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From the same journal

A green way to γ-lactams through a copper catalyzed ARGET-ATRC in ethanol and in the presence of ascorbic acid

Research output: Contribution to journalArticle

Author(s)

  • Roberto Casolari
  • Fulvia Felluga
  • Vincenzo Frenna
  • Franco Ghelfi
  • Ugo M. Pagnoni
  • Andrew F. Parsons
  • Domenico Spinelli

Department/unit(s)

Publication details

JournalTetrahedron
DatePublished - 14 Jan 2011
Issue number2
Volume67
Number of pages9
Pages (from-to)408-416
Original languageEnglish

Abstract

A 'green' ARGET-ATRC, for the CuCl[PMDETA] catalysed cyclo-isomerization of N-allyl-alpha-polychloroamides to gamma-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 degrees 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 alpha,beta-unsaturated-gamma-lactams from N-(2-chloroallyl)-alpha-polychloroamides, via a tandem process involving an ATRC and a reductive [1,2]-elimination. (C) 2010 Elsevier Ltd. All rights reserved.

    Research areas

  • Halocompounds, ATRC, gamma-Lactams, CuCl, Ascorbic acid, TRANSFER RADICAL POLYMERIZATION, ADDITION ATRA, FUNCTIONAL REARRANGEMENT, ORGANIC-SYNTHESIS, ELECTRON-TRANSFER, REDUCING AGENTS, CYCLIZATION REACTIONS, METHYL-METHACRYLATE, STEREOSELECTIVE-SYNTHESIS, DIRUTHENIUM AMIDINATE

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