Catalyst-free photo-induced aerobic radical synthesis of lactams from <i>N</i>-alkenyl trichloroacetamides in 2-methyltetrahydrofuran as the radical initiator under violet light
作者:Faïza Diaba、Gisela Trenchs
DOI:10.1039/d3ob01804k
日期:——
The first violet light-mediated synthesis of γ- and δ-lactams from N-alkenyl trichloroacetamides is reported in tetrahydrofuran or 2-methyltetrahydrofuran alone. These catalyst and additive-free reactions are achieved with non-anhydrous solvents and under an air atmosphere where the solvent serves as the radical initiator.
Translocation versus cyclisation in radicals derived from N-3-alkenyl trichloroacetamides
作者:M. Luisa Marin、Ramon J. Zaragoza、Miguel A. Miranda、Faïza Diaba、Josep Bonjoch
DOI:10.1039/c0ob01228a
日期:——
Under radical reaction conditions, two different and competitive reaction pathways were observed for N-(α-methylbenzyl)trichloroacetamides with a N-3-cyclohexenyl substituent: 1,4-hydrogen translocation and radical addition to a double bond. However, for radicals with an acyclic alkenyl side chain, the direct cyclisation process was exclusively observed. The dichotomy between translocation and direct radical cyclisation in these substrates has been theoretically studied using density functional theory (DFT) methods at the B3LYP/6-31G** computational level.