A cyanoborohydride‐promoted radicalcyclization methodology has been developed to access α‐chlorolactams in a simple and efficient way using NaBH3CN and trichloroacetamides easily available from allylic and homoallylic secondary amines. This methodology allowed the synthesis of a library of α‐chlorolactams (mono‐ and bicyclic), which were tested for herbicidal activity, trans‐3‐chloro‐4‐methyl‐1‐(
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.