Synthesis of substituted γ- and δ-lactams based on titanocene(<scp>iii</scp>)-catalysed radical cyclisations of trichloroacetamides
作者:Faïza Diaba、Enrique Gómez-Bengoa、Juan M. Cuerva、Josep Bonjoch、José Justicia
DOI:10.1039/c6ra12180b
日期:——
A new procedure for the synthesis of γ- and δ-lactams based on a Cp2TiCl-catalysed cyclisation of trichloroacetamides under mild reaction conditions is reported. Theoretical studies supported the observed regioselectivity in the cyclisations and the mechanism involved in the dehalogenation process.
The synthesis of 2-azabicyclo[3.3.1]nonanes using a radical cyclization process as the piperidine ring-forming step is described. The reaction involves 1-(carbamoyl)-dichloromethyl radicals which react intramolecularly with simple or activated alkenes, such as enol acetates or silyl enol ethers.