Efficient 5-exo-trig atom-transfer radical cyclisation of 13 unsaturated α-halogeno amides mediated by Cu0 (copper wire) with tripyridylmethanimine ligand (TPMA; 1 mol-%) in a mixed solvent of EtOAc/EtOH (3:1) is reported (89–98 %), with recycling of the copper wire. A substantial improvement in conversion and selectivity was obtained when Na2CO3 (5 mol-%)was added to the reaction mixture. The Cu0 acts as a supplementary activator and reducing agent in a SARA-ATRC process. The protocol was extended to the cyclisation onto alkynes and the formation of -lactams, although these reactions gave lower yields (35–76 %).
Cu° promoted cyclization of unsaturated alpha-halogeno amides to give beta- and gamma-lactams / Clark, A. J.; Duckmanton, J. N.; Felluga, F.; Gennaro, A.; Ghelfi, F.; Hardiman, J. R. D.; Isse, A. A.; Manferdini, C.; Spinelli., D.. - In: EUROPEAN JOURNAL OF ORGANIC CHEMISTRY. - ISSN 1099-0690. - 2016:14(2016), pp. 2479-2491.
Data di pubblicazione: | 2016 |
Data di prima pubblicazione: | 26-apr-2016 |
Titolo: | Cu° promoted cyclization of unsaturated alpha-halogeno amides to give beta- and gamma-lactams. |
Autore/i: | Clark, A. J.; Duckmanton, J. N.; Felluga, F.; Gennaro, A.; Ghelfi, F.; Hardiman, J. R. D.; Isse, A. A.; Manferdini, C.; Spinelli., D. |
Autore/i UNIMORE: | |
Digital Object Identifier (DOI): | http://dx.doi.org/10.1002/ejoc.201600249 |
Rivista: | |
Volume: | 2016 |
Fascicolo: | 14 |
Pagina iniziale: | 2479 |
Pagina finale: | 2491 |
Codice identificativo ISI: | WOS:000377250900015 |
Codice identificativo Scopus: | 2-s2.0-84964670232 |
Citazione: | Cu° promoted cyclization of unsaturated alpha-halogeno amides to give beta- and gamma-lactams / Clark, A. J.; Duckmanton, J. N.; Felluga, F.; Gennaro, A.; Ghelfi, F.; Hardiman, J. R. D.; Isse, A. A.; Manferdini, C.; Spinelli., D.. - In: EUROPEAN JOURNAL OF ORGANIC CHEMISTRY. - ISSN 1099-0690. - 2016:14(2016), pp. 2479-2491. |
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