M. Ishikura et al., A concise access to 6-azabicyclo[3.1.0] hexanes via high-pressure promotedcycloaddition reaction of azides to ABH, HETEROCYCLE, 53(7), 2000, pp. 1499-1504
Cycloaddition reaction of electron-deficient azides (5a, b) to 2-azabicyclo
[2.2.1]hept-5-en-3-one (ABH) (1) was accelerated by high-pressure, leading
to a mixture of regioisomeric triazolines (6) in good yields. Then, 6 were
in turn, through photolysis and ring opening sequences, converted to 6-azab
icyclo[3.1.0]-hexanes (8).