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Radical cyclizations of di-, tri-and tetrapeptides containing N-2-bromobenzyl,N-methyl-substituted alanine or aspartic acid lead in good yields to a,b-unsaturated g-lactams. The overall cascade, relying on a hydrogen atom transfer-elimination strategy could serve as a way to incorporate a flat and rigid five-membered ring into the peptide framework.

Organo-tin compounds S 4800 Free Radical Addition and Cyclization Reactions of [2-(4-(S)-Isopropyl-2-oxazoline)-5-phenyl]dialkyltinHydrides. -The title hydrides (I) can be used for the preparation of alkyl and vinyl stannanes and piperidine derivatives. -(STEPIEN, A.; PETROSYAN, A.; WILK, M.; CMOCH, P.; RUPNICKI, L.; STALINSKI*, K.; Pol.