1264739-88-9Relevant articles and documents
A green way to γ-lactams through a copper catalyzed ARGET-ATRC in ethanol and in the presence of ascorbic acid
Casolari, Roberto,Felluga, Fulvia,Frenna, Vincenzo,Ghelfi, Franco,Pagnoni, Ugo M.,Parsons, Andrew F.,Spinelli, Domenico
, p. 408 - 416 (2011)
A 'green' ARGET-ATRC, for the CuCl[PMDETA] catalysed cyclo-isomerization of N-allyl-α-polychloroamides to γ-lactams is described. The process works efficiently (yields 78-96%), uses a bio-solvent, as ethanol, and exploits the reducing feature of ascorbic acid to limit, at a low level (2-4%), the amount of catalyst. To preserve the efficacy of the catalytic cycle, addition of Na2CO3 is essential, which quenches the HCl released during the CuCl[PMDETA] regeneration step. Profitable features of the process are: mild reaction temperatures (25-37 °C), relatively short reaction times (usually 5 h) and low solvent volumes (2 mmol of substrate/mL of ethanol). The method, upon stoichiometric adjustment, was also used for the synthesis of α,β-unsaturated-γ-lactams from N-(2-chloroallyl)-α- polychloroamides, via a tandem process involving an ATRC and a reductive [1,2]-elimination. Copyright
