The regiospecific 1,3‐dipolarcycloaddition reaction of 1,2‐dihydropyridines 1 with cyanogen azide 2 afford 2,7‐diazabieyelo[4.1.0]hept‐4‐enes 3 in quantitative yield. Catalytic hydrogenation of 3 gives rise to a tautomeric mixture of piperidylidene‐2‐cyanamides 5 in quantitative yield. Alternatively treatment of 3 with a suspension of alumina oxide in chloroform yields 1,2,5,6‐tetrahydropyridylidenes 4 which are also quantitatively reduced to 5.
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