... Tetrahedron Letters. ... In this Letter, we report our results on the synthesis of bridged 1,4-diazepanes 7–10 (Scheme 1). Retrosynthetic analysis of 7–10 leads to N-benzyl azabicyclo[n.3.1]alkanones 11–14 as convenient starting ... (b) R. Adams (Ed.), Organic Reactions, Vol. ...