1,3-Dipolar cycloaddition of nitrones with 1,1-difluoroolefins gives rise to fluorinated isoxazolidines in 85% yield; subsequent Raney nickel reduction of the cycloadducts produces beta-lactams.
Selective synthesis of three product classes from imine and carboxylic acid precursors via direct imine acylation
作者:James A. Rossi-Ashton、Richard J. K. Taylor、William P. Unsworth
DOI:10.1039/c7ob02039b
日期:——
Three divergent Direct Imine Acylation (DIA) procedures are reported that allow the selective generation of δ-lactams, β-lactams and tetrahydropyrimidinones (via a novel three-component coupling) from imine and carboxylic acid precursors. All operate via initial N-acyliminium ion formation and diverge depending on the reaction conditions and nature of the substrates.