Dn. Butler et al., A 1,3-DIPOLAR CYCLOADDITION ROUTE TO 7-AZANORBORNANES - APPLICATION TO THE SYNTHESIS OF SYN-FACIAL N-BRIDGED POLYNORBORNANES, Synlett, (6), 1998, pp. 588
Aziridinocyclobutenes react with electron-deficient or ring-strained a
lkenes to produce 7-azanorbornenes in a novel 1,3-dipolar cycloadditio
n reaction suitable for BLOCK assembly protocols. Benzo-7-azanorbornad
iene and 7-heterobridged analogues react stereoselectively to produce
compounds with syn-facial orientation of their bridges.