, preliminary mechanistic investigations with radical scavengers revealed the non-involvement of the radical pathway in this transformation.